JPH08184692A - Reactor fuel handling system and method - Google Patents

Abstract

(57) [Summary] [Purpose] Use a plurality of fuel handling carriages and a carriage equipped with a traverse carriage with a multi-stage telescopic mast on a track laid on the upper surface of the frame of the reactor pit and fuel rack. As a result, a fuel handling device for a nuclear reactor is provided which can significantly reduce the fuel handling period as compared with the prior art. [Structure] A track 14 is provided on the floor surface of a reactor pit 1 and an upper surface of a frame of a fuel rack 2, and a fuel handling carriage 64 can run on the track 14, and an operation floor above a reactor pressure vessel 100 is provided. A traveling carriage 73, which travels on the track 103, is equipped with a traverse carriage 79 to which a multi-stage telescopic mast 71 for raising and lowering the fuel 54 is attached.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for handling fuel in a nuclear reactor for speeding up fuel extraction and installation in a light water cooled nuclear reactor.

[0002]

2. Description of the Related Art For example, when handling fuel in a light water cooling reactor such as a boiling water reactor, a traveling carriage equipped with a traverse carriage equipped with a multi-stage telescopic mast is generally run above a reactor pressure vessel. After extending and grasping the fuel, the mast is contracted and the fuel is taken out. Then, the traveling carriage is moved to a predetermined position above the fuel rack of the fuel storage pool, the mast is extended to load the fuel into the storage rack, the fuel is removed, and then the mast is contracted, so that the traveling carriage is located above the reactor pressure vessel. To move. The same operation is repeated thereafter to take out a predetermined number of fuels. In addition, the reverse procedure is used to load the new fuel installed in the fuel rack into the reactor. These fuel handling operations are performed in water to reduce exposure.

[0003]

In handling fuel in a light water cooled reactor, the mast moves the fuel up and down from the reactor pressure vessel, moves from above the reactor pressure vessel to above the fuel rack, and moves the fuel to the fuel rack by the mast. Since the work such as lifting and lowering the fuel is performed, the moving distance of the fuel is very long.

Therefore, it takes a long time to handle the fuel, and the fuel handling work is a critical path for the regular inspection work of the nuclear reactor. The challenge is to shorten this fuel handling period in order to shorten the regular inspection period.

Conventionally, in order to shorten the fuel handling period, it has been attempted to raise and lower the telescopic mast at a high speed and use two traversing carriages and traveling carriages to increase the number of suspended fuels. Can be shortened by only a few percent, and it has not yet been released from the critical path of work during the shutdown inspection of the reactor.

The present invention has been made in view of the above circumstances, and a traverse provided with a plurality of fuel handling traveling carriages and a multistage telescopic mast is mounted on a track laid on the upper surface of a frame body of a reactor pit and a fuel rack. It is an object of the present invention to provide a fuel handling device and method for a nuclear reactor, which can significantly reduce the fuel handling period as compared with the prior art by using a traveling truck equipped with a truck.

[0007]

According to a first aspect of the present invention, a track is provided on a floor surface of a reactor pit and an upper surface of a frame of a fuel rack, and a fuel handling carriage can be run on the track. It is characterized in that a traveling carriage that travels on the orbit of the operation floor above the pressure vessel is equipped with a traverse carriage equipped with a multi-stage telescopic mast that raises and lowers the fuel.

According to a second aspect of the present invention, a plurality of first traversing carriages having a multi-stage telescopic mast are mounted on a first traveling carriage that travels on an orbit of an operation floor above the reactor pressure vessel, and a reactor pit. An orbit is installed from the floor to the gantry installed in the fuel storage pool, and part of the orbit is made parallel to the traveling carriage running on the orbit of the operation floor above the reactor pressure vessel, and the operation above the fuel storage pool It is characterized in that a plurality of second traversing carriages each having a multi-stage telescopic mast for raising and lowering are mounted on a second traveling carriage traveling on the track of the floor.

According to a third aspect of the present invention, in the fuel handling system for a nuclear reactor according to the first aspect, a circumferentially rotating fuel relay device is installed between the reactor pressure vessel and the core shroud. The fuel lifting device is provided on the floor surface of the reactor pit above the fuel storage pool side.

The invention of claim 4 is characterized in that an articulated arm device with a telescopic mast is provided in place of the fuel lifting device according to claim 3.

According to a fifth aspect of the present invention, a multistage telescopic mast is attached to the first and second traveling carriages that travel on the orbit of the operation floor above the fuel storage pool and on the orbit of the operation floor above the reactor pressure vessel. The first and second traverse carriages are mounted respectively, and a fuel relay device that rotates in the circumferential direction between the reactor pressure vessel and the core shroud is installed.

According to a sixth aspect of the present invention, the first traveling carriage having the multi-stage telescopic mast attached to the first traveling carriage that travels on the orbit of the operation floor above the reactor pressure vessel from above the fuel storage pool is mounted. Along with it, a second traverse truck equipped with a multi-stage telescopic mast is mounted on a second traveling carriage that runs in a direction perpendicular to the first traveling carriage across the reactor pressure vessel on a track laid on the floor of the reactor pit. However, a fuel relay device that rotates in the circumferential direction is installed between the reactor pressure vessel and the shroud.

The invention of claim 7 is characterized in that a plurality of second traveling vehicles according to claim 6 are installed.

The invention of claim 8 is characterized in that the second traveling vehicle according to claim 6 can travel in parallel with the first traveling vehicle.

The invention of claim 9 is characterized in that a plurality of articulated arm devices with telescopic masts are installed around the reactor core in place of the second traveling vehicle according to claim 6.

According to the tenth aspect of the present invention, a track is provided from the floor surface of the reactor pit to the upper surface of the frame of the fuel rack, and the fuel handling carriage can run on the track, and the operation floor above the reactor pressure vessel. The traverse vehicle that runs on the orbit of is equipped with a traverse vehicle equipped with a multi-stage telescopic mast, and is equipped with a fuel relay device that rotates in the circumferential direction between the reactor pressure vessel and the core shroud. It is characterized in that multiple articulated arm devices with telescopic masts for handling fuel are installed around the reactor core.

According to an eleventh aspect of the present invention, in the fuel handling system for a nuclear reactor according to the sixth aspect, the core shroud is replaced with a fuel relay device installed between the reactor pressure vessel and the core shroud and rotating in the circumferential direction. Is equipped with a fuel relay device installed on the upper surface of the.

According to a twelfth aspect of the present invention, in the fuel handling system for a nuclear reactor according to the sixth aspect, the link type telescopic arm is attached to the tip end mast of the multistage telescopic mast mounted on the traverse carriage that traverses on the second traveling carriage. It is characterized in that mounting and loading of fuel to the fuel relay device can be performed from the side surface, and that fuel can be taken out from the top surface.

According to a thirteenth aspect of the present invention, in the fuel handling device for a nuclear reactor according to the twelfth aspect, a fuel elevating device is provided on the floor surface of the reactor pit above the fuel storage pool side of the fuel relay device, and the fuel pit of the reactor pit is provided. A feature is that a track is provided on the floor surface and a gantry installed in the fuel storage pool, and a plurality of fuel handling traveling vehicles are mounted on these gantry to enable fuel handling.

According to a fourteenth aspect of the present invention, the first multi-stage telescopic mast having the link type telescopic mechanism mounted thereon is mounted on the first traveling carriage that travels on the orbit of the operation floor above the reactor pressure vessel. The first multi-stage telescopic mast equipped with a link type telescopic mechanism is mounted on the second traveling bogie that is capable of traversing the first traverse vehicle and travels on the track of the operation floor above the fuel storage pool. It is characterized in that a traverse carriage 2 can be traversed, and a fuel relay device that can rotate in the circumferential direction and takes out fuel from the lateral side and the upper surface is installed on the upper surface of the core shroud.

According to a fifteenth aspect of the present invention, the first traveling carriage equipped with a multistage telescopic mast is mounted on the first traveling carriage that travels on the orbit of the operation floor extending from above the fuel storage pool to above the reactor pressure vessel. In addition, a rotary carriage was provided on the upper surface of the core shroud, and a fuel lift truck and a fuel relay carriage carrying a plurality of fuels were installed on the rotary carriage, and it was possible to handle fuel using these. Is characterized by.

According to a sixteenth aspect of the present invention, in the fuel handling system for a nuclear reactor according to the fifteenth aspect, a second traveling carriage equipped with a device for suspending the fuel relay carriage is mounted on the track of the operation floor. To do.

According to a seventeenth aspect of the present invention, the first traversing carriage having the multistage telescopic mast mounted thereon can be traversed on the first traveling carriage that travels on the orbit of the operation floor above the reactor pressure vessel. A second traverse vehicle equipped with a multi-stage telescopic mast can be traversed on a second traveling bogie that travels on an operation floor track above the fuel storage pool, and travels between the first and second traveling bogies. On the third traveling vehicle, a third traverse vehicle having a device for suspending and transferring a fuel relay device carrying a plurality of fuels is traversed, and further, the reactor pit floor surface and the fuel storage pool floor surface It is characterized in that a plurality of fuel relay devices are installed in the vehicle, and these can be used to handle fuel.

According to the eighteenth aspect of the present invention, the fuel handling carriage is run on the track installed on the floor surface of the reactor pit and the upper surface of the frame of the fuel rack, and on the track of the operation floor above the reactor pressure vessel. It is characterized in that the traveling carriage provided on the transverse carriage mounted on the traveling carriage is driven, and the fuel is lifted and hung by the multistage telescopic mast, and the fuel is moved by the cooperative operation between the respective carriages. To do.

According to a nineteenth aspect of the present invention, a plurality of fuel handling traveling vehicles, traveling vehicles or traversing vehicles according to the eighteenth aspect are used, and a plurality of fuels are simultaneously or sequentially moved by using a fuel relay device. It is characterized by

[0026]

According to the present invention having the above-mentioned structure, it is possible to shorten the fuel handling period which constitutes the critical path of the regular inspection work of the light water cooling reactor, shorten the overall regular inspection period of the plant and reduce the nuclear plant. The utilization rate is effectively improved.

That is, regarding the time taken to take out one fuel, in the conventional method, it takes about 220 seconds to ascend and descend above the reactor pressure vessel, and about 40 seconds to traverse, and above the reactor pressure vessel. It takes about 50 seconds to go back and forth from the fuel storage pool to the fuel storage pool, about 150 seconds to move up and down for mounting on the fuel rack, about 80 seconds to traverse, and about 540 seconds in total.

On the other hand, in the case of the present invention, the fuel handling work cycle above the reactor pressure vessel, the reciprocation from above the reactor pressure vessel to the fuel storage pool, and the fuel above the fuel storage pool. The handling work cycle can be separated into parallel work, and therefore, for example, the cycle from the core to the fuel handling traveling vehicle is about 260 seconds, which is similar to the elevating and traversing above the conventional reactor pressure vessel. Cycle from reactor pit to fuel rack 2 (e
~ F ~ g) is the sum of about 50 seconds of reciprocating from above the reactor pressure vessel to the fuel storage pool and about 230 seconds of working time required for lifting and traversing for mounting on the fuel rack. Approximately 280 seconds is divided by the number of fuel handling traveling vehicles. That is, the criticality of the cycle when the present invention is adopted is about 260 seconds of the cycle above the reactor pressure vessel, and the fuel extraction period is reduced by, for example, about 280 seconds per fuel. As described above, according to the present invention, the fuel can be handled in about half the time of the conventional method.

[0029]

Embodiments of the present invention will be described below with reference to the drawings.

Example 1 (FIGS. 1 to 9) In this example, a track provided on the floor surface of the reactor pit and the upper surface of the frame of the fuel rack, a fuel handling carriage that travels on the track, and a reactor It is equipped with a traveling carriage that travels on the orbit of the operation floor above the pressure vessel and a traverse carriage that is mounted on this traveling carriage and has a multi-stage telescopic mast, and handles fuel underwater by cooperative operation of these. .

FIG. 1 is a diagram showing the overall structure of the apparatus, FIG. 2 is a plan view of the fuel rack portion shown in FIG. 1, FIG. 3 is a view taken along the line AA of FIG. 2, and FIG. 4 is a line BB of FIG. Fig. 5 is a plan view of the fuel handling traveling vehicle, Fig. 6 is a side view of the traveling vehicle with the fuel handling traveling vehicle mounted, and Fig. 7 is a state where the fuel traveling vehicle is moved to the rail on the upper surface of the frame of the fuel rack. FIG. 8 is a front view showing a riding state, FIG. 8 is a plan view showing a state where the traveling carriage is arranged above the core, and FIG. 9 is an operation explanatory view.

As shown in FIGS. 1 to 4, a track 14 and a rail 5 are provided on the floor surface of the reactor pit 1 and the upper surface of the frame 3 of the fuel rack 2 in the apparatus of this embodiment. The fuel handling traveling vehicle 6 is used to handle the fuel. In addition, 4 is an upper lattice plate which comprises a core.

The track 14 is laid from the floor surface of the reactor pit 1 to the floor surface of the canal 7, and the rail 5 is laid on the upper surface of the frame 3 of the fuel rack 2. A retracting track mount 8 and a track changing mount 9 are attached to both sides of the fuel rack 2. A track switching device 10 is attached to the escape track base 8. Tracks 11 and 12 and a switching track 13 are laid on them, and the switching track 13 is a track 1
1, 12 and the track 14 are connectable.

On the switching track 13, the tracks 11 and 12, and the track 14, a traveling vehicle 15 equipped with the fuel handling traveling vehicle 6 travels. The switching track 13 is driven by a driving device (not shown) via the assembled gear 16.

On the evacuation track base 8, more than the number of traveling carriages 15 in which the fuel handling traveling carriages 6 have been transferred onto the rails 5 remain. A track 17 is laid on the track changing base 9, and a travel vehicle 1 equipped with a fuel handling travel vehicle 6 is installed.
5 is installed.

FIG. 4 shows a state in which the fuel handling carriage 6 is transferred to the rail 5 on the upper surface of the frame 3 of the fuel rack 2. As shown in FIGS. 5 and 6, the fuel handling traveling vehicle 6 includes a set wheel 20, a set wheel drive device 21,
A column 22, a fuel elevating device 23, a fuel rotating mechanism 24, a fuel cradle 25, a fuel cradle moving device 26, a control device 27, a battery 28 and the like are attached.

A fuel fixing device 31, a fuel support mechanism 32, an arm mechanism 33, etc. are attached to the column 22. A pulley 34 is attached to the arm mechanism 33, is coupled so as to freely rotate around the axis of the column 22, and the gear set 36 is driven by a drive device 35 fixed to the column 22. The fuel fixing device 31 is composed of a driving device 37 utilizing water pressure (air, motor) or the like, a fixing arm 38, and a support 39. The support base 39 is fixed to the column 22 (see FIG. 5).

The fuel lifting device 23 includes a fuel gripping mechanism 41,
The wire 42, the wire winding device 43, the winding device driving device 44, the assembled gear 45, and the like. That is, the fuel gripping mechanism 41 is attached to the tip of the wire 42, the wire 42 is guided to the inside of the support column 22 via the pulley 34, and further supported via the pulley (not shown) attached to the lower portion of the support column 22. The wire winding device 43 is guided to the outside of 22.
To be wound up. The drive device 44 drives the wire winding device 43 via the assembled gear 45.

On the other hand, the fuel rotation mechanism 24 is composed of a drive device 51, a gear assembly 52, a rotation mechanism 53 and the like. The rotating mechanism 53 retracts the fuel receiving base 25,
The fuel 54 inserted in the center is rotated about its axis. Further, the fuel cradle moving device 26 includes a drive device 57, a gear assembly 58, a guide mechanism 59, and the like. The drive device 57 drives the assembled gear 58 to move the fuel receiving base 25 along the guide mechanism 59.

The battery 28 is a fuel handling traveling vehicle 6
It has a structure that can be replaced in water (see FIG. 5). The mounting width of the assembled wheel 20 is such that the traveling truck travels on the rail 5 laid on the upper surface of the frame 3 of the fuel rack 2 and travels on the tracks 12, 17 of the escape track mount 8 and the track changing mount 9. It is a structure that can be transferred to 15 rails 60.

Then, as shown in FIG.
A fuel handling traveling vehicle 6 is mounted on the vehicle and moves along a track 14 installed on the floor surface of the reactor pit 1. The traveling vehicle 15 is composed of wheel sets 61, a drive device (not shown), a rail 60, a control device 62, and the like. When the fuel handling traveling vehicle 6 is mounted on the traveling vehicle 15, it is fixed to the traveling vehicle 15 by the combiner 63. The signal / energy circuit between the fuel handling traveling vehicle 6 and the traveling vehicle 15 is coupled by the coupling unit 63.

Further, as shown in FIG. 1, a traveling carriage 73 equipped with a traverse carriage 72 to which a multistage telescopic mast 71 is attached.
However, the fuel 54 is lifted above the core 100,
The fuel handling traveling vehicle 6 can move to the tip position of the track 4 of the reactor pit 1 and receive the fuel 54.

Further, as shown in FIGS. 7 and 8, two traverse carriages 72 to which the multistage telescopic mast 71 is attached can be mounted on the traveling carriage 73.
3 can be arranged above the core 101.
A link type expansion / contraction mechanism 74 is attached to the tip of the multi-stage expansion / contraction mast 71, and the link type expansion / contraction mechanism 74 lifts the fuel 54 from the core 101 or the core 101.
It is possible to hang it on.

Next, the operation will be described.

First, the lid of the reactor pressure vessel 100 is removed, the multistage telescopic mast 71 is attached to the traveling carriage 73 on the operation floor 103, and it is moved above the reactor core 101. The orbit switching device 10 is installed in the fuel storage pool 10.
2 is suspended by an overhead crane, and the escape track base 8 is assembled. Operation trolley 1 equipped with fuel handling trolley 6
5 is mounted on a track 17 of a track changing mount 9 (which is always installed in the fuel storage pool 102 like the fuel rack 2). With the fuel handling traveling vehicle 6 mounted on the traveling vehicle 15, a plurality of vehicles are mounted on the track 11 of the escape track mount 8.
Complete the preparation for fuel handling work.

Next, a procedure for transferring the fuel 54 from the core 101 to the fuel rack 2 of the fuel storage pool 102 will be described. The traveling carriage 73 is moved to the vicinity of the fuel 54 for taking out the core 101, the multistage telescopic mast 71 is extended, and the fuel gripping tool attached to the tip thereof is arranged on the fuel 54 to be taken out. After holding the suspending metal member 55 for the fuel 54 with the fuel gripping tool, the multistage telescopic mast 71 is contracted, and the fuel handling traveling carriage 6 waiting on the track 14 of the reactor pit 1
The fuel 54 is lifted to a height at which the fuel 54 can be mounted.

The traveling carriage 15, with the fuel handling traveling carriage 6 mounted thereon, has moved to the tip position of the track 14 of the reactor pit 1 in advance and stands by. At that time, the arm mechanism 33 is rotated around the axis of the column 22 by the combined gear 36 by the drive device 35, and the fuel gripping mechanism 41 is retracted from the position directly above the fuel receiving base 25. The fuel receiving base 25 is moved to a position right below the fuel support mechanism 32 from the retracted position via the assembled gear 58 by making the driving device 57 work. Further, the fuel fixing device 31 keeps the fixing arm 38 open so that the drive device 37 can be operated and the fuel 54 can be received from the lateral direction.

The traveling carriage 73 and the traverse carriage 72 are caused to travel and traverse, and the fuel 54 held at the tip of the multistage telescopic mast 71 is moved to the position of the fuel receiving tray 25 of the fuel handling carriage 6. When the detector (not shown) detects that the fuel 54 has come to the predetermined position of the fuel pedestal 25, the multistage telescopic mast 71 is extended and lowered until the fuel 54 contacts the fuel pedestal 25. When the detector (not shown) detects that the fuel 54 has come into contact with the fuel pedestal 25, the drive device 37 is activated, the fixed arm 38 is closed, and the fuel 54 is held in a state of free movement in the direction of gravity. To do.

After the holding work is completed, the multistage telescopic mast 71 is extended until the fuel 54 is completely placed on the fuel receiving table 25. When it is detected that the vehicle is in the fully loaded state, the drive device 37 is activated again, and the fixing arm 38 is closed until the fuel 54 is completely fixed.

Thereafter, the fuel gripping state at the tip of the multistage telescopic mast 71 is released, the traveling carriage 73 and the traverse carriage 72 are made to travel and traverse, and the tip of the multistage telescopic mast 71 is placed at the position of the core 101 where the fuel 54 to be taken out next is located. Bring.

When the fuel gripping state at the tip of the multi-stage telescopic mast 71 is released and the multi-stage telescopic mast 71 is retracted, the drive device 35 causes the assembled gear 36 to work, and the arm mechanism 33 is rotated around the axis of the column 22 to hold the fuel. The mechanism 41 is moved directly above the fuel 54.

The drive mechanism 44 is actuated to drive the wire winding device 43 via the assembled gear 44 to unwind the wire 42, lower the fuel gripping mechanism 41, grip the hanging metal fitting 55, and move the carriage 15. The backup of the holding of the fuel 54 when the vehicle runs is performed.

The traveling carriage 15 is caused to travel on the track 4 and is moved from the floor surface position of the reactor pit 1 through the floor surface position of the canal 7 to the track 12 of the escape track mount 8. Fuel 54
When the traveling carriage 15 comes to the side of the rail 5 at the position of the fuel rack 2 to be loaded, the coupling machine 63 connecting the traveling carriage 15 and the fuel handling traveling carriage 6 is released. The fuel handling traveling carriage 6 is transferred from the traveling carriage 15 onto the rail 5 laid on the upper surface of the fuel rack 2. When the fuel handling carriage 6 comes to the fuel storage position, the drive device 37 is operated to fix the fuel 54 by the fixed arm 38 so that the fuel 54 can move freely in the direction of gravity.

Subsequently, the drive unit 44 is activated to drive the gear set 4
5 to drive the wire winding device 43 to move the wire 4
2 is wound up to lift the fuel 54,
When the lower end of the fuel cradle reaches a position higher than the upper end of the fuel cradle 25, the lifting is stopped, the drive device 57 is operated, and the fuel cradle 25 is moved to the retracted position via the assembly gear 58.

When it is confirmed that the fuel receiving base 25 is retracted, the driving device 44 is operated again, the wire winding device 43 is driven through the assembled gear 45, the wire 42 is unwound, and the fuel 54 is suspended. , The fuel rotation mechanism 24 is inserted into the opening. When the insertion is confirmed, the drive device 51 is operated to rotate the rotating mechanism 53 through the assembled gear 52 so that the fuel 54 can be inserted into the opening of the fuel rack 2.

When it is confirmed that the wire has been rotated to the position where it can be inserted, the driving device 44 is operated, the wire winding device 43 is driven through the assembled gear 45, the wire 42 is unwound again, and the fuel 54 is suspended. Take it down. Fuel 5
When the lower end of 4 reaches the lower end of the fuel rack 2, the unwinding operation of the wire 42 is stopped, and the holding state of the fuel 54 by the fuel holding mechanism 41 is released.

Subsequently, the drive mechanism 44 is operated to drive the assembled gear 45.
The wire winding device 43 is driven via the
When the fuel gripping mechanism 41 reaches a position higher than the hanging metal fitting 55 when the fuel 54 is loaded on the fuel handling carriage 6, the winding of the wire 42 is stopped.

The fuel handling traveling vehicle 6 is caused to travel along the rails 5 laid on the upper surface of the fuel rack 2 and transferred to the traveling vehicle 15 which is on standby on the track 12 of the escape track mount 8. The coupling machine 63 is operated to couple the traveling carriage 15 and the fuel handling traveling carriage 6 to each other. With the fuel handling traveling vehicle 6 mounted on the traveling vehicle 15, the traveling vehicle 15 is moved again to the tip of the track 4 of the reactor pit 1, and the next fuel 54
To wait to receive.

In the meantime, the arm mechanism 33 is rotated around the axis of the column 22 by operating the assembled gear 36 by the drive unit 35, and the fuel gripping mechanism 41 is retracted from the position directly above the fuel receiving base 25. The fuel receiving base 25 is moved to a position right below the fuel support mechanism 32 from the retracted position via the assembled gear 58 by the action of the drive device 57. Further, the fuel fixing device 31 is provided so that the fuel 54 can be received from the lateral direction.
The drive device 37 works so that the fixed arm 38 is opened.

While one fuel handling traveling vehicle 6 is loading the fuel 54 onto the fuel rack 2, another fuel handling traveling vehicle 6 is mounted on the traveling vehicle 15 and the trajectory of the reactor pit 1 is maintained. Move to the tip of No. 4
To wait to receive. In the middle of the move,
When it becomes necessary to move around the traveling vehicle 15 on which the fuel handling traveling vehicle 6 carrying the fuel 54 to the fuel rack 2 is avoided, the traveling vehicle 75 on which the fuel handling traveling vehicle 6 is mounted is The track 12 is transferred to the switching track 13 of the track switching device 10. The gear set 16 is driven so as to connect the switching track 13 to the track 11 in the transferred state.

When the connection is completed, the vehicle is transferred from the switching track 13 to the track 11, travels on the track 11, and is transferred again to the switching track 13 of the track switching device 10. The assembled gear 16 is driven in the state of being transferred, and moved so as to be connected to the track 12. After the connection is completed, the avoidance work is completed by transferring from the switching track 13 to the track 12 and traveling from the track 12 onto the track 14. When the avoidance work is not required, the vehicle directly travels from the track 12 onto the track 4.

When a plurality of fuel handling traveling vehicles 6 are loading the fuel 54 onto the fuel rack 2, the fuel handling traveling vehicles 6 which have finished the work are supplied to the reactor pit 1 in order to receive another fuel 54 again. When it is necessary to avoid the other fuel handling traveling carriage 6 during the loading operation of the fuel 54 to the fuel rack 2 in the case of moving it toward the vehicle on the track 12, the track changing base 9 Orbit 17
The fuel handling traveling vehicle 6 is mounted on the traveling vehicle 15 that travels exclusively on the above, and is moved to the position of the rail 5 where the other fuel handling traveling vehicle 6 during work can be avoided. Then, the traveling carriage 15 is transferred to the rail 5, travels on the rail 5, and is transferred to the dedicated traveling carriage 15 mounted on the track 12 of the evacuation track mount 8 again, and then the above avoidance movement operation is performed. Let

According to the first embodiment described above, the following effects can be obtained.

Regarding the time required to take out one fuel 54, as shown in FIG. 9, in the conventional method, it takes about 22 to move up and down (a-b-c-d) above the reactor pressure vessel 100.
It takes about 0 seconds (A = 100 seconds, B = 50 seconds, C = 70 seconds), traverse (d to e) takes about 40 seconds (D = 40 seconds), and fuel is stored from above the reactor pressure vessel 100. About 50 seconds (E = 50) for round trip (E to f) to the pool 102
Second), and ascending / descending for mounting on the fuel rack 2 (g ~
h) takes about 150 seconds (G = 150 seconds), traverse (f to g) takes about 80 seconds (F = 80 seconds), and it takes about 540 seconds in total.

On the other hand, in the case of the above embodiment, the fuel handling work cycle above the reactor pressure vessel 100 and the fuel storage pool 1 from above the reactor pressure vessel 100.
It can be separated into round trips up to 02 and parallel operations of the fuel handling work cycle above the fuel storage pool 102. The cycle from the core 101 to the fuel handling traveling vehicle 6 is performed by moving up and down (a to
b to c to d) and transverse (d to e), it takes about 260 seconds. However, the cycle (e to f to g) from the reactor pit 1 to the fuel rack 2 is about 50 seconds from the upper part of the reactor pressure vessel 100 to the fuel storage pool 102 and the mounting on the fuel rack 2. Is a value obtained by dividing about 280 seconds, which is the sum of the working time of about 230 seconds required for raising and lowering and traversing, for the number of the fuel handling carriages 6. That is, the criticality of the cycle when the present embodiment is adopted is that the cycle above the reactor pressure vessel 100 (a to
(b-c-d) is about 260 seconds, and the fuel extraction period is reduced by about 280 seconds in terms of one fuel. This means that the fuel can be handled in about half the time of the conventional method.

Various modifications can be made to the first embodiment described above. The modification will be described below.

(First Modification) In this modification, as shown in FIG. 8, a traverse 73 in which a multistage telescopic mast 71 is attached to a traveling carriage 73 traveling on a track of an operation floor 103 above a reactor pressure vessel 100. Equipped with multiple carts 72,
A plurality of fuel handling traveling vehicles 6 are caused to travel on a track 14 laid on the floor of the reactor pit 1, and a cooperative operation such as delivery of a plurality of fuels 54 is performed underwater.

This first modification is essentially the same as the above-mentioned embodiment, but differs in the following points. That is, a plurality of traveling carriages 15 equipped with the fuel handling traveling carriage 6 are moved to the tip of the track 14 of the reactor pit 1 and made to stand by. On the other hand, a plurality of transverse carriages 72 that traverse above the traveling carriage 73.
A plurality of fuel 54 is lifted from the core 101 by the link type expansion mechanism 74 of the front end mast of the multi-stage expansion mast 71 mounted on the vehicle, and the traveling carriage 73 and the traverse carriage 72 are made to travel and traverse, and the fuel handling is on standby. The fuel 54 is moved to the position of the traveling carriage 6, and the fuel 54 is sequentially transferred to the fuel handling traveling carriage 6. Regarding the other points, the same fuel handling as in the above embodiment is performed.

The effects of the first modification will be described below.

That is, a fuel handling work cycle above the reactor pressure vessel 100 (a to b to c to d) and a reciprocation (e to f) from above the reactor pressure vessel 100 to the fuel storage pool 7 and It is possible to separate the fuel handling work (fgh) above the fuel storage pool 7 into parallel work cycles. The transfer cycle (a-b-c-d) of the fuel 54 from the core 101 to the fuel handling traveling vehicle 6 is about 1 which is about 1/2 that of the above-described embodiment when two traversing vehicles 72 are used.
It takes about 30 seconds.

In the cycle (e to f to g to h) from the reactor pit 1 to the fuel rack 2, when the fuel handling traveling vehicle 6 which is twice as large as that in the above embodiment is introduced, the fuel handling traveling vehicle 6 moves from the core 101 to the fuel handling traveling vehicle 6. It can be no more than the transition cycle of fuel 54. When this modified example is adopted, the cycle criticality is about 130 seconds of the cycle (ab-cd) above the reactor pressure vessel 100, and the fuel extraction period per body is about 410 seconds. It is reduced by about a second. This is equivalent to the fact that the extraction period can be shortened to about 1/4 that of the conventional method.

(Second Modification) In this modification, a traveling carriage 73 traveling above the reactor pressure vessel 100 is equipped with a plurality of traversing carriages 72 each having a multi-stage telescopic mast 71, and the reactor pit 1 A part of the track 14 laid on the floor is made parallel to the traveling carriage 73, a plurality of fuel handling traveling carriages 6 are made to stand by in this portion, and a plurality of fuels 54 are delivered at the same time. It was designed to be performed in water.

This modification is also essentially the same as the above embodiment, but is different in the following points. That is, a plurality of traveling carriages 15 equipped with the fuel handling traveling carriages 6 are caused to travel on the track 14 of the reactor pit 1 and are moved to the track 14 installed in parallel with the travel carriage 73 to stand by.

A plurality of fuels 54 are lifted from the reactor core 101 (or a plurality of fuels 54 are lifted from the core 101 by the fuel gripping tool attached to the tip of the tip end mast of the multistage telescopic mast 71 mounted on the plurality of traverse carriages 72 traversing the traveling carriage 73. , Multi-stage telescopic mast 7
The core 101 with the link type expansion / contraction mechanism 74 of the first end mast
A plurality of fuels 54 are hung up from each other), the traveling carriage 73 and the traverse carriage 72 are made to travel and traverse, and the multistage telescopic mast 71 is waiting on the floor of the reactor pit 1 Move right above the cradle 25,
The fuel 54 is delivered to the fuel handling traveling vehicle 6.

Then, the fuel handling traveling vehicle 6 is operated in the same manner as in the above-mentioned embodiment, and the fuel 54 is loaded on the fuel rack 2. By repeating these operations,
The fuel 54 is taken out of the core 101. The loading of the fuel 54 on the core 101 is performed in the reverse order of the above.

The effects of the second modification will be described below.

That is, as shown in FIG. 9, as in the case of the first modification, the fuel extraction period is reduced by about 410 seconds per fuel. This is equivalent to the fact that the extraction period can be shortened to about 1/4 that of the conventional method. Particularly different from the first modification, a plurality of fuel handling traveling vehicles 6 stand by in a state parallel to the traveling vehicles 73, and a plurality of bodies suspended by a multistage telescopic mast 71 attached to a plurality of traversing vehicles 72. That is, since the fuel 54 is transferred at the same time, the interference avoidance waiting time of the plurality of traverse carriages 72 becomes unnecessary.

(Third Modification) In a third modification of this embodiment, a multistage telescopic mast 71 is attached to a first traveling carriage 73 that travels on the orbit of the operation floor 103 above the reactor pressure vessel 100. In addition to mounting a plurality of first traversing carriages 72 and making a part of the track 14 laid on the floor of the reactor pit 1 parallel to the traveling carriage 73, the fuel storage pool 102 is equipped with atomic units (not shown). A platform having the same height as the floor surface of the reactor pit 1 is installed, and a track is laid on the platform connected to the reactor pit 4, and a part of the track is oriented parallel to the traveling carriage 73. A plurality of fuel handling traveling vehicles 6 can stand by in a portion of a track parallel to the traveling vehicles 73.

Then, a plurality of second traverse carriages having multi-stage telescopic masts are mounted on the second traveling carriage that travels on the orbit of the operation floor 103 above the fuel storage pool 102, and the reactor pressure vessel 100 is installed. Of a plurality of fuels 54 at the same time by a multi-stage telescopic mast mounted on a plurality of traversing carriages that traverse above the traveling carriage 73 that travels above the fuel storage pool 102 and the traveling carriage that can travel above the fuel storage pool 102. The cooperative operation is performed underwater.

The third modification is essentially the same as the second modification, but is different in the following points. That is, a plurality of traveling carriages 15 equipped with the fuel handling traveling carriage 6 have the same height as the track 14 of the reactor pit 1 and the floor surface of the reactor pit 1 installed in the fuel storage pool 102 connected thereto. It is designed to run on a track 14 on a gantry.
In addition, a plurality of traveling carriages 15 are connected to the track 1 of the reactor pit 1.
It moves to the track 14 installed in parallel with the traveling carriage 73 of No. 4 and stands by.

A fuel gripping tool attached to the tip of the tip end mast of the multistage telescopic mast 71 mounted on the plurality of first traverse trucks 72 traversing the first traveling carriage 73. The fuel 54 is lifted (or the link type expansion mechanism 7 of the front end mast of the multi-stage expansion mast 71).
4, a plurality of fuels 54 are lifted from the core 101), and the first traveling carriage 73 and the first traversing carriage 72 are made to travel and traverse to make the multi-stage telescopic mast 71 a plurality of fuel handling carriages 6 Moved just above 25, fuel 5
4 is transferred to a plurality of fuel handling traveling vehicles 6.

The first traveling carriage 73 which has delivered the fuel 54 moves to the core 101 to carry out the next lifting operation of the fuel 54, and repeats the above operation. At the same time, a plurality of fuel-handling traveling carriages 6 are connected to the fuel storage pool 10
The vehicle travels to the track 14 installed on the gantry installed in No. 2, and is moved to the track 14 installed in parallel with the first traveling carriage 73, and stands by.

Tip of multi-stage telescopic mast mounted on a plurality of second traverse trucks traversing the second traveling carriage traveling on the orbit of the operation floor 103 above the fuel storage pool 102. Tip of the stage mast. The fuel gripping tool attached to the vehicle is brought directly above the fuel 54 mounted on the plurality of fuel handling carriages 6 to lift the fuel 54.

The fuel handling traveling vehicle 6 that has delivered the fuel 54 is placed at the position of the orbit 14 installed parallel to the first traveling vehicle 73 of the orbit 14 of the reactor pit 1 for the next transportation of the fuel 54. Move it and make it stand by. At the same time, a second traveling carriage that travels on the track of the operation floor 103 above the fuel storage pool 102 and a plurality of second traversing carriages that traverse the second traveling carriage are run and traverse, and are suspended on a multistage telescopic mast. The fuel 54 is moved to a predetermined position on the fuel rack 2, and at the same time, a plurality of fuels 54 are loaded on the fuel rack 8.

Thereafter, by repeating these operations, the fuel 54 is taken out from the core 101. The loading of the fuel 3 on the core 65 is performed in the reverse order of the above.

According to the third modification, the fuel removal period can be shortened by about 410 seconds in terms of per fuel, as in the second modification. This is equivalent to the fact that the extraction period can be shortened to about 1/4 that of the conventional method. The handling cycle of the fuel 54 above the fuel storage pool 7 is the same as that of the second modification, but there is an advantage that the operation is easier because the device is simple.

(Fourth Modification) In the fourth modification of this embodiment, the fuel storage pool 102 in the second embodiment is used.
The fuel rack 2 installed in the vehicle is divided into two parts, and the first traveling carriage 73 traveling on the orbit of the operation floor 103 above the reactor pressure vessel 100 and the orbit of the operation floor 103 above the fuel storage pool 102. A plurality of first vehicles crossing over a second traveling vehicle traveling above
And a multi-stage telescopic mast mounted on the second transverse carriage, a track 14 laid on a pedestal installed on the floor of the reactor pit 1 and the floor of the fuel storage pool 102 (partly parallel to the traveling carriage). A plurality of fuel handling traveling vehicles 6 traveling on a track (including an orbit) perform a cooperative operation such as simultaneous delivery of a plurality of fuels 54 in water.

The operation of the fourth modification is essentially the same as that of the third modification, but differs in the following points. A plurality of second vehicles traversing a second traveling vehicle that travels on the track of the operation floor 103 above the fuel storage pool 102.
When carrying out the work of transferring a plurality of fuels 54 to the fuel rack 2 divided into two places by the multistage telescopic mast mounted on the traversing vehicle, it is not necessary to retract the second traversing vehicle by interference.

Therefore, according to the fourth modification, as in the case of the third modification, the fuel extraction period can be shortened by about 410 seconds in terms of per fuel, which is about 1/4 of the conventional method. Needless to say, it is possible to shorten the extraction period of the fuel storage pool 102, unlike the third modification.
When waiting for a plurality of fuels 54 to be handled by a plurality of second traverse trucks traversing the second traveling carriage that travels on the orbit of the operation floor 103 above the second traverse carriage, the second traverse carriage has an interference evacuation waiting time. Since there is no problem, it is easy to create a work plan.

Example 2 (FIGS. 10 to 15) In this example, on a traveling carriage traveling on the orbit of the operation floor 103 above the reactor pressure vessel 100,
A traverse carriage 72 having a multi-stage telescopic mast 71 mounted thereon is traversed, and the reactor pressure vessel 100 and the core shroud 1 are
04, a fuel relay device 81 that rotates in the circumferential direction is installed, and an elevating device 82 that elevates and lowers the fuel 54 from the fuel relay device 81, the floor of the reactor pit 1, and the fuel rack 2.
The vehicle is provided with a track 14 provided on the upper surface of the frame body 3 and a fuel handling traveling vehicle 6 traveling on the track 14, and the fuel is handled underwater by the cooperative operation of these.

FIG. 10 is a schematic view showing the overall structure of the device, FIG. 11 is a vertical cross-sectional view of the fuel relay device 81, FIG. 12 is a vertical cross-sectional view showing the fuel delivery state, and FIG. 13 is a vertical cross-sectional view showing the fuel lifting state. FIG. 14 is a vertical sectional view showing a fuel handling state in the multistage telescopic mast.

As shown in FIG. 10, the reactor pressure vessel 10
0 and the core shroud 104, a fuel relay device 81 is installed, and the fuel elevating device 82 can deliver the fuel 54 to the fuel handling carriage 6.

The fuel relay device 81 is used in the reactor pressure vessel 10.
0 and the core shroud 104, the fixed frame 8
Core shroud 104 or reactor pressure vessel 1 in 3 parts
It is fixed at 00. The rotary frame 84 installed inside the fixed frame 83 is rotationally driven by the drive device 86 via the assembled gear 85.

A pedestal (not shown) for holding the fuel 54 is attached to the rotary frame 85. Reactor pit 1
A fuel elevating device 82 is installed on the floor surface. The fuel elevating / lowering device 82 includes a traveling type winding device 89 that winds a wire 88 having a grip 87 attached to its tip, and a traveling rail 90.
And a pillar 91.

Further, the grasping tool 87 is provided with a sensor for detecting the grasping state of the fuel 54, an observation camera (not shown), and the like. Driving of the traveling winding device 89, transmission of control signals, and the like are performed by a control panel via cables.

Further, as shown in the longitudinal sectional structure of the fuel relay device 81 in FIG. 11, a rotary frame 84 for holding the fuel 54 is attached inside the fixed frame 83, and a track 92 is installed on the fixed frame 83. Wheel set 9 mounted on the rotating frame 84
3 is configured to be in rotary contact.

That is, the wheel assembly 93 is attached inside and outside above the rotary frame 84 so as to move while rotating in contact with the plane of the frame structure portion of the fixed frame 83.
The drive device 86 fixed to the upper surface of the No. 3 rotates the rotary frame 84 via the assembled gear 85. The power supply for driving is performed by the control panel via a cable.

Further, as shown in FIG. 12, the fuel 54 is
The fuel 3 is delivered from the fuel relay device 81 to the fuel handling traveling carriage 6 by the articulated arm device 94, and the traveling carriage 95 and the articulated arm 96 are attached to the articulated arm device 94. . A telescopic mast 97 is attached to the tip of the multi-joint arm 96.

A gripping member 98 for the fuel 54 is attached to the tip of the telescopic mast 97, and the fuel 5 is attached to the gripping member 98.
A sensor for detecting the grasping condition of No. 4 and an observation camera (not shown) are attached. Driving of the articulated arm device 94, transmission of control signals, and the like are performed from a control panel via a cable. An angle detection device and a drive device are attached to the joint at the tip of the multi-joint arm 96 so that the telescopic mast 97 is vertical. The expansion / contraction of the expansion / contraction mast 97 is performed by winding a wire attached to the tip of the mast. A state in which the fuel 54 is lifted up by the multi-joint arm device 94 is shown in FIG. 13 as a vertical sectional view.

Further, as shown in FIG. 14, the fuel relay device 81 is installed between the reactor pressure vessel 100 and the core shroud 104, and the first and second traveling carriages 110, 110 running on the operation floor 104 are connected. The first and second multi-stage telescopic masts 114 and 115 mounted on the first and second traverse carriages 112 and 113 are mounted on top of the fuel 111 for fuel 3
Are dealing with.

Further, as shown in FIG. 15, the electrorheological application dashpot 116 is attached to the fuel rack 2. In the electrorheological applied dashpot 116, the fuel tray 117 and the fixed base 118 are connected by the bellows 119, the inside of which is filled with the electrorheological fluid 120, and the distance between them is kept constant by the spring 121 when no load acts. It has become so. Inside the fuel receiving tray 117 and the fixed base 118, a concentric cylindrical electrode 124 is fixed via insulators 112 and 123.

That is, the cylindrical insulator 123 is fixed to the electrode 124 fixed between the fuel receiving tray 117 and the electrode 12 fixed to the insulator 125 and the fixing base 118.
4 is in contact with each other. Outermost electrode 1
The gap with the insulator 123 attached to 24 is such that the flow resistance of the electrorheological fluid 120 becomes small. An insulator having a flow path gap 126 is fixed to the electrode 124 fixed to the fixed base 118, and the insulator and the electrode 124 fixed to the fuel tray 117 are in contact with each other.

A part of the inner wall surface of the flow path gap 126 forms the electrode 124. The bellows 12 is attached to the fixed base 118.
7 is attached and a lower chamber 128 is formed. The concentric cylindrical electrode 124 is formed with holes 129 and 130 through which the electrorheological fluid 120 passes. Fuel tray 11
An upper chamber 131 is formed below 7. Note that electrode 1
The electrical cable to 24 is not shown.

The operation principle of the electrorheological application dashpot 116 will be described. When the fuel 54 comes into contact with the fuel pan 117 and a load is applied to the fuel pan 117, the fuel pan 117 moves to the spring 1
26 and the bellows 119 while being compressed. At that time, the electrode 124 fixed to the fuel receiving tray 117 also descends, the volume inside the electrode 124 decreases, and the electrorheological fluid 120 filling that portion is filled with the holes 130 and the flow path gap 1.
26, through the holes 129 and into the lower chamber 128, extending the bellows 127 to increase the lower chamber 128 by the same amount as the volume reduction in the electrode 124.

When the magnitude of the voltage applied to the electrode 124 is controlled, the electrorheological fluid 12 passing through the flow path gap 126 is controlled.
The flow resistance of 0 changes. By decelerating the fuel 54 on the fuel rack 2 at the maximum allowable acceleration, the time required for sitting can be minimized.
By controlling the flow resistance of the electrorheological fluid 120 passing through the flow path gap 126, this allowable acceleration is realized and the time required for seating is minimized.

Next, the operation will be described.

First, the lid of the reactor pressure vessel 100 is removed, and the traveling carriage 7 on the operation floor 103 is removed.
A multi-stage telescopic mast 71 is attached to No. 3, and it moves above the core 101. The fuel lifting device 82 is installed by suspending it in the reactor pit 1 with an overhead crane. Further, the track switching device 10 is suspended in the fuel storage pool 102 by an overhead crane to assemble the escape track mount 8.

The traveling carriage 15 on which the fuel handling traveling carriage 6 is mounted is mounted on the track 17 of the track changing rack 9 (which is always installed in the fuel storage pool 102 like the fuel rack 2). With the fuel handling traveling vehicle 6 mounted on the traveling vehicle 15, a plurality of vehicles are mounted on the track 11 of the retractable track mount 8 to complete the preparation for the fuel handling work.

Next, a procedure for transferring the fuel 54 from the core 101 to the fuel rack 2 of the fuel storage pool 102 will be described.

The traveling carriage 73 is moved to the vicinity of the fuel 54 for taking out the core 101, the multistage telescopic mast 71 is extended, and the fuel gripping tool attached to the tip thereof is arranged on the fuel 54 to be taken out. After holding the suspending metal member 55 for the fuel 54 with the fuel gripping tool, the fuel 54 is lifted from the top of the core 101 to a certain height position. The traveling carriage 73 and the transverse carriage 72 are caused to travel and traverse, and the multistage telescopic mast 7
1 is brought directly above the tray for the fuel 54 of the fuel relay device 81.

The mast of the multistage telescopic mast 71 is extended and the fuel 54 is loaded into the fuel relay device 81. When the loading is completed, the traveling carriage 73 and the traverse carriage 72 are made to travel and traverse, and moved to the position of the core 101 where the fuel 54 to be taken out next is located. After that, the gripped state of the fuel 54 of the multi-stage telescopic mast 71 is released, the rotating frame 84 of the fuel relay device 81 is rotated by the drive device 86, and it is moved to a position where the lifting work by the fuel elevating device 82 is possible.

On the other hand, in a state where the fuel handling traveling vehicle 6 is mounted on the traveling vehicle 15, it is moved to the tip position of the track 14 of the reactor pit 1 in advance and made to stand by. At that time, the driving device 35 causes the assembled gear 36 to work to move the arm mechanism 33 to the support 22.
The fuel gripping mechanism 41 is retracted from the position directly above the fuel receiving base 25 by rotating the fuel holding mechanism 41 about the axis of the above. The fuel cradle 25 is
The drive device 57 retracts from the retracted position via the assembled gear 58. The fuel pedestal 25 is moved from the retracted position by the drive device 57 via the assembled gear 58 to a position right below the fuel support mechanism 32. Further, the fuel fixing device 31 has the fixing arm 38 opened so that the fuel 3 can be received from the lateral direction by the action of the drive device 37.

The wire winding device 89 is moved on the rail 90, and the grip 87 is brought right above the fuel 54 mounted on the tray of the fuel 54 of the fuel relay device 81, and the wire 88 is extended to grasp the grip. Grab the fuel 54 at 87. And
The fuel 54 is lifted to a height at which the fuel 54 can be mounted on the fuel handling carriage 6 waiting on the track 4 of the reactor pit 1. The fuel 54 grasped by the grasping tool 87 is moved by the winding device 89 to a position directly above the fuel receiving base 25 of the fuel handling carriage 6.

When a detector (not shown) detects that the fuel 54 has reached a predetermined position of the fuel receiving tray 25, the wire 88 is extended and lowered until the fuel 54 comes into contact with the fuel receiving tray 25. When the detector (not shown) detects that the fuel 54 has come into contact with the fuel cradle 25, the drive device 3
7, the fixed arm 38 is closed and the fuel 54 is held in a state of being free to move in the direction of gravity. After the holding work is completed, the wire 88 is extended until the fuel 54 is completely placed on the fuel pedestal 25. When the fully loaded state is detected (detector (not shown)), the driving device 37 is activated again, and the fixing arm 38 is closed until the fuel 54 is completely fixed.

After that, the fuel gripping state of the tip of the wire 88 is released, the traveling type winding device 89 is moved on the rail 90, and the gripping device 87 causes the fuel relay device 81 to be directly above the fuel 54 mounted on the pan. Fuel to be removed next
To wait for.

When the fuel gripping state at the tip of the wire 88 is released and the grip 87 at the tip of the wire 88 is retracted,
The drive device 35 operates the assembled gear 36 to rotate the arm mechanism 33 around the axis of the column 22, and the fuel gripping mechanism 24 to the fuel 54.
Move it right above. Then, drive the drive device 51,
The wire winding device 43 is driven through the assembled gear 45, the wire 88 is unwound, the fuel gripping mechanism 24 is lowered, and the hanging metal fitting 55 of the fuel 54 is gripped, and the traveling carriage 1
5 backs up the retention of fuel 54 when traveling.

Thereafter, the fuel 54 is loaded on the fuel rack 2 in the same procedure as in the first embodiment described above. By repeating these operations, the fuel 54 is taken out from the core 101. The loading of the fuel 54 on the core 101 is performed in the reverse order of the above.

According to the second embodiment described above, the following effects are obtained.

Regarding the time required to take out one fuel 54, in the conventional method, as shown in FIG. 9, it takes about 2 times to go up and down (a-b-c-d) above the reactor pressure vessel 100.
About 20 seconds (A = 100 seconds, B = 50 seconds, C = 70 seconds)
It takes about 40 seconds to traverse (d to e) (D = 40 seconds)
It takes about 50 seconds (E = 5) to make a round trip (e to f) from above the reactor pressure vessel 100 to the fuel storage pool 102.
It takes 0 seconds, and goes up and down for mounting on the fuel rack 2 (g
~ H) takes about 150 seconds (G = 150 seconds), traverse (fg) takes about 80 seconds (F = 80 seconds), and it takes about 540 seconds in total.

On the other hand, in the case of the second embodiment, the fuel handling work cycle (a
-B, d-e) and the reciprocation from above the reactor pressure vessel 100 to the fuel storage pool 102 (a-b-c-d, e-).
f), and the fuel handling work above the fuel storage pool 102 (f-g-h) can be separated into parallel work cycles. Fuel 54 from the core 101 to the fuel relay device 81
The cycle (a-b, d-e) for transferring the fuel is ascending (a-b, d-e) by about the fuel length above the conventional reactor pressure vessel 100.
b), about half the conventional traversing distance (d to e) (because it is sufficient to move the shortest distance in the circumferential direction), the fuel relay device 81
Amount of fuel for loading fuel into the
It takes about 120 seconds because it moves in b). The fuel transfer cycle from the fuel relay device 81 to the fuel handling carriage 6 is ascending / descending (a-b-c-d) and moving in the circumferential direction. ~ C ~ d) with the addition of circumferential movement.

If the traveling speed is such that the traveling time in the circumferential direction is about the same as the conventional traverse (d to e), the transfer cycle in this case is about 260 seconds. Fuel transfer cycle from the reactor pit 1 to the fuel rack 2 (e-f-g-
h) is a round trip (e to f) from above the reactor pressure vessel 100 to the fuel storage pool 102 for about 50 seconds (E = 5).
0 seconds), and ascending / descending for mounting on the fuel rack 2 (g ~
h), about 280 seconds, which is the sum of the working time of about 230 seconds required for traverse (f to g), is input, which is a value divided by the number of fuel handling traveling vehicles 6.

The criticality of the cycle when this embodiment is adopted is that the fuel handling device 81 moves from the fuel relay device 81 to the traveling carriage 6
It takes about 260 seconds for the fuel transfer cycle to
The fuel extraction period is about 280, converted to 4 units.
It is reduced by about a second. This is equivalent to the fact that the extraction period can be shortened to about half that of the conventional method.

Various modifications can be made to the second embodiment described above. The modification will be described below.

(First Modification) In this modification, the rotary frame 84 of the fuel relay device 81 installed between the reactor pressure vessel 100 and the core shroud 104 and rotating in the circumferential direction is floated by water pressure. In the same manner as in the second embodiment, the fuel is handled underwater by the coordinated operation of various devices.

That is, in this modification, the driving force by the driving device 86 can be reduced by utilizing the water pressure, so that the battery or the like can be made non-cable. By using only water as the driving force, there is no need to use a large amount of electric power, and there is no need to consider a watertight structure such as a cable or a motor. In this case, the battery is sufficient for power for signal transmission, operation control, and measurement.

According to the first modification as described above, the fuel extraction period is reduced by about 280 seconds in terms of the fuel 3 per body. This is equivalent to the fact that the extraction period can be shortened to about half that of the conventional method. Particularly different from the second embodiment described above, since the rotating frame 84 of the fuel relay device 81 is floated by water pressure, the driving force required for rotation may be small, battery driving is possible, and water driving is watertight. The point is that there is no need for a structure, the structure is simple, and only battery equipment for signal transmission, control, and measurement is required, and the system is simpler.

(Second Modification) In this modification, a multistage telescopic mast 71 is mounted on a traveling carriage 73 which travels on an orbit of the operation floor 103 above the reactor pressure vessel 100.
The traverse carriage 72 with the
00 and the core shroud 104, a fuel relay device 81 that rotates in the circumferential direction is installed, and an articulated arm device 94 that elevates the fuel 54 from the fuel relay device 81 is installed on the floor surface of the reactor pit 1. A track 14 is provided on the floor surface of the reactor pit 1 and the top surface of the frame 3 of the fuel rack 2, and the fuel handling carriage 6 runs on the track 14 so that the fuel is handled underwater by the cooperative operation of these. It is the one.

In the second modification, first, the lid of the reactor pressure vessel 100 is removed, the multistage telescopic mast 71 is attached to the traveling carriage 73 on the operation floor 103, and the multistage expansion mast 71 is moved above the reactor core 101. Articulated arm device 9
4 is installed in the reactor pit 1 with an overhead crane. The orbit switching device 10 is suspended in the fuel storage pool 102 by an overhead crane to assemble the escape track base 8. The traveling carriage 15 equipped with the fuel handling traveling carriage 6 is mounted on the track 17 of the track changing rack 9 (which is always installed in the fuel storage pool 102 like the fuel rack 2). With the fuel handling traveling vehicle 6 mounted on the traveling vehicle 15, a plurality of vehicles are mounted on the track 11 of the retractable track mount 8 to complete the preparation for the fuel handling work.

Next, a procedure for transferring the fuel 54 from the core 101 to the fuel rack 2 of the fuel storage pool 102 will be described. The traveling carriage 73 is moved to the vicinity of the fuel 3 for taking out the core 101, the multi-stage telescopic mast 71 is extended, and the fuel gripping tool attached to the tip thereof is arranged on the fuel 54 to be taken out. When the mast is extended and the lifting metal fitting 55 for the fuel 54 is gripped, the fuel 54 is lifted from the top of the core 101 to a certain height.

The traveling carriage 73 and the traverse carriage 72 are caused to travel and traverse, and the multistage telescopic mast 71 is attached to the fuel relay device 81.
Bring it directly above the fuel 54 saucer. The mast of the multi-stage telescopic mast 71 is extended and the fuel 54 is fed to the fuel relay device 81.
To load. When the loading is completed, the traveling carriage 73 and the traverse carriage 72 are caused to travel and traverse, and then the fuel 5 to be taken out
4 is moved to the position of the core 101. When the gripped state of the fuel 54 of the multi-stage telescopic mast 71 is released, the rotation 84 of the fuel relay device 81 is rotated by the drive device 86 and moved to a position where the lifting work by the multi-joint arm device 94 is possible.

With the fuel handling traveling vehicle 6 mounted on the traveling vehicle 15, the vehicle is preliminarily moved to the tip position of the orbit 14 of the reactor pit 1 and made to stand by. At that time, the drive device 35
Causes the assembled gear 36 to work to rotate the arm mechanism 33 around the axis of the column 22, thereby retracting the fuel gripping mechanism 74 from the position directly above the fuel receiving base 25. Fuel cradle 2
5 operates the drive device 57 to operate the combined gear 58.
Is moved from the retracted position to directly below the fuel support mechanism 32. Further, the fuel fixing device 31 keeps the fixing arm 38 open so that the drive device 37 can be operated and the fuel 54 can be received from the lateral direction.

The articulated arm 96 of the articulated device 94 is driven,
The telescopic mast 97 is moved onto the reactor pressure vessel 100, the grip 98 is placed directly above the fuel 54 mounted on the pan of the fuel relay device 81, the telescopic mast 97 is extended, and the fuel 54 is moved by the grip 98. After gripping, the fuel handling carriage 6 waiting on the track 14 of the reactor pit 1
The fuel 54 is lifted to a height at which the fuel 54 can be mounted.

Then, the articulated arm 96 is driven and the gripper 9
The fuel 54 gripped in 8 is moved to a position directly above the fuel receiving base 25 of the fuel handling carriage 6.

When the detector (not shown) detects that the fuel 54 has reached the predetermined position of the fuel receiving tray 25, the telescopic mast 97 is extended and lowered until the fuel 54 comes into contact with the fuel receiving tray 25. When the detector (not shown) detects that the fuel 54 has come into contact with the fuel pedestal 25, the drive unit 3
7, the fixed arm 38 is closed, and the fuel 54 is held in a state where the fuel 54 is free to move in the gravity direction. When this holding work is completed, the telescopic mast 97 is extended until the fuel 54 is completely placed on the fuel pedestal 25, and when it is detected that the fuel 54 is completely placed, the drive device 37 is activated to operate the fuel. The fixing arm 38 is closed until 54 is completely fixed. After that, the fuel gripping state at the tip of the telescopic mast 97 is released, the multi-joint arm 96 is driven, the gripping device 98 is taken directly above the fuel 54 mounted on the tray of the fuel relay device 81, and then taken out. Stand by for fuel 54.

When the fuel gripping state at the tip of the telescopic mast 25 is released and the grip 98 at the tip of the telescopic mast 25 is retracted, the drive device 35 causes the assembled gear 36 to work, and the arm mechanism 3 is moved.
3 is rotated around the axis of the column 22, and the fuel gripping mechanism 41 is moved right above the fuel 54. Activate the drive 44,
The wire winding device 43 is driven through the assembled gear 45, the wire 42 is unwound, the fuel gripping mechanism 41 is lowered, and the hanging metal fitting 55 of the fuel 54 is gripped.
5 backs up the retention of fuel 54 when traveling.

Thereafter, the fuel 54 is loaded on the fuel rack 2 in the same procedure as in the second embodiment. Then, the fuel 54 is taken out of the core 101 by repeating these operations. The loading of the fuel 54 on the core 101 is performed in the reverse order of the above.

According to the second modified example as described above, the fuel take-out period is reduced by about 280 seconds per fuel. This is equivalent to the fact that the extraction period can be shortened to about half that of the conventional method. And, in particular, there is an advantage that the multi-joint arm device 94 can be easily waterproofed and a hydraulic drive device can be adopted.

(Third Modification) In this modification, the first traveling carriage 110 traveling on the orbit of the operation floor 103 above the reactor pressure vessel 100 and the orbit of the operation floor 103 above the fuel storage pool 102. The first or second traversing carriage 112, 113 having the first or second multi-stage telescopic masts 132, 133 mounted thereon is traversed on the second traveling carriage 111 traveling above, so that the reactor pressure vessel 100 and the core. A fuel relay device 81 which rotates in the circumferential direction is installed between the shroud 104 and the shroud 104, and the fuel is handled underwater by the cooperative operation of these devices.

In the third modification, the lid of the reactor pressure vessel 100 is removed, the first multi-stage telescopic mast 132 is attached to the first traveling carriage 110 on the operation floor 103, and the reactor is installed above the reactor core 101. Move and second
The second multi-stage telescopic mast 133 is attached to the traveling carriage 111 and the fuel 54 of the fuel relay device 81 is moved right above the tray to complete the preparation for the fuel handling work.

Next, the fuel 54 is transferred from the core 101 to the fuel rack 2 of the fuel storage pool 102. That is, the first traveling carriage 110 is set to the fuel 54 for taking out the core 101.
The fuel gripping tool attached to the tip of the first multi-stage telescopic mast 132, the mast is extended until it is located above the fuel 54 to be taken out, and the lifting metal fitting 55 for the fuel 54 is attached.
After gripping, the fuel 54 is lifted from the top of the core 101 to a certain height position. The first traveling carriage 111 and the first traverse carriage 112 are caused to travel and traverse, and the first multistage telescopic mast 132 is brought directly above the tray for the fuel 54 of the fuel relay device 81. Then, the mast of the first multi-stage telescopic mast 132 is extended, and the fuel 54 is fed to the fuel relay device 81.
To load.

When the loading is finished, the first traveling carriage 110
Then, the first traverse carriage 112 is caused to travel and traverse, and is moved to the position of the core 101 where the fuel 54 to be taken out next is located. When the gripped state of the fuel 54 of the first multi-stage telescopic mast 132 is released, the rotating frame 84 of the fuel relay device 81 is rotated by the drive device 86, and the second traveling carriage 111 is moved to the second position.
Second multi-stage telescopic mast 13 mounted on the horizontal carriage 113 of
Move to a position where the lifting work in 3 can be performed.

The second traveling carriage 111 and the second traverse carriage 113 are caused to travel and traverse, and the second multi-stage telescopic mast 133 is moved directly above the fuel 54 of the fuel relay device 81. The second multi-stage telescopic mast 133 mounted on the second traverse carriage 113 of the second traveling carriage 111 is extended and the grip 9
If you grab the fuel 54 at 8, you can put the fuel 54 into the fuel storage pool 1
The fuel 54 is lifted to a height at which it can be transferred laterally to 02.

The second traveling vehicle 111 is the fuel storage pool 1
When traveling to 02, the second traversing carriage 113 is traversed so that the fuel 54 can pass through the canal 7, and the second traveling carriage 111 is passed through the canal 7 to pass through the fuel storage pool 102.
Move above. Then, the second traveling carriage 111 and the second traverse carriage 113 are made to travel and traverse, and the second multi-stage telescopic mast 1 is located directly above a predetermined position of the fuel rack 2.
The fuel 3 grabbed at 33 is moved. When it is confirmed by the sensor or the image information (not shown) that the second multi-stage telescopic mast 133 has come to the predetermined position of the fuel rack 2,
The second multi-stage telescopic mast 133 is extended and the fuel 54 is inserted into the fuel rack 2.

When it is confirmed by the sensor (not shown) that the fuel rack 2 has landed, the second multistage telescopic mast 1
The gripped state of the fuel 54 at the tip of 33 is released, and the second multistage telescopic mast 133 is contracted. The second traveling carriage 111 and the second traverse carriage 133 are made to travel and traverse, pass through the canal 7, and the second multistage telescopic mast 133 is arranged directly above the tray for the fuel 54 of the fuel relay device 81. Hereinafter, by repeating these operations, the fuel 54 is removed from the core 101.
Take out from. The loading of the fuel 54 on the core 101 is
Reverse the above steps.

According to the above third modified example, the following effects can be obtained.

Regarding the time required to take out one fuel 54, in the conventional method, as shown in FIG. 9, it takes about 2 times to go up and down (a-b-c-d) above the reactor pressure vessel 100.
About 20 seconds (A = 100 seconds, B = 50 seconds, C = 70 seconds)
It takes about 40 seconds to traverse (d to e) (D = 40 seconds)
It takes about 50 seconds (E = 5) to make a round trip (e to f) from above the reactor pressure vessel 100 to the fuel storage pool 102.
It takes about 0 second), about 150 seconds (G = 150 seconds) to go up and down (g to h) for mounting on the fuel rack 2 above the fuel storage pool 102, and about 80 seconds to traverse (f to g). (F = 80 seconds), and it takes about 540 seconds in total.

On the other hand, in the case of this modification, the fuel handling work cycle (ab, d, e) above the reactor pressure vessel 100 and the fuel storage pool from above the reactor pressure vessel 100. Round trip up to 102 (a-b-c-d,
e-f) and fuel handling work above the fuel storage pool 102 (f-g-h) cycles in parallel. The cycle (ab, b, d to e) for transferring the fuel 54 from the core 101 to the fuel relay device 81 is about 120 seconds as in the second embodiment. In addition, the cycle (a-b-c-d, e-f-g-h) for transferring the fuel 54 from the fuel relay device 81 to the fuel rack 2 is the fuel above the reactor pressure vessel 100 of the conventional method. Approximately 5 in which approximately 40 seconds of traverse (d to e) movements were reduced in the handling work of 54
It is about 00 seconds. The cycle criticality when this modification is adopted is that the fuel relay device 81 to the fuel rack 2
The cycle (a-b-c-d, e-f-g-h) is about 500 seconds, and the fuel extraction period is reduced by about 40 seconds in terms of one fuel. This corresponds to a fuel extraction period of 13/14 of the conventional method.

(Fourth Modification) In this modification, the first traveling carriage 110 traveling on the orbit of the operation floor 103 above the reactor pressure vessel 100 and the orbit of the operation floor 103 above the fuel storage pool 102. At least one of the first or second transverse carriages 112, 113 equipped with the first or second multi-stage telescopic masts 132, 133 is traversed on the second traveling carriage 111 traveling above, and at least one of them is traversed. A fuel relay device 81 that rotates in the circumferential direction is installed between the reactor pressure vessel 100 and the core shroud 104, and the fuel is handled underwater by the cooperative operation of these.

The operation of the fourth modification is essentially the same as that of the third modification, but differs in the following points. That is, a plurality of fuels 54 are simultaneously hung from the core 101 and are simultaneously transferred and loaded to the fuel relay device 81, and a plurality of fuels 54 are simultaneously hung from the fuel relay device 81 and are simultaneously transferred and loaded to the fuel rack 2. The points are different.

According to such a fourth modified example, the following effects can be obtained.

Regarding the time taken to take out one fuel 54, in the conventional method, as shown in FIG. 9, it takes about 2 times to go up and down (a-b-c-d) above the reactor pressure vessel 100.
About 20 seconds (A = 100 seconds, B = 50 seconds, C = 70 seconds)
It takes about 40 seconds to traverse (d to e) (D = 40 seconds)
It takes about 50 seconds (E = 5) to make a round trip (e to f) from above the reactor pressure vessel 100 to the fuel storage pool 102.
It takes about 0 second), about 150 seconds (G = 150 seconds) to go up and down (g to h) for mounting on the fuel rack 2 above the fuel storage pool 102, and about 80 seconds to traverse (f to g). (F = 80 seconds), and it takes about 540 seconds in total.

On the other hand, in the case of the fourth modified example, the fuel handling work cycle (ab, d, e) above the reactor pressure vessel 100 and the fuel storage from above the reactor pressure vessel 100. Round trip to pool 102 (a-b-c-d,
e-f) and fuel handling work above the fuel storage pool 102 (f-g-h) cycles in parallel. In the cycle (ab, b, d to e) in which the fuel 54 is transferred from the core 101 to the fuel relay device 81, when two first traverse carriages 112 are used, the first embodiment of the second embodiment described above is used.
It is about 60 seconds, which is / 2.

Further, from the fuel relay device 81 to the fuel rack 2
The cycle for transferring the fuel 54 to the fuel tank is performed in the traverse (d) in the conventional method of handling the fuel 54 above the reactor pressure vessel 100.
~ E) A reduction effect of about 40 seconds of work and the second traverse trolley 1
It is about 250 seconds due to the reduction effect of about 250 seconds due to the parallel work effect of the two 13 units. The cycle criticality when this modification is adopted is the cycle (a to b to c to d, e to f) from the fuel relay device 81 to the fuel rack 2.
~ G ~ h) of about 250 seconds, and the fuel extraction period is reduced by about 290 seconds in terms of one fuel 54. This corresponds to a reduction of the fuel extraction period of 5/11 of the conventional method.

(Fifth Modification) This modification is the first or second multistage telescopic mast 132, 1 of the fourth modification.
A link type expansion / contraction mechanism is attached to the mast at the tip end of 33, and the fuel is handled underwater by the coordinated operation of various devices as in the fourth modification.

The operation of the fifth modification is essentially the same as that of the fourth modification, but differs in the following points. That is, when a plurality of fuels 54 are simultaneously lifted from the core 101 and simultaneously transferred to and loaded in the fuel relay device 81, the fuel tray position of the fuel relay device 81 and the relative position of the first traveling carriage 110 can be set freely. The range becomes wider, and the range of the degree of freedom in setting the relative position of the fuel traveling mechanism 81 and the second traveling carriage 111 when the plurality of fuels 54 are simultaneously lifted from the fuel relay mechanism 81 becomes wider.
The difference is that the movement time for performing these operations is shortened.

According to such a fifth modification, the fourth
Similar to the modification, the fuel extraction period is reduced by about 290 seconds in terms of per fuel 54, which can be shortened to about 5/11 of the conventional method. In addition to the case of the four modified examples, the fuel relay device 8
In a work plan for simultaneously loading or unloading a plurality of fuels into one, there is a large degree of freedom in the relative relationship between the position of the traveling carriage and the fuel pan position of the fuel relay device 81, which facilitates the plan and widens the operation range. Is obtained.

(Sixth Modification) In this modification, the fuel rack 2 installed in the fuel storage pool 102 in the fifth modification is divided into two parts in a direction parallel to the second traveling carriage 113, and installed. Similar to the fifth modification, the fuel is handled underwater by the coordinated operation of various devices.

The operation of the sixth modification is essentially the same as that of the fifth modification, but differs in the following points. That is, a plurality of second traveling vehicles that traverse over the second traveling carriage 111
2 is different in that the traverse carriage 113 can move to a predetermined position of the fuel rack 2 without interfering with it, and can simultaneously load the fuel 54.

According to such a sixth modified example, the fifth
Similar to the modification, the fuel take-out period is reduced by about 290 seconds in terms of per fuel 54, and the fuel take-out period can be shortened to about 5/11 of the conventional method. Since there is no interference between the plurality of second traverse carriages 113 when the fuel 54 is loaded into the vehicle, the work plan for simultaneously loading the fuel can be facilitated and the operation range can be expanded.

(Seventh Modification) In this modification, a dashpot to which an electrorheological fluid is applied is used in the fuel support portion of the fuel rack 2 in the fourth modification, and the same manner as in the fourth modification.
The fuel is handled underwater by the coordinated operation of various devices.

The operation of the seventh modification is essentially the same as that of the fourth modification, but differs in the following points. That is, the difference is that the ascending / descending time is shortened by increasing the ascending / descending speed when the fuel 54 is loaded on the fuel rack 2 or by shortening the ascending / descending distance at a low speed.

According to such a seventh modified example, the following effects can be obtained.

Regarding the time required to take out one fuel 54, in the conventional method, as shown in FIG. 9, it takes about 2 times to move up and down (a-b-c-d) above the reactor pressure vessel 100.
About 20 seconds (A = 100 seconds, B = 50 seconds, C = 70 seconds)
It takes about 40 seconds to traverse (d to e) (D = 40 seconds)
It takes about 50 seconds (E = 5) to make a round trip (e to f) from above the reactor pressure vessel 100 to the fuel storage pool 102.
It takes about 0 second), about 150 seconds (G = 150 seconds) to go up and down (g to h) for mounting on the fuel rack 2 above the fuel storage pool 102, and about 80 seconds to traverse (f to g). (F = 80 seconds), and it takes about 540 seconds in total.

On the other hand, in the case of the seventh modification, the fuel handling work cycle (a) above the reactor pressure vessel 100 is
-B, d-e) and the reciprocation from above the reactor pressure vessel 100 to the fuel storage pool 102 (a-b-c-d, e-).
f), and the fuel handling work above the fuel storage pool 102 (f-g-h) can be separated into parallel work cycles. The cycle (ab, b, d to e) for transferring the fuel 54 from the core 101 to the fuel relay device 81 is about 60 seconds, which is 1/2 of that in the second embodiment described above, when two first traverse carriages 112 are used. Is.

Further, from the fuel relay device 81 to the fuel rack 2
The fuel transfer cycle to the fuel cell is performed by using two second traverse carriages 113, so that the operation of handling the fuel 54 above the reactor pressure vessel 100 in the conventional method is performed in comparison with the traverse (d to e) operation. In addition to being able to reduce the time by 40 seconds, the time required for raising and lowering (g to h) for mounting on the fuel rack 8, which is an effect achieved by adopting the present invention, can be reduced to the conventional time ( (G = 150 seconds), it can be reduced to about 1/2, and the lifting time can be reduced by about 70 seconds. Further, the parallel work of the second traverse carriage 113 has a reduction effect of about 215 seconds. It can be about 215 seconds.

The criticality of the cycle when this example is adopted is about 215 seconds in the cycle from the fuel relay device 81 to the fuel rack 2 (a to b to c to d, e to f to g to h), The fuel extraction period is reduced by about 325 seconds in terms of the fuel 54 per body, which corresponds to the fuel extraction period of about 2/5 of the conventional method.

(Eighth Modification) In this modification, the rotary frame 84 of the fuel relay device 81 in the third modification is floated by water pressure, and as in the third modification, the fuel is submerged by the cooperative operation of various devices. I deal with it.

The operation of the eighth modification is essentially the same as that of the third modification, but is different in the following points. That is, the driving force of the driving device 86 can be reduced, and the battery or the like can be made non-cable. Also, by making the driving force hydraulic, it is not necessary to use a large amount of electric power, and it is not necessary to consider a watertight structure. In this case, a battery is sufficient for power for signal transmission, operation control, measurement and the like.

According to the eighth modified example, as in the third modified example, the fuel extraction period is reduced by about 40 seconds in terms of per fuel 54, and the fuel extraction period is reduced to about 13% of that of the conventional method.
This is equivalent to being able to shorten the fuel extraction period to about 14 minutes. The eighth modification is different from the third modification in that
Since the rotary frame 84 of the fuel relay device 81 is floated by water pressure, the driving force required for rotation can be small, the battery can be driven, the cable can be removed, and the handling is easy. In addition, when water drive is adopted, there is no need to make a watertight structure, the structure becomes simple, and signal transmission, control,
The power for measurement becomes battery equipment and the system becomes simple.

(Ninth Modification) In this modification, a traversing carriage having a multi-stage telescopic mast attached to a traveling carriage that travels on the orbit of the operation floor 103 above the reactor pressure vessel 100 and above the fuel storage pool 102. The fuel is handled in water by a cooperative operation such as mounting and transferring the fuel 54 from the core 101 to the fuel rack 2 provided with the dash pot 116 applying the electrorheological fluid 120 to the fuel tray 117. .

The operation of the ninth modification is essentially the same as that of the conventional fuel handling method and apparatus, but the dashpot 116 to which the electrorheological fluid 120 is applied is used for the fuel tray 117 of the fuel rack 2. Can handle fuel underwater.

Therefore, the loading time of the fuel 54 to the fuel rack 2 in the conventional method can be shortened by about 70 seconds as in the seventh modification. This is about 7 / of the conventional method.
This is equivalent to being able to shorten the fuel extraction period to about eight.

Embodiment 3 (FIGS. 16 to 20) In this embodiment, on the first traveling carriage 110 traveling on the orbit of the operation floor 103 above the fuel pressure pool 100 from above the reactor pressure vessel 100. Is traversed by a first traverse carriage 112 to which a first multi-stage telescopic mast 132 is attached, and the reactor pressure vessel 100 and the core shroud 104 are
A fuel relay device 81 that rotates in the circumferential direction is installed between the second traveling carriage 1 that travels on the track 142 of the reactor pit 1.
2nd multi-stage telescopic mast 133 is attached on top of 11
The traverse carriage 113 is traversed and the fuel is handled underwater by the cooperative operation of these.

FIG. 16 is a plan view showing a state in which fuel is taken out using the first and second multistage telescopic masts 132 and 133 in this embodiment, and FIG. 17 is a diagram showing the fuel using the third stage telescopic mast 73. FIG. 18 is a plan view showing a state of taking out fuel, FIG. 18 is a plan view showing a state of taking out fuel using the second multistage telescopic mast 132, and FIG. 19 is a longitudinal sectional view showing a state of taking out fuel using a fuel relay device. 20 is a plan view showing a state in which fuel is taken out using the articulated arm device 94. FIG.

As shown in FIG. 16, in the present embodiment, the first traveling carriage 11 traveling on the operation floor 103.
0 and a first multi-stage telescopic mast 132 mounted on a first traverse vehicle 112 and an operation floor 1
No. 2 traversing truck 1 traversing above the second traveling truck 111 traveling on the truck 142 laid on the floor surface of the reactor pit 1 along the direction orthogonal to the truck 141 laid on No. 03.
The fuel 54 is handled by the second multi-stage telescopic mast 133 mounted on the unit 13.

Further, as shown in FIG. 17, the first multistage telescopic mast 132 mounted on the first traverse vehicle 112 traversing the first traveling carriage 110 traveling on the operation floor 103, and the operation. A second traveling on a track 142 laid on the floor of the reactor pit 1 along a direction orthogonal to the track 141 laid on the floor 103;
The fuel 54 is handled by the second and third multi-stage telescopic masts 133 and 145 mounted on the second and third traverse carriages 113 and 144 traversing the third traveling carriages 111 and 143. There is.

Further, as shown in FIG. 18, the first multi-stage telescopic mast 132 mounted on the first traveling carriage 112 that traverses the first traveling carriage 110 traveling on the operation floor 103, and the operation. Floor 103
Mounted on a second traverse carriage 113 that traverses a second traveling carriage 111 that travels on a rail 142 laid on the floor of the reactor pit 1 along a direction parallel to the rail 14 The fuel 54 is handled by the second multi-stage telescopic mast 133.

Furthermore, as shown in FIG. 19, the first traveling vehicle 11 traveling on the operation floor 103.
0, and a first multi-stage telescopic mast 132 mounted on a first transverse carriage 112 and an operation floor 1
No. 2 running on a track 142 laid on the floor of the reactor pit 1 along a direction parallel to the track 14 laid on No. 03
Second traverse carriage 113 traversing the traveling carriage 111 of
The fuel 54 is handled by the second multi-stage telescopic mast 133 mounted on the fuel cell and the fuel relay device 81 installed between the reactor pressure vessel 100 and the core shroud 104.

As shown in FIG. 20, the first multi-stage telescopic mast 132 mounted on the first traveling carriage 112 that traverses the first traveling carriage 110 traveling on the operation floor 103, and the atom. The fuel 54 is handled by a plurality of articulated arm devices 94 installed on the floor of the furnace pit 1.

Next, the operation of this embodiment will be described.

First, the lid of the reactor pressure vessel 100 was removed, and the track 14 laid on the floor of the reactor pit 1.
The second traveling carriage 111 is hung with an overhead crane in 2
The second transverse carriage 113 and the second multi-stage telescopic mast 133 are hung and installed thereon by an overhead crane. The first traverse vehicle 112, in which the first multi-stage telescopic mast 132 is attached to the first traveling carriage 110 for fuel handling, is moved right above the tray for the fuel 54 of the fuel relay device 81 to prepare for fuel handling work. finish.

Next, the procedure for transferring the fuel 54 from the core 101 to the fuel rack 2 of the fuel storage pool 102 will be described.

The second traveling carriage 111 is moved to the vicinity of the fuel 54 for taking out the core 101, and the fuel gripping tool attached to the tip of the second multistage telescopic mast 133 is placed on the fuel 54 to be taken out. Stretch out. After grasping the suspending metal 55 for the fuel 54, the fuel 54 is lifted from the top of the core 101 to a certain height position.

Then, the second traveling vehicle 111 and the second traveling vehicle 111
The traverse carriage 113 is moved and traversed, and the second multistage telescopic mast 133 is brought right above the tray for the fuel 54 of the fuel relay device 81. The mast of the second multi-stage telescopic mast 133 is extended and the fuel 54 is loaded into the fuel relay device 81. When the loading is completed, the second traveling carriage 111 and the second traverse carriage 113 are caused to travel and traverse, and are moved to the position of the core 101 where the fuel 54 to be taken out next is located.

When the gripped state of the fuel 54 on the second multistage telescopic mast 133 is released, the rotary frame 8 of the fuel relay device 81 is released.
4 is rotated by the drive device 86, and the multi-stage telescopic mast 132 mounted on the first transverse carriage 112 of the first traveling carriage 110 is mounted.
Move it to a position where the lifting work cycle is minimized.

The first traveling carriage 110 and the first traversing carriage 112 are caused to travel and traverse, and the first multistage telescopic mast 132 is moved directly above the fuel 3 of the fuel relay device 81.
When the first multi-stage telescopic mast 132 mounted on the first transverse carriage 112 of the first traveling carriage 110 is extended and the fuel 54 is gripped by the gripping tool, the fuel 54 can be laterally transferred to the fuel storage pool 102. The fuel 54 is lifted up to a certain height. The first traverse vehicle 112 is traversed so that the fuel 54 traveling to the fuel storage pool 102 of the first traveling vehicle 110 can pass through the canal 7, and the first traveling vehicle 110 is passed through the canal 7 to pass through the fuel storage pool. Move above 102.

Next, the first traveling carriage 110 and the first traveling carriage 110
Of the traverse truck 112 of the fuel rack 2
The fuel 54 grasped by the first multi-stage telescopic mast 132 is moved to a position right above the predetermined position. When it is confirmed that the first multistage telescopic mast 132 has come to a predetermined position of the fuel rack 2 based on the sensor or the image information (not shown),
The first multi-stage telescopic mast 132 is extended and the fuel 54 is inserted into the fuel rack 2.

When it is confirmed by sensor information (not shown) that the fuel rack 2 has landed, the gripped state of the fuel 54 at the tip of the first multi-stage telescopic mast 132 is released, and the first multi-stage telescopic mast is released. Shrink 132. First traveling carriage 110
Then, the first traverse carriage 112 is made to travel and traverse, the canal 7 is passed, and the first multi-stage telescopic mast 132 is arranged directly above the tray of the fuel 3 of the fuel relay device 81.

After that, by repeating these operations, the fuel 54 is taken out from the core 101. The loading of the fuel 54 on the core 101 is performed in the reverse order of the above.

According to the third embodiment described above, the following effects are obtained.

With respect to the time taken to take out one fuel 54, in the conventional method, as shown in FIG. 9, it takes about 2 times to go up and down (a-b-c-d) above the reactor pressure vessel 100.
About 20 seconds (A = 100 seconds, B = 50 seconds, C = 70 seconds)
It takes about 40 seconds to traverse (d to e) (D = 40 seconds)
It takes about 50 seconds (E = 5) to make a round trip (e to f) from above the reactor pressure vessel 100 to the fuel storage pool 102.
It takes about 0 second), about 150 seconds (G = 150 seconds) to go up and down (g to h) for mounting on the fuel rack 2 above the fuel storage pool 102, and about 80 seconds to traverse (f to g). (F = 80 seconds), and it takes about 540 seconds in total.

On the other hand, in the case of the third embodiment, the fuel handling work cycle (a
-B, d-e) and the reciprocation from above the reactor pressure vessel 100 to the fuel storage pool 102 (a-b-c-d, e-).
f), and the fuel handling work above the fuel storage pool 102 (f-g-h) can be separated into parallel work cycles. Fuel 54 from the core 101 to the fuel relay device 81
The cycle (a-b, d-e) for transferring the same is about 120 seconds as in the first embodiment of the second invention. Further, the fuel transfer cycle from the fuel relay device 81 to the fuel rack 2 (a-b-c-d, e-f-g-h) is performed by handling the fuel 54 above the reactor pressure vessel 100 according to the conventional method. About 40 seconds of the traversing (d to e) operation is reduced to about 500 seconds.

The criticality of the cycle when this embodiment is adopted is about 500 of the cycle from the fuel relay device 81 to the fuel rack 2 (a to b to c to d, e to f to g to h).
This is about a second, and the fuel removal period is reduced by about 40 seconds in terms of one fuel 54. This corresponds to a fuel extraction period of 13/14 of the conventional method.

(First Modification) In this modification, the first traveling carriage 110 traveling on the orbit of the operation floor 103 from above the reactor pressure vessel 100 to above the fuel storage pool 102 is first A plurality of first traverse carriages 112 to which the multi-stage telescopic mast 132 is attached are traversed, and a fuel relay device 81 that rotates in the circumferential direction is installed between the reactor pressure vessel 100 and the core shroud 104, and the reactor pit 1 A second traversing carriage 113 having a second multi-stage telescopic mast 133 mounted thereon is traversed on the second traveling carriage 111 traveling on the track 142 of the above, and the fuel is handled underwater by the cooperative operation of these. Is.

The operation of the first modification as described above is essentially the same as that of the third embodiment, but a plurality of fuels 54 are simultaneously lifted from the fuel relay device 81, and simultaneously transferred and loaded on the fuel rack 2. The points are different.

According to such a first modification example, the following effects can be obtained.

Regarding the time taken to take out one fuel 54, in the conventional method, as shown in FIG. 9, it takes about 2 times to move up and down (a-b-c-d) above the reactor pressure vessel 100.
About 20 seconds (A = 100 seconds, B = 50 seconds, C = 70 seconds)
It takes about 40 seconds to traverse (d to e) (D = 40 seconds)
It takes about 50 seconds (E = 5) to make a round trip (e to f) from above the reactor pressure vessel 100 to the fuel storage pool 102.
It takes about 0 second), about 150 seconds (G = 150 seconds) to go up and down (g to h) for mounting on the fuel rack 2 above the fuel storage pool 102, and about 80 seconds to traverse (f to g). (F = 80 seconds), and it takes about 540 seconds in total.

On the other hand, in the case of this first modification,
Fuel handling work cycle (ab, d, e) above the reactor pressure vessel 100 and reciprocation (abc to cd, e) from above the reactor pressure vessel 100 to the fuel storage pool 102.
~ F), and a fuel handling work (fgh) cycle above the fuel storage pool 102 in parallel. The transfer cycle of the fuel 3 from the core 101 to the fuel relay device 81 is about 120 seconds, which is the same as in the first embodiment of the second invention.

Further, from the fuel relay device 81 to the fuel rack 2
Transfer cycle (a-b-c-d, e-f-g-
h) is due to the reduction effect of the traversing (d to e) operation of about 40 seconds in the operation of handling the fuel 54 above the reactor pressure vessel 100 of the conventional method, and the use of the two first traverse carriages 112. With a reduction effect of about 250 seconds, it is about 250 seconds. The cycle criticality when this example is adopted is
Cycle from the fuel relay device 81 to the fuel rack 2 (a
-B-c-d, e-f-g-h) is about 250 seconds, and the fuel extraction period is reduced by about 290 seconds in terms of one fuel 54. This is 5 / of the conventional method
This is equivalent to being able to shorten the fuel extraction period to 11.

(Second Modification) In this modification, the top stage of the first traveling carriage 110 traveling on the orbit of the operation floor 103 from above the reactor pressure vessel 100 to above the fuel storage pool 102 is provided. A fuel that rotates in the circumferential direction between the reactor pressure vessel 100 and the core shroud 104 by traversing a plurality of first traverse carriages 112 to which a first multi-stage telescopic mast 132 having a link type telescopic mechanism attached to the mast is mounted. The relay device 81 is installed and the orbit 14 of the reactor pit 1 is installed.
The second traveling carriage 113 mounted with the second multi-stage telescopic mast 133 is made to traverse on the second traveling carriage 111 which travels on 2, and the fuel is handled underwater by the cooperative operation of these. is there.

The operation of the second modification is essentially the same as that of the first modification, but differs in the following points. Ie 2
Since the link type expansion / contraction mechanism that holds the fuel at the tip of the first multi-stage telescopic mast 132 mounted on the first transverse carriage 112 of the pedestal can be arranged in a line in the traveling direction, it is easy to pass the canal 7. Is different.

According to the second modified example, as in the first modified example, the fuel extraction period is reduced by about 290 seconds in terms of per fuel 54. This corresponds to a fuel extraction period of about 5/11 that of the conventional method. However, unlike the first modification, it is easy to arrange the link type expansion / contraction mechanisms that hold the fuel at the tip of the first multi-stage expansion / contraction mast 132 mounted on the two first transverse carriages 112 in a line in the traveling direction. The canal 7 can be passed through and the driving becomes easy.

(Third Modification) In this modification, the first stage trolley 110 traveling on the orbit of the operation floor 103 from above the reactor pressure vessel 100 to the fuel storage pool 102 is located at the tip stage. A plurality of first traverse carriages 112 equipped with a first multi-stage telescopic mast 132 having a link-type telescopic mechanism attached to the mast are traversed, and the reactor pressure vessel 1
00 and the core shroud 104, a fuel relay device 81 that rotates in the circumferential direction is installed, and the orbit 14 of the reactor pit 1 is installed.
A second traverse vehicle 113 having a second multi-stage telescopic mast 133 attached thereto is traversed on a second traveling bogie 111 traveling on 2 to divide the fuel rack 2 installed in the fuel storage pool 102 into two parts. It is installed and the fuel is handled underwater by these cooperative operations.

The operation of the third modification is essentially the same as that of the second modification, but differs in the following points. That is, since the fuel racks 2 installed in the fuel storage pool 102 are installed in two parts, the plurality of first traverse carriages 112 traversing over the first traveling carriage 110 do not interfere with each other and the fuel The difference is that it can be moved into position on the rack 2 and thus can be loaded with fuel 54 at the same time.

According to the third modification, as in the second modification, the fuel extraction period can be shortened by about 290 seconds in terms of per fuel 54. This corresponds to a fuel extraction period of about 5/11 that of the conventional method. However, unlike the second modification, the fuel storage pool 1
The fuel rack 2 installed in No. 02 is installed in two, so that a plurality of first racks 110 are installed on the first traveling carriage 110.
In the work of traversing the traverse vehicle 112 of the above and loading a plurality of fuels 54 on the fuel rack 2 at the same time, the work plan can be easily created because the interference between the first traverse vehicles 112 does not occur, and the operation range is expanded. .

(Fourth Modification) In this modification, the first traveling carriage 110 traveling on the orbit of the operation floor 103 above the fuel pressure pool 100 from above the reactor pressure vessel 100 The first transverse carriage 112 attached with the multi-stage telescopic mast 132 is made to traverse, and the reactor pressure vessel 1
00 and the core shroud 104, a fuel relay device 81 that rotates in the circumferential direction is installed, and the orbit 142 of the reactor pit 1 is installed.
A plurality of second and third traveling carriages 111, 1 traveling above
43 above the second and third multi-stage telescopic mast 133,145
The second and third traversing carriages 113 and 144 to which the above-mentioned is attached are traversed, and the fuel is handled underwater by the cooperative operation of these.

The operation of the fourth modification is essentially the same as that of the third embodiment, but there are a plurality of traveling carriages traveling on the track 142 of the reactor pit 1, and the region for handling the fuel 54 of the core 101. It is different in that the work is assigned to each traveling carriage.

According to this fourth modified example, the following effects can be obtained.

Regarding the time required to take out one fuel 54, in the conventional method, as shown in FIG. 9, it takes about 2 times to go up and down (a-b-c-d) above the reactor pressure vessel 100.
About 20 seconds (A = 100 seconds, B = 50 seconds, C = 70 seconds)
It takes about 40 seconds to traverse (d to e) (D = 40 seconds)
It takes about 50 seconds (E = 5) to make a round trip (e to f) from above the reactor pressure vessel 100 to the fuel storage pool 102.
It takes about 0 second), about 150 seconds (G = 150 seconds) to go up and down (g to h) for mounting on the fuel rack 2 above the fuel storage pool 102, and about 80 seconds to traverse (f to g). (F = 80 seconds), and it takes about 540 seconds in total.

On the other hand, in the case of the fourth modification,
Fuel handling work cycle (ab, d-e) above the reactor pressure vessel 100, and reciprocation (abc-d, e) from above the reactor pressure vessel 100 to the fuel storage pool 102.
~ F) and the fuel handling work above the fuel storage pool 102 (f ~ g ~ h) cycles in parallel. In the cycle (ab, b, d to e) for transferring the fuel 54 from the core 101 to the fuel relay device 81, a plurality of second and third traveling carriages 111 and 143 are used to perform a third cycle.
Since it has an effect of halving that of the embodiment, it takes about 60 seconds.

Further, from the fuel relay device 81 to the fuel rack 2
Transfer cycle (a-b-c-d, e-f-g-
h) is the reactor pressure vessel 100 as in the third embodiment.
It is about 500 seconds due to the effect of reducing the traverse (d to e) operation by about 40 seconds in the operation of handling the fuel 54 above.

The cycle criticality when this modification is adopted is about 500 cycles (a to b to c to d, e to f to g to h) from the fuel relay device 81 to the fuel rack 2.
This is about a second, and the fuel removal period is reduced by about 40 seconds in terms of one fuel 54. This corresponds to a fuel extraction period of 13/14 of the conventional method.

(Fifth Modification) In this modification, the first stage carriage 110, which travels on the orbit of the operation floor 103 from above the reactor pressure vessel 100 to above the fuel storage pool 102, is located at the tip stage. A plurality of first traverse carriages 112, each having a first multi-stage telescopic mast 132 having a link type telescopic mechanism attached to the mast, are traversed and rotated in the circumferential direction between the reactor pressure vessel 100 and the core shroud 104. The fuel relay device 81 is installed and the orbit 1 of the reactor pit 1
A plurality of second and third traveling carriages 11 traveling on 42
The first and second multi-stage telescopic masts 133,
Second and third traverse carriages 113 and 144 to which 134 is attached
And the fuel rack 2 installed in the fuel storage pool 102 is divided into two parts, and the fuel is handled underwater by the cooperative operation of these parts.

The operation of the fifth modification is essentially the same as that of the fourth modification, but there are a plurality of traveling vehicles traveling on the track 142 of the reactor pit 1, and an area for handling the fuel 54 of the reactor core 101. Since the work is assigned to each traveling carriage, the work can be performed without considering the mutual interference.

According to the fifth modification, the fuel handling work cycle (ab, d, d) above the reactor pressure vessel 100 is performed.
e), the reciprocation from above the reactor pressure vessel 100 to the fuel storage pool 102 (a to b to c to d, e to f), and the fuel handling work cycle above the fuel storage pool 102 (f to g to h). ) Parallel work can be separated. The cycle (a to b, d to e) for transferring the fuel 54 from the core 101 to the fuel relay device 81 uses the plurality of second and third traveling carriages 111 and 143, and thus the third invention It has the effect of halving the cycle of the third modification, which is about 60 seconds.

Further, from the fuel relay device 81 to the fuel rack 2
Transfer cycle (a-b-c-d, e-f-g-
h) is due to the reduction effect of the traversing (d to e) operation of about 40 seconds in the operation of handling the fuel 54 above the reactor pressure vessel 100 of the conventional method and the use of the two first traverse carriages 112. The reduction effect of about 250 seconds results in about 250 seconds.

The criticality of the cycle when this example is adopted is about 250 seconds in the cycle (a to b to c to d, e to f to g to h) from the fuel relay device 81 to the fuel rack 2, The fuel take-out period is reduced by about 290 seconds in terms of per fuel 54. This corresponds to a reduction of the fuel extraction period of 5/11 of the conventional method.

(Sixth Modification) In this modification, the electrorheological fluid 12 is added to the fuel tray 121 of the fuel rack 2 of the fifth modification.
As in the fourth modification of the third invention, the dashpot 116 to which 0 is applied is used to handle the fuel 54 underwater by the coordinated operation of various devices.

The operation of the sixth modified example is essentially the same as that of the fifth modified example, except that the ascending / descending speed when the fuel 54 is loaded on the fuel rack 2 is increased or the ascending / descending distance at a low speed is increased. The difference is that the lifting time can be shortened by shortening it.

According to the sixth modification, the fuel handling work cycle (ab, d, d) above the reactor pressure vessel 100 is performed.
e), the reciprocation from above the reactor pressure vessel 100 to the fuel storage pool 102 (a to b to c to d, e to f), and the fuel handling work above the fuel storage pool 102 (f to g).
~ H) can be separated into parallel work of cycles. The cycle (a to b, d to e) of transferring the fuel 54 from the core 101 to the fuel relay device 81 is a cycle of the fifth modification by using a plurality of second and third traveling carriages 111 and 143. Has an effect of halving, and is about 60 seconds.

Further, from the fuel relay device 81 to the fuel rack 2
Transfer cycle (a-b-c-d, e-f-g-
h) shows the effect of reducing the traverse (d to e) operation of about 40 seconds in the operation of handling the fuel 54 above the reactor pressure vessel 100 of the conventional method and the effect expected by adopting this example. The time for lifting (g to h) for mounting on the fuel rack 2 is reduced to about 1/2 by minimizing the low speed operation distance.
By shortening to about 70 seconds, the lifting time is reduced by about 70 seconds, and by using the two first traverse carriages 112, the reduction effect is reduced by about 215 seconds, resulting in about 215 seconds.

The criticality of the cycle when this example is adopted is about 215 seconds in the cycle from the fuel relay device 81 to the fuel rack 2 (a to b to c to d, e to f to g to h), The fuel take-out period is reduced by about 325 seconds in terms of per fuel 54. This corresponds to a fuel extraction period of about 2/5 that of the conventional method.

(Seventh Modification) In this modification, the first traveling carriage 110 traveling on the track of the operation floor 103 above the fuel pressure pool 100 from above the reactor pressure vessel 100 A first traverse vehicle 112 equipped with a multi-stage telescopic mast 132 is traversed, a circumferentially rotating fuel relay device 81 is installed between the reactor pressure vessel 100 and the core shroud 104, and operated on the floor of the reactor pit 1. Second traveling carriage 11 traveling on a track 142 laid parallel to the track 141 laid on the floor 103
The second traverse carriage 113 mounted with the second multi-stage telescopic mast 133 mounted on the No. 1 is traversed, and the fuel is handled underwater by the cooperative operation of these.

The operation of the seventh modification is essentially the same as that of the third embodiment, except for the following points. That is,
The second mounted on the second traverse carriage 113 that traverses the second traveling carriage 111 that travels on the rail 142 laid on the floor of the reactor pit 1 in parallel with the rail 141 laid on the operation floor 103. Multi-stage telescopic mast 133
The difference is that the fuel 54 is transferred from the core 101 to the fuel relay device 81.

According to the seventh modification, the same effect as that of the third embodiment can be obtained. The criticality of the cycle when this example is adopted is about 50 in the cycle from the fuel relay device 81 to the fuel rack 2 (a to b to c to d, e to f to g to h).
The time is about 0 seconds, and the fuel extraction period is reduced by about 40 seconds in terms of one fuel 54. This corresponds to a fuel removal period of about 13/14 of the conventional method.

(Eighth Modification) In this modification, the electrorheological fluid 12 is added to the fuel tray 117 of the fuel rack 2 of the seventh modification.
Using the dashpot 116 to which 0 is applied, a plurality of traverse carriages 112 are mounted on the first traverse carriage 110, and a plurality of traverse carriages 113 are also mounted on the second traveling carriage 111.
Is mounted, and the other parts handle fuel in water by the coordinated operation of various devices as in the third embodiment of the third invention.

The operation of the eighth modification is essentially the same as that of the seventh modification, but is different in the following points. That is, by increasing the ascending / descending speed when the fuel 54 is loaded on the fuel rack 2 or shortening the distance for ascending / descending at a low speed,
The difference is that the ascending / descending time is shortened, a plurality of fuels are simultaneously transferred from the core 101 to the fuel relay device 81, and a plurality of fuels are simultaneously transferred from the fuel relay device 81 to the fuel rack 2.

According to the eighth modification, the fuel handling work cycle (ab, b, d ...) Above the reactor pressure vessel 100 is performed.
e), the reciprocation from above the reactor pressure vessel 100 to the fuel storage pool 102 (a to b to c to d, e to f), and the fuel handling work above the fuel storage pool 102 (f to g).
~ H) can be separated into parallel work of cycles. The cycle (a to b, d to e) for transferring the fuel 54 from the core 101 to the fuel relay device 81 is 1 / third of that of the third embodiment by using a plurality of second traverse carriages 113.
It has an effect of 2 and is about 60 seconds.

Further, from the fuel relay device 81 to the fuel rack 2
Transfer cycle (a-b-c-d, e-f-g-
h) shows the effect of reducing the traverse (d to e) operation of about 40 seconds in the operation of handling the fuel 54 above the reactor pressure vessel 100 of the conventional method and the effect expected by adopting this example. The time for lifting (g to h) for mounting on the fuel rack 2 is reduced to about 1/2 by minimizing the low-speed operation distance.
It is about 215 seconds due to the effect of reducing the ascending / descending time by about 70 seconds by shortening to a certain extent and the effect of reducing by about 215 seconds by using the two first traverse carriages 112.

The criticality of the cycle when this example is adopted is about 215 seconds of the cycle (a to b to c to d, e to f to g to h) from the fuel relay device 81 to the fuel rack 2. The fuel take-out period is reduced by about 325 seconds in terms of per fuel 54. This is equivalent to being able to shorten the fuel extraction period to 2/5 that of the conventional method.

(Ninth Modification) In this modification, the first multistage expansion / contraction is performed on the first traveling carriage 110 traveling on the orbit of the operation floor 103 from above the reactor pressure vessel 100 to the fuel storage pool 102. The first traverse truck 112 with the mast 132 attached is traversed to move the reactor pressure vessel 10
No. 0 and the core shroud 104, a fuel relay device 81 that rotates in the circumferential direction is installed, and a plurality of articulated arm devices 94 are installed on the floor surface of the reactor pit 1. I deal with it.

The operation of the ninth modification is essentially the same as that of the third embodiment except for the following points. That is,
A plurality of articulated arm devices 94 are installed on the floor surface of the reactor pit 1, and the articulated arms 96 are driven to set the telescopic mast 97 to the reactor core 1.
The fuel 54 at a predetermined position of 01 is moved to a position right above the fuel 54, and the fuel 54 is gripped by the grip attached to the tip of the telescopic mast 97. The fuel 54 is contracted and the fuel 54 is lifted from the top of the core 101 to a certain height position. Then, the articulated arm 96 is driven to place the telescopic mast 97 directly above the fuel tray of the fuel relay mechanism 81, and after the position is confirmed by a detector (not shown), the telescopic mast 97 is extended to 54 is placed on the fuel tray of the fuel relay mechanism 81. Further, when landing is confirmed by a detector (not shown), the gripping state of the fuel 54 by the gripping tool at the tip of the telescopic mast 97 is released, and the articulated arm 9
6 differs in that the expansion mast 97 is driven directly above the reactor core 101 with the fuel 54 to be taken out.

According to the ninth modification, the same effect as that of the third embodiment can be obtained.

The criticality of the cycle when this example is adopted is about 500 seconds in the cycle from the fuel relay device 81 to the fuel rack 2 (a to b to c to d, e to f to g to h), The fuel extraction period is reduced by about 40 seconds in terms of one fuel 54. This corresponds to a fuel removal period of about 13/14 of the conventional method. In this example, unlike the third example, the multiple articulated arm devices 94 transfer fuel from the core 101 to the fuel relay device 81 with a certain range of the core 101 as a work area, so that mutual interference is small. Can be carried out in the state Therefore, a work plan can be easily created and operational safety can be easily ensured.

(Tenth Modification) In this modification, the first multistage expansion / contraction is performed on the first traveling carriage 110 traveling on the orbit of the operation floor 103 from above the reactor pressure vessel 100 to the fuel storage pool 102. The first traverse vehicle 112 with the mast 132 attached is traversed to the reactor pressure vessel 1
00 and the core shroud 104, a fuel relay device 81 that rotates in the circumferential direction is installed, a plurality of articulated arm devices 94 are installed on the floor surface of the reactor pit 1, and the fuel rack 2 on the floor surface of the reactor pit 1 is installed. A track 14 is provided on the upper surface of the frame body 3 of No. 1, and a plurality of fuel handling carriages 6 are run on the track 14.
The fuel is handled underwater by these coordinated operations.

The operation of this tenth modification is essentially the same as that of the seventh embodiment.
It is similar to the modification, but differs in the following points. That is,
As in the above-described first embodiment, the orbit switching device 10 and the evacuation orbit cradle 8 are installed by suspending them in the fuel storage pool 102 with an overhead crane, and a plurality of trolleys 15 are provided with the fuel handling trolleys 6 mounted thereon. The evacuation track base 8 track 11
Prepared for fuel handling by suspending and installing it on the ceiling with an overhead crane.
In step 4, the fuel 54 is transferred from the core 101 to the fuel relay device 81, and the fuel is transferred from the fuel relay device 81 by the first multistage telescopic mast 132 attached to the first traversing carriage 112 that traverses the first traveling carriage 110. The fuel 54 is transferred to the handling trolley 6, the fuel handling trolley 6 is moved onto the fuel rack 2, and the fuel 54 is loaded at a predetermined position on the fuel rack 2.

Therefore, according to the tenth modification,
Regarding the time required to take out one fuel 54, in the conventional method, as shown in FIG.
About 220 seconds (A-b-c-d) to move up and down (A
= 100 seconds, B = 50 seconds, C = 70 seconds), traverse (d to e) takes about 40 seconds (D = 40 seconds), and a round trip from above the reactor pressure vessel 100 to the fuel storage pool 102 ( e to f) takes about 50 seconds (E = 50 seconds),
About 150 seconds (G = 150) for ascending / descending (g to h) for mounting on the fuel rack 2 above the fuel storage pool 102.
It takes about 80 seconds to traverse (f to g) (F = 80).
It takes about 540 seconds in total.

On the other hand, in the case of this example, the fuel handling work cycle above the reactor pressure vessel 100 (ab, b,
d-e), ascending / descending above the reactor pressure vessel 100 (a-b)
˜c˜d), reciprocating from above the reactor pressure vessel 100 to the fuel storage pool 102 (e to f), and separating fuel handling work above the fuel storage pool 102 (f to gh) in parallel work cycles. can do. Cycle of transferring the fuel 54 from the core 101 to the fuel relay device 81 (a to
b, d to e) have the effect of being ¼ of that of the third embodiment by using four multi-joint arm devices 94, and are about 30 seconds. From the fuel relay device 81 to the fuel handling traveling vehicle 6
The cycle (a-b-c-d) for transferring the fuel 54 to
It is about 220 seconds in the conventional case. A plurality of round trips (e to f to g) from the reactor pressure vessel 100 to the fuel storage pool 102 and a plurality of fuel handling work cycles (g to h) above the fuel storage pool 102 are about 220 seconds. A fuel handling traveling vehicle 6 is used.

The cycle criticality when this example is adopted is about 80 seconds in the cycle from the core 101 to the fuel relay device 81, and the fuel extraction period is about 320 seconds per fuel 54. Shortened. This is equivalent to being able to shorten the fuel extraction period to 2/5 that of the conventional method.

(Eleventh Modification) In this modification, the first multistage expansion / contraction is performed on the first traveling carriage 110 traveling on the orbit of the operation floor 103 from above the reactor pressure vessel 100 to the fuel storage pool 102. A plurality of first traversing carriages 112 having masts 132 are traversed, and a fuel relay device 81 that rotates in the circumferential direction is installed between the reactor pressure vessel 100 and the core shroud 104, and the floor surface of the reactor pit 1 is installed. A plurality of articulated arm devices 94 are installed, a track 14 is provided on the floor surface of the reactor pit 1 and the upper surface of the frame 3 of the fuel rack 2, and a plurality of fuel handling carriages 6 are run on it. The fuel is handled underwater by these coordinated operations.

The operation of this 11th modification is essentially the same as that of the first embodiment.
0 is the same as the modified example, but is different in the following points. That is, since the plurality of first traversing carriages 112 having the first multi-stage telescopic masts 132 attached thereto are traversed on the first traveling carriage 110, the fuel relay device 81 causes a plurality of fuels 5 to flow.
4 is simultaneously transferred to the fuel handling traveling vehicle 6.

According to such an eleventh modification, substantially the same effect as that of the tenth modification can be obtained.

The criticality of the cycle when this example is adopted is from the fuel relay device 81 to the fuel handling traveling vehicle 6, but about 110 which is 1/2 of the cycle of the tenth modification.
This is about a second, and the fuel removal period is reduced by about 430 seconds in terms of one fuel 54. This corresponds to a fuel extraction period of about 1/7 that of the conventional method. However, unlike the tenth modification, a plurality of first traverse carriages 112 having the first multi-stage telescopic masts 132 attached thereto are traversed on the first traveling carriage 110,
Since a plurality of fuels 54 are simultaneously transferred from the fuel relay device 81 to the fuel handling traveling vehicle 6, the fuel relay device 81
The transfer time of the fuel 54 from the fuel handling traveling vehicle 6 to the fuel handling traveling vehicle 6 can be shortened, whereby the critical path of the tenth modification can be improved.

Embodiment 4 (FIGS. 21 to 23) In this embodiment, on the first traveling carriage 110 traveling on the orbit of the operation floor 103 above the reactor pressure vessel 100 and above the fuel storage pool 102. The first traverse vehicle 112 having the first multi-stage telescopic mast 132 attached thereto is traversed, the fuel relay device 151 rotating in the circumferential direction is installed on the upper surface of the core shroud 104, and travels on the track 142 of the reactor pit 1. The second traveling carriage 113 having the second multi-stage telescopic mast 133 attached thereto is traversed on the second traveling carriage 111, and the fuel is handled underwater by the cooperative operation of these.

FIG. 21 is a vertical cross-sectional view showing the fuel handling state in this embodiment, FIG. 22 is a detailed view of the inside of the core in the state shown in FIG. 21, and FIG. It is a longitudinal cross-sectional view showing a state of handling the.

As shown in FIG. 21, the first multi-stage telescopic mast 1 mounted on the traverse carriage 112 that traverses the first traveling carriage 110 traveling on the operation floor 103.
32 and the track 1 laid on the operation floor 103
Track 142 laid on the floor of the reactor pit 1 in parallel with 12
And a fuel relay device 151 installed on the upper surface of the core shroud 104 by a second multi-stage telescopic mast 133 mounted on a second traverse vehicle 113 traversing over the second traveling bogie 111 traveling above It is designed to handle fuel 54.

The fuel relay device 151 has the fuel 54
Can be loaded and unloaded, and a structure that can be rotated in the circumferential direction with the upper part of the core shroud 104 as a track is added to the lower part. That is, the fuel relay device 151 is installed by suspending it with an overhead crane before handling the fuel as a unit, and can be easily removed after the work is completed.

Further, as shown in FIG. 22, the first multi-stage telescopic mast 132 extended from the first traversing carriage 112 traversing the first traveling carriage 110 traveling on the operation floor 103, and the operation floor. A second traveling carriage 111 that travels on a track 142 laid on the floor of the reactor pit 1 in parallel with the track 141 laid on 130.
Using a second multi-stage telescopic mast 153 having a link mechanism 152 attached to the tip end mounted on a second traverse carriage 113 that traverses above, and a fuel relay device 154 and the like installed on the upper surface of the core shroud 104. , Handle fuel 54.

The fuel relay device 154 includes a drive device 155.
Is mounted, and the drive unit 155 is connected to the wheels 157 through the set gear 156. The wheels 157 are in rotary contact with the inner surface of the reactor pressure vessel 100. When the driving device 155 is driven, the wheels 157 move the reactor pressure vessel 1
The inner surface of 00 is rotated and moved in the circumferential direction, and at the same time, the fuel relay device 154 is moved in the circumferential direction. A tray 158 for holding the fuel 54 is attached, and a fluid pressure cushion chamber 159 (or a wheel assembly is attached) is formed in the lower portion of the fuel relay device 154 using the upper portion of the core shroud 104 as a guide. Fluid pressure cushion room 1
The water flow for forming 59 is supplied from the operation floor 103 via a fluid rotary joint (not shown). Fluid pressure can also be used to drive the drive 155.
And the fuel 54 can be accessed from above.

Then, as shown in FIG. 23, the first multi-stage telescopic mast 132 mounted on the first traveling carriage 112 that traverses the first traveling carriage 110 traveling on the operation floor 103, and the operation floor. The second traveling carriage 111 traveling on the track 142 laid on the floor of the reactor pit 1 in parallel with the track 141 laid on 103.
The second mounted on the second traverse carriage 113 that traverses above
Multi-stage telescopic mast 133, the fuel relay device 151 installed on the upper surface of the core shroud 104, and the fuel lifting device 82.
And the fuel handling traveling carriage 6 handle the fuel 54.

Next, the operation of this embodiment will be described.

First, the lid of the reactor pressure vessel 100 is removed, and the fuel relay device 154 is installed on the upper surface of the core shroud 104 by suspending it with an overhead crane. 2 trolleys 11
1 is suspended by an overhead crane, and the second traversing carriage 113 and the second multi-stage telescopic mast 133 are suspended by the overhead crane and installed thereon. First traveling trolley for fuel handling 1
The first transverse carriage 112 having the first multi-stage telescopic mast 132 attached to 10 is moved right above the tray 158 for the fuel 54 of the fuel relay device 151, and the preparation for the fuel handling work is completed.

Next, a procedure for transferring the fuel 54 from the core 101 to the fuel rack 2 of the fuel storage pool 102 will be described.

The second traveling carriage 111 is moved to the vicinity of the fuel 54 for taking out the core 101, and secondly, the fuel grip attached to the tip of the multistage telescopic mast 133 is placed on the fuel 54 to be taken out. Stretch out. After gripping the metal fitting 55 for the fuel 54, the fuel 54 is lifted to a position slightly higher than the top of the fuel relay device 151.

Then, the second traveling carriage 111 and the second traveling carriage 111
The traverse carriage 113 is moved and traverses, and the second multi-stage telescopic mast 133 is moved right above the tray 158 of the fuel 54 of the fuel relay device 151. Second multi-stage telescopic mast 13
The mast of No. 3 is extended, and the fuel 54 is loaded into the fuel relay device 151. When the loading is completed, the second traveling carriage 111 and the second traverse carriage 113 are caused to travel and traverse, and are moved to the position of the core 101 where the fuel 54 to be taken out next is located.

When the gripped state of the fuel 54 on the second multi-stage telescopic mast 133 is released, the drive device 155 attached to the fuel relay device 151 is driven to move the wheels 157 to the reactor pressure vessel 100 via the assembled gear 156. The fuel relay device 151 is rotated along the inner surface to rotate the fuel relay device 151, and
Is moved to the position closest to the fuel storage pool 102, and waits until the lifting operation is performed by the first multistage telescopic mast mounted on the first traversing carriage 112 of the first traveling carriage 110.

The first traveling carriage 110 and the first traverse carriage 112 are made to travel and traverse, and the first multi-stage telescopic mast 132 is moved directly above the fuel 54 mounted on the fuel relay device 151. The first multi-stage telescopic mast 132 mounted on the first transverse carriage 112 of the first traveling carriage 110 is extended, and the fuel 54 mounted on the fuel relay device 151 is grasped by a grip.
After gripping, the fuel 54 is lifted to a height (a position slightly higher than the floor surface position of the reactor pit 1) where the fuel 54 can be laterally transferred toward the fuel storage pool 102.

The first traveling carriage 110 is connected to the fuel storage pool 1
When traveling to 02, the first traverse vehicle 112 is traversed so that the fuel 54 can pass through the canal 7, and the first traveling bogie 110 is passed through the canal 7 so as to pass through the canal 7.
Move above. Then, the first traveling carriage 110 and the first traverse carriage 112 are made to travel and traverse, and the first multistage telescopic mast 1 is located right above a predetermined position of the fuel rack 2.
The fuel 54 grasped at 32 is moved.

When it is confirmed from the sensor or the image information (not shown) that the telescopic mast 132 has come to the predetermined position of the fuel rack 2, the first multistage telescopic mast 132 is extended, and the fuel 54 is loaded on the fuel rack 2. insert. Fuel rack 2
When it is confirmed by the sensor (not shown) information that the user has landed on the floor, the gripped state of the fuel 54 at the tip of the first multi-stage telescopic mast 132 is released, and the first multi-stage telescopic mast 132 is contracted.

[0260] The first traveling carriage 110 and the first traversing carriage 112 are made to travel and traverse, the canal 7 is passed through the telescopic mast 132, and the first multistage is provided just above the tray 158 of the fuel 54 of the fuel relay device 151. The telescopic mast 132 is moved. The fuel 54 is extracted from the core 101 by repeating these operations. The loading of the fuel 54 on the core 101 is performed in the reverse order of the above.

According to the fourth embodiment described above, the following effects can be obtained.

Regarding the time required to take out one fuel 54, as shown in FIG. 9, in the conventional method, about 22 times ascending / descending (a-b-c-d) above the reactor pressure vessel 100 is performed.
It takes about 0 seconds (A = 100 seconds, B = 50 seconds, C = 70 seconds), traverse (d to e) takes about 40 seconds (D = 40 seconds), and fuel is stored from above the reactor pressure vessel 100. About 50 seconds (E = 50) for round trip (e to f) to the pool 102
It takes about 150 seconds (G = 150 seconds) to move up and down (g to h) for mounting on the fuel rack 2 above the fuel storage pool 102, and about 80 seconds to traverse (f to g). (F = 80 seconds), it takes about 540 seconds in total.

On the other hand, in the case of Example 4, the core 1
Fuel handling work cycle above 01 (abc,
d to e), fuel handling work above the periphery of the core 101 (b to c to d), reciprocation from above the reactor pressure vessel 100 to the fuel storage pool 102 (e to f), and above the fuel storage pool 102 Fuel handling work (f ~ g ~ h)
Can be separated into parallel work of cycles. Cycle (a-b) for transferring the fuel 54 from the core 101 to the fuel relay device 151
-C, d-e), the traverse direction moving distance is about half compared to the conventional method, so that the traverse time can be reduced by about 20 seconds and the reactor pressure vessel 100 by the conventional method can be reduced. Equivalent to moving time in the up and down direction (A + B =
It is about 170 seconds (150 seconds).

Further, the fuel transfer cycle from the fuel relay device 151 to the fuel rack 2 (b to c to d, e to f to g).
h) is about 400 seconds (B + C + E + F + G) due to the reduction of the traverse time of about 40 seconds in the handling time of the fuel 54 above the reactor pressure vessel 100 of the conventional method and the reduction of the elevation time of about 100 seconds. = 400 seconds). The cycle criticality when this embodiment is adopted is the cycle from the fuel relay device 151 to the fuel rack 2 (b to c
d, e-f-g-h) for about 400 seconds, fuel 5
The fuel extraction period is shortened by about 140 seconds in terms of one body. This corresponds to the fact that the fuel extraction period of 5/7 of the conventional method can be shortened.

(First Modification) In this modification, the fluid pressure cushion chamber 159 of the fuel relay device 151 in the fourth embodiment is used.
To the core shroud 104, and a mechanism for floating the fuel relay device 151, which is installed in the upper surface of the core shroud 104 and rotates in the circumferential direction, by hydraulic pressure is added, and the fuel is handled underwater by the cooperative operation of various devices as in the fourth embodiment. It was done like this.

The operation of the first modification is basically the same as that of the fourth embodiment, but is different in the following points. That is, the fluid pressure cushion chamber 159 of the fuel relay device 151.
A water flow is supplied to the fuel relay device 151 to cause buoyancy utilizing water pressure while leaking from the gap in the guide portion on the upper surface of the core shroud 104.

According to the first modification as described above, as in the case of the fourth embodiment, the fuel extraction period is reduced by about 140 seconds per fuel. This is 5 of the conventional method.
This is equivalent to shortening the fuel extraction period to / 7. In the first modification, unlike the above-described embodiment, the fuel relay device 151 is levitated by water pressure, so that the power required for rotation may be small and battery drive is possible. Also,
The adoption of water drive eliminates the need for a watertight structure, which simplifies the structure, improves battery power supply for signal transmission, measurement, and control, and simplifies the system.

(Second Modification) In this modification, the first traveling carriage 110 traveling on the orbit of the operation floor 103 above the fuel pressure pool 100 from above the reactor pressure vessel 100 A plurality of first traversing carriages 112 to which the multistage telescopic mast 132 is attached are traversed, a fuel relay device 151 that rotates in the circumferential direction is installed on the upper surface of the core shroud 104, and travels on the track 142 of the reactor pit 1. The second multi-stage telescopic mast 1 is mounted on the traveling carriage 111 of No. 2
The second traverse carriage 113 to which 33 is attached is traversed, and the fuel is handled underwater by these coordinated operations.

The operation of the second modification is essentially the same as that of the fourth embodiment, except for the following points. That is, a different point is that a plurality of fuels 54 are simultaneously lifted from the fuel relay mechanism 151 and are simultaneously transferred and loaded on the fuel rack 2.

According to such a second modification example, the following effects can be obtained.

That is, regarding the time required to take out one fuel 54, as shown in FIG.
Ascending / descending above the reactor pressure vessel 100 (a-b-c-
d) about 220 seconds (A = 100 seconds, B = 50 seconds, C
= 70 seconds) and about 40 seconds (D to e) for traverse (D to e)
= 40 seconds), and it takes about 50 seconds (E = 50 seconds) to make a round trip (e to f) from above the reactor pressure vessel 100 to the fuel storage pool 102, and to the fuel rack 2 above the fuel storage pool 102. Approximately 1 for lifting (g ~ h) for wearing
It takes about 50 seconds (G = 150 seconds), traverse (f to g) takes about 80 seconds (F = 80 seconds), and takes about 540 seconds in total.

On the other hand, according to the second modification, the core 1
Fuel handling work cycle above 01 (abc,
d-e), fuel handling work above the periphery of the core 101 (b-c-d), reciprocation from above the reactor pressure vessel 100 to the fuel storage pool 102 (e-f), and in the fuel storage pool 102 Fuel handling work from above (f ~ g ~
h) Separation into parallel work of cycles. Transfer cycle of the fuel 54 from the core 101 to the fuel relay device 151 (a to
b to c, d to e) are about 170 as in Example 4.
It is about a second.

Further, the fuel transfer cycle from the fuel relay device 151 to the fuel rack 2 (b-c-d, e-f-g-).
h) is a reduction effect of the traverse time in the handling time of the fuel 54 above the reactor pressure vessel 100 by the conventional method of about 40 seconds, and the first traverse truck 112 in the fourth embodiment.
The reduction effect of about 200 seconds by using two units is about 200 seconds.

The cycle criticality when this second modification is adopted is that the fuel relay device 151 to the fuel rack 2
Up to about 2 cycles (b-c-d, e-f-g-h)
It will be about 00 seconds, converted to one fuel 54,
The fuel removal period is shortened by about 340 seconds. this is,
This is equivalent to being able to shorten the fuel extraction period to 4/11 of the conventional method.

(Third Modification) In this modification, the first traveling carriage 110 traveling on the orbit of the operation floor 103 above the fuel pressure pool 100 from above the reactor pressure vessel 100 A plurality of first traversing carriages 112 to which the multi-stage telescopic mast 132 is attached are traversed, a fuel relay device 151 that rotates in the circumferential direction is installed on the upper surface of the core shroud 104, and travels on the track 142 of the reactor pit 1. A plurality of second traverse carriages 113 to which the second multi-stage telescopic mast 133 is attached are traversed on the second traveling carriage 111, and the fuel is handled underwater by the cooperative operation of these.

The operation of the third modification is essentially the same as that of the second modification, but differs in the following points. That is, a plurality of second traversing carriages 113 traversing the second traveling carriage 111 traveling on the track 142 of the nuclear reactor pit 1 are provided, and work is performed by allocating regions for handling the fuel 54 of the core 101 to each of them. The difference is that I did it.

According to such a third modification example, the following effects can be obtained.

When this example is adopted, the fuel handling work cycle (a to b to c, d to e) above the core 101, the core 1
01 fuel handling work above (b-c-d), reciprocating from the reactor pressure vessel 100 up to the fuel storage pool 102 (e-f), and fuel handling work above the fuel storage pool 102 (f- g to h) can be separated into parallel work of cycles. Fuel 5 from the core 101 to the fuel relay device 151
The cycle of transferring 4 (a-b-c, d-e) is the second
By using two traversing carriages 113, the half of the second modified example is about 85 seconds.

Further, fuel transfer cycles (b-c-d, e-f-g-) from the fuel relay device 151 to the fuel rack 2 are carried out.
h) is about 200 seconds similar to the second modification. When the third modification is adopted, the cycle criticality is about 200 seconds in the cycle from the fuel relay device 151 to the fuel rack 2, and the fuel extraction period is about 340 in terms of per fuel 54. It is reduced by about a second.
This corresponds to the reduction of the fuel extraction period of 4/11 of the conventional method.

(Fourth Modification) In this modification, the electrorheological fluid 12 is added to the fuel tray 117 of the fuel rack 2 of the third modification.
Using the dashpot 116 which applied 0, this and the third
The fuel is handled underwater in cooperation with various devices of the modification.

The fourth action as described above is essentially the third action.
This is the same as the modification, but is different in that the ascending / descending time is shortened by increasing the ascending / descending speed when loading the fuel 54 on the fuel rack 2 or shortening the ascending / descending distance at a low speed.

According to such a fourth modification example, the following effects can be obtained.

When this example is adopted, the fuel handling work cycle (a to b to c, d to e) above the core 101, the core 1
01 fuel handling work above (b-c-d), reciprocating from the reactor pressure vessel 100 up to the fuel storage pool 102 (e-f), and fuel handling work above the fuel storage pool 102 (f- g to h) can be separated into parallel work of cycles. Fuel 5 from the core 101 to the fuel relay device 151
The cycle of transferring 4 (a to b to c, d to e) is the third cycle.
It is about 85 seconds as in the modified example.

Further, the fuel transfer cycle from the fuel relay device 151 to the fuel rack 2 (b-c-d, e-f-g-).
h) is a reduction of the time required for traversing (d to e) within the handling time (260 seconds) of the fuel 54 above the reactor pressure vessel 100 of the conventional method of about 40 seconds, and lifting (a to a). By reducing the time required for b) by about 100 seconds and adopting this fourth modification, the lifting (g) for mounting on the fuel rack 2 (g
~ H) is reduced to about 1/2 (conventionally, G = 150 seconds) by minimizing the low-speed travel distance. With the use of two traverse carriages 112, a reduction of about 165 seconds results in about 165 seconds. Further, the cycle criticality when this fourth modification is adopted is the cycle (b to c) from the fuel relay device 151 to the fuel rack 2.
~ D, e-f-g-h) for about 165 seconds, and the fuel extraction period is about 375 in terms of one fuel 54.
It is reduced by about a second. This corresponds to a fuel extraction period of about 3/10 of the conventional method.

(Fifth Modification) In this modification, the operation floor 103 extends from the reactor pressure vessel 100 to the fuel storage pool 102 to the fuel storage pool 102.
First traverse vehicle 112 having the first multi-stage telescopic mast 132 mounted on the first traveling bogie 110 traveling on the track
And a fuel relay device 154 that rotates in the circumferential direction on the upper surface of the core shroud 104, can receive fuel from the lateral direction, and can take fuel from the upper surface, and runs on the track 142 of the reactor pit 1. A second traverse carriage 113 equipped with a second multi-stage telescopic mast 133 in which a link type telescopic mechanism is attached to a mast at the tip end stage on the second traveling bogie 111.
Is traversed, and the fuel is handled underwater by these coordinated operations.

The operation of the fifth modified example is essentially the same as that of the first modified example, except for the following points. That is, the fuel 54 taken out from the core 101 is fueled by the link-type expansion / contraction mechanism 152 of the mast at the tip end of the second multi-stage telescopic mast 153 attached to the second traverse vehicle 113 traversing over the second traveling bogie 111. The relay device 154 is laterally loaded, and the fuel 54 is suspended from the upper side of the fuel relay device 154 by the first multistage telescopic mast 132 attached to the first traverse vehicle 112 that traverses over the first traveling carriage 110. The transfer to the fuel rack 2 is different.

According to such a fifth modified example, the following effects can be obtained.

When this example is adopted, the fuel handling work cycle (ab, d, e) above the core 101, the core 101
Fuel handling work above the periphery (b to c to d), round trip from the reactor pressure vessel 100 above to the fuel storage pool 102 (e to f), and fuel handling work above the fuel storage pool 102 (f to g) ~ H) can be separated into parallel work of cycles. Fuel 54 from the core 101 to the fuel relay device 154
In the transfer cycle (a to b, d to e), the lateral movement distance (d to e) is about half that of the conventional method, so that the traverse time can be reduced by about 20 seconds and the conventional method. It is about 120 seconds, which is equivalent to the moving time in the ascending / descending direction above the reactor pressure vessel 100 (A = 100 seconds).

Further, the fuel transfer cycle from the fuel relay device 154 to the fuel rack 2 (b-c-d, e-f-g-).
h) is about 400 seconds, which is the same as in the first modification. The cycle criticality when this example is adopted is the cycle from the fuel relay device 154 to the fuel rack 2 (b to c
d, e-f-g-h) for about 400 seconds, fuel 5
The fuel extraction period is shortened by about 140 seconds in terms of one body. This corresponds to the fact that the fuel extraction period of 5/7 of the conventional method can be shortened.

(Sixth Modification) In this modification, the first multistage expansion / contraction is performed on the first traveling carriage 110 traveling on the orbit of the operation floor 103 from above the reactor pressure vessel 100 to the fuel storage pool 102. A plurality of first traversing carriages 112 to which the masts 132 are mounted are traversed, and are rotated in the circumferential direction on the upper surface of the core shroud 104 so that fuel can be received from the lateral direction and fuel can be taken out from the upper surface. And a second multi-stage telescopic mast 153 in which the link type telescopic mechanism 152 is attached to the mast at the tip end stage on the second traveling carriage 111 traveling on the track 142 of the reactor pit 1. The traverse carriage 113 is traversed and the fuel is handled underwater by these coordinated operations.

The operation of the sixth modification is essentially the same as that of the fifth modification, except for the following points. That is, the fuel 54 taken out from the core 101 is fueled by the link-type expansion / contraction mechanism 152 of the mast at the tip end of the second multi-stage telescopic mast 153 attached to the second traverse vehicle 113 traversing over the second traveling bogie 111. The first multi-stage telescopic mast 1 mounted on the plurality of first traversing carriages 112 that are loaded laterally on the relay device 154 and traverse over the first traveling carriage 110.
32, a plurality of fuels 54 are simultaneously hung from the upper side of the fuel relay device 151 and transferred to the fuel rack 2.

According to such a sixth modification example, the following effects can be obtained.

When this example is adopted, the fuel handling work cycle (ab, d, e) above the core 101, the core 101
Fuel handling work above the periphery (b to c to d), round trip from the reactor pressure vessel 100 above to the fuel storage pool 102 (e to f), and fuel handling work above the fuel storage pool 102 (f to g) ~ H) can be separated into parallel work of cycles. Fuel 54 from the core 101 to the fuel relay device 154
The transfer cycle (a to b, d to e) is about 120 seconds as in the second modification.

Further, fuel transfer cycles (b to c to d, e to f to g) from the fuel relay device 154 to the fuel rack 2 are carried out.
h) shows that if two first traverse trucks 112 are adopted,
It is half that of the modified example, which is about 200 seconds. The cycle criticality when this example is adopted is the cycle from the fuel relay device 154 to the fuel rack 2 (b to c to d,
e-f-g-h) is about 200 seconds, and the fuel take-out period is reduced by about 340 seconds in terms of per fuel 54. This corresponds to the reduction of the fuel extraction period of 4/11 of the conventional method.

(Seventh Modification) In this modification, the electrorheological fluid 12 is added to the fuel tray 117 of the fuel rack 2 of the sixth modification.
Using the dashpot 116 to which 0 is applied, a plurality of second traversing carriages 113 having the second multi-stage telescopic masts 153 attached thereto are traversed on the first traveling carriage 111, and various types of this and the sixth modified example. The fuel is handled underwater by the cooperative operation with the device.

The operation of the seventh modification is essentially the same as that of the sixth modification, except for the following points. That is, the dashpot 1 to which the electrorheological fluid 120 is applied
16 is used to increase the ascending / descending speed when the fuel 54 is loaded into the fuel rack 2 or to shorten the ascending / descending distance at a low speed to shorten the ascending / descending time, and a plurality of second traverse trolleys. The core 101 is connected to the core 101 by the link type expansion mechanism 152 of the mast at the tip end of the second multi-stage expansion mast 153 attached to 113.
A plurality of fuels 54 taken out simultaneously from the fuel relay device 1
54 is loaded from the side.

According to such a seventh modified example, the following effects can be obtained.

When this example is adopted, the fuel handling work cycle (ab, d, e) above the core 101, the core 101
Fuel handling work above the periphery (b to c to d), round trip from the reactor pressure vessel 100 above to the fuel storage pool 102 (e to f), and fuel handling work above the fuel storage pool 102 (f to g) ~ H) can be separated into parallel work of cycles. Fuel 54 from the core 101 to the fuel relay device 154
The transfer cycle (a to b, d to e) is 1 of the sixth modification.
It becomes / 2, which is about 60 seconds.

Further, fuel transfer cycles (b to c to d, e to f to g) from the fuel relay device 154 to the fuel rack 2 are carried out.
h) shows the effect expected by adopting this example for the reduction effect of the sixth modification, the time for lifting (g to h) for mounting on the fuel rack, and minimizing the low-speed operation distance. It is about 165 seconds by adding a reduction effect of about 70 seconds by shortening to about 1/2. The criticality of the cycle when this example is adopted is that the cycle from the fuel relay device 154 to the fuel rack 2 (b
~ C-d, e-f-g-h) takes about 165 seconds,
The fuel extraction period is about 3 per fuel 54.
It is reduced by about 75 seconds. This corresponds to shortening the fuel extraction period to 3/10 of the conventional method.

(Eighth Modification) In this modification, the first multistage telescopic mast 132 is mounted on the first traveling carriage 110 traveling on the track of the operation floor 103 above the fuel storage pool 102. 1 traverses the traverse vehicle 112 and rotates in the circumferential direction on the upper surface of the core shroud 104,
A fuel relay device 154 capable of taking out fuel from the lateral side and the upper surface is installed, and a link type telescopic mechanism is attached to a mast at the tip end stage on the second traveling carriage 111 traveling on the track 142 of the reactor pit 1. The second traverse carriage 113 equipped with the multi-stage telescopic mast 133 of 2 is traversed, the track 4 is provided on the floor of the reactor pit 1 and the gantry installed in the fuel storage pool 102, and a plurality of fuel handling runs on it. The trolley | bogie 6 is made to drive, the fuel raising / lowering apparatus 82 is installed in the floor surface of the nuclear reactor pit 1, and fuel is handled underwater by cooperation operation | movement of these.

The operation of the eighth modified example is essentially the same as that of the fifth modified example, except for the following points. That is, the fuel handling traveling vehicle 6 and the fuel elevating device 82 are installed by suspending them on an orbit installed on the floor of the reactor pit 1 with an overhead crane to prepare for fuel handling, and the second traveling vehicle 111 Second traverse trolley 11 traversing above
The fuel is transferred from the core 101 to the fuel relay device 151 by the link type telescopic mechanism to the mast at the tip end of the second multistage telescopic mast 133 mounted on the No. 3, and the fuel 54 is lifted from the fuel relay device 154 by the fuel lifting device 82. The fuel handling traveling vehicle 6 is loaded, and the fuel handling traveling vehicle 6 is loaded into the fuel storage pool 2.
The second point is that the first multi-stage telescopic mast 132 mounted on the traversing carriage 112 traversing the first traveling carriage 110 is transferred from the fuel handling traveling carriage 6 to the fuel rack 2.

According to such an eighth modified example, the following effects can be obtained.

When this example is adopted, the fuel handling work cycle (ab, d, e) above the core 101, the core 101
Fuel handling work above the periphery (b to c to d), round trip from above the reactor pressure vessel 100 to the fuel storage pool 2 (e
~ F) and the fuel handling work (fgh) above the fuel storage pool 2 can be separated into parallel work cycles. The transfer cycle (ab, b, d to e) of the fuel 54 from the core 101 to the fuel relay device 151 is about 1 as in the fifth modification.
It takes about 20 seconds.

Further, the transfer cycle of the fuel 54 from the fuel relay device 151 to the fuel handling traveling vehicle 6 (b to c to d).
Is about 120 seconds when the one having the same capability (B + C = 120 seconds) as the moving time in the ascending / descending direction above the reactor pressure vessel 100 of the conventional method is adopted. Fuel transfer cycle from the periphery of the core 101 to the fuel storage pool 120 (e ~
In f), a plurality of fuel-handling traveling carriages 6 are used for about 120 seconds. The fuel transfer cycle (f to g to h) from the fuel handling carriage 6 to the fuel rack 2 is about 230 seconds like the cycle above the fuel storage pool 102 in the conventional method. When the present example is adopted, the criticality of the cycle is about 230 seconds in the cycle (f to g to h) above the fuel storage pool 102, which is 1 of the fuel 54.
The fuel extraction period is reduced by about 310 seconds in terms of per body. This corresponds to a fuel extraction period of about 5/12 of the conventional method.

(Ninth Modification) In this modification, the electrorheological fluid 12 is added to the fuel tray 117 of the fuel rack 2 of the eighth modification.
A plurality of second traverse carriages 113 equipped with a second multi-stage telescopic mast 133 in which a link type telescopic mechanism is attached to a mast at the tip end of the second traveling bogie 111 using the dashpot 116 to which 0 is applied. The fuel storage pool 1
02, a plurality of first traversing carriages 112 having the first multi-stage telescopic masts 132 mounted thereon are traversed on the first traveling carriage 110 traveling on the orbit of the operation floor 103 above the No. 02, and these and the eighth modification. The fuel is handled underwater in cooperation with various devices in the example.

The operation of the ninth modification is essentially the same as that of the eighth modification, except for the following points. That is, the dashpot 1 to which the electrorheological fluid 120 is applied
16 to increase the ascending / descending speed when the fuel 54 is loaded on the fuel rack 2 or to shorten the ascending / descending distance at a low speed to shorten the ascending / descending time, Simultaneously transferring the fuel 54 of
The difference is that a plurality of fuels 54 are simultaneously transferred from the fuel handling traveling vehicle 6 to the fuel rack 2.

According to such a ninth modified example, the following effects can be obtained.

When this example is adopted, the fuel handling work cycle (ab, d, e) above the core 101, the core 101
Fuel handling work above the periphery (b to c to d), round trip from the reactor pressure vessel 100 above to the fuel storage pool 102 (e to f), and fuel handling work above the fuel storage pool 102 (f to g) ~ H) can be separated into parallel work of cycles.

In the transfer cycle (ab, b, d to e) of the fuel 54 from the core 101 to the fuel relay device 151, by adopting two second traverse carriages 113, 1/2 of the eighth modification is adopted. It takes about 60 seconds. Fuel relay device 151
Of the fuel 54 from the fuel handling traveling vehicle 6 to the fuel handling traveling vehicle 6 (b to c to d) is performed by the conventional reactor pressure vessel 1
It is about 60 seconds when the one having a capacity of twice the moving time in the up-and-down direction above 00 (B + C = 120 seconds) is adopted. A plurality of fuel handling traveling vehicles 6 are used so that the fuel transfer cycle (e to f) from the periphery of the core 101 to the fuel storage pool 102 is about 60 seconds.

The fuel transfer cycle (fg to h) from the fuel handling traveling vehicle 6 to the fuel rack 2 is about 230 seconds like the cycle above the fuel storage pool 102 of the conventional method. As a result, the time required for lifting (g to h) for mounting on the fuel rack with the expected effect is reduced to about 1/2 by minimizing the low-speed operation distance, thereby reducing the time by about 70 seconds. And, by adopting two first traverse carriages 112, a reduction of about 80 seconds results in about 80 seconds. The criticality of the cycle when this example is adopted is about 80 seconds of the cycle (f to g to h) above the fuel storage pool 102,
The fuel extraction period is about 4 per fuel 54
It is reduced by about 60 seconds. This corresponds to a reduction in the fuel extraction period of about 1/7 of the conventional method.

(Tenth Modification) In this modification, a first extension carriage 110, which travels on the orbit of the operation floor 103 above the reactor pressure vessel 100, is provided with a link type telescopic mechanism. The first traverse vehicle 112 equipped with the multi-stage telescopic mast 132 is traversed to move the fuel storage pool 10
The second traversing carriage 113 having the second multi-stage telescopic mast 133 mounted thereon is traversed on the second traveling carriage 111 traveling on the orbit of the operation floor 103 above 2, and is circumferentially arranged on the upper surface of the core shroud 104 in the circumferential direction. The fuel relay device 15 that rotates to the left and can take out the fuel 54 from the side and the upper surface.
4 is installed and the fuel is handled underwater by these coordinated operations.

The operation of the tenth modification is essentially the same as that of the fifth modification, but the first traveling carriage 110 is used.
And the second traveling carriage 111 is the operation floor 1
It is different in that it travels on the track No. 03 and handles the fuel 54 by extending the first multi-stage telescopic mast 132 and the second multi-stage telescopic mast 133.

According to such a tenth modified example, the following effects can be obtained.

When this example is adopted, the fuel handling work cycle (ab, d, e) above the core 101, the core 101
Fuel handling work above the periphery (b to c to d), round trip from the reactor pressure vessel 100 above to the fuel storage pool 102 (e to f), and fuel handling work above the fuel storage pool 102 (f to g) ~ H) can be separated into parallel work of cycles.

The transfer cycle (a to b, d to e) of the fuel 54 from the core 101 to the fuel relay device 154 is about 120 seconds as in the fifth modification. In addition, a fuel transfer cycle (b to c) from the fuel relay device 154 to the fuel rack 2 is performed.
-D, e-f-g-h) is about 40 as in the fourth embodiment.
It is about 0 seconds. The criticality of the cycle when this tenth modification is adopted is the fuel transfer cycle (b to c to d, e to f to g from the fuel relay device 154 to the fuel rack 2).
~ H) is about 400 seconds, and the fuel extraction period is reduced by about 140 seconds in terms of one fuel 54. This corresponds to a fuel extraction period of about 5/7 that of the conventional method.

(Eleventh Modification) In this modification, a dash pot 116 to which the electrorheological fluid 120 is applied is used for the fuel tray 117 of the fuel rack 2 of the tenth modification, and the operation floor above the reactor pressure vessel 100 is used. A plurality of first traversing carriages 112 equipped with a first multi-stage telescopic mast 132 having a link type telescopic mechanism are traversed on a first traveling carriage 110 traveling on a track 103, and the fuel storage pool 102 is A plurality of second traversing carriages 113 having the second multi-stage telescopic mast 133 mounted thereon are traversed on the second traveling carriage 111 traveling on the track of the upper operation floor 103, and various devices of the tenth modification are provided. The fuel is handled underwater by the coordinated operation of.

The operation of the eleventh modification is essentially the same as that of the tenth modification, except that a plurality of first traversing carriages 112 are made to traverse and a plurality of second traverse carriages 113 are made to traverse. The difference is that the ascending / descending time is shortened by increasing the ascending / descending speed when loading the fuel 54 on the fuel rack 2 or by shortening the ascending / descending distance at a low speed.

According to such an eleventh modified example, the following effects can be obtained.

When this example is adopted, the fuel handling work cycle (ab, d, e) above the core 101, the core 101
Fuel handling work above the periphery (b to c to d), round trip from the reactor pressure vessel 100 above to the fuel storage pool 102 (e to f), and fuel handling work above the fuel storage pool 102 (f to g) ~ H) can be separated into parallel work of cycles.

The transfer cycle of fuel 54 from the core 101 to the fuel relay device 154 (ab to d, d to e) is the first of the two units.
By adopting the traversing carriage 112, it is half that of the tenth modified example, which is about 60 seconds. In addition, a fuel transfer cycle (b to c) from the fuel relay device 154 to the fuel rack 2 is performed.
-D, e-f-g-h), the time for lifting (g-h) for mounting on the fuel rack 2 should be reduced to about 1/2 by minimizing the low-speed operation distance. The effect of shortening about 70 seconds by the two first traverse carriages 112
In addition to the effect of halving that of the tenth modification, it takes about 165 seconds. This eleventh
The cycle critical when the modification is adopted is the cycle (b to c) from the fuel relay device 154 to the fuel rack 2.
~ D, e-f-g-h) for about 165 seconds, and the fuel extraction period is about 375 in terms of one fuel 54.
It is reduced by about a second. This corresponds to a fuel extraction period of about 3/10 that of the conventional method.

Embodiment 5 (FIG. 24) In this embodiment, the first traveling trolley 110 traveling on the orbit of the operation floor 103 from above the reactor pressure vessel 100 to above the fuel storage pool 102 is first. The first traversing bogie 112 having the multi-stage telescopic mast 132 attached thereto is traversed, and the rotating bogie 161 rotating in the circumferential direction is installed on the upper surface of the core shroud 104, and the fuel elevating bogie 1 is mounted thereon.
62 and the fuel relay truck 163 are mounted, and the fuel is handled underwater by the cooperative operation of these.

As shown in FIG. 24, the first multi-stage telescopic mast 132 mounted on the first traveling carriage 112 that traverses the first traveling carriage 110 traveling on the operation floor 103, and the core shroud 104. A rotary carriage 161 that rotates in the circumferential direction is installed on the upper surface of the fuel tank, and a fuel lifting carriage 162 and a fuel relay carriage 163 are mounted thereon to handle the fuel 54. The rotary carriage 161 rotates in the circumferential direction on the upper surface of the core shroud 104 with the set wheels 164 working by the drive device mounted thereon.

The fuel lift truck 162 is provided with a support 167 having a built-in mechanism for moving up and down an arm mechanism 166 having a gripping tool 165 attached to the tip thereof, a drive unit 168 for running and raising and lowering the fuel 54, and a control unit. ing. The fuel relay truck 163 includes a fuel tray 169 and a fuel holding mechanism 1.
70, rotating column 171, rotating platform 172, traveling vehicle 173
And so on. A rotation support 171 and a rotation base 172 are attached to a support fixed to the traveling carriage 179, a fuel holding mechanism 170 is attached to the rotation support 171 and a fuel tray 169 is attached to the rotation support 171 and the rotation support 172. . Illustration of these drive devices is omitted.

The operation of the fifth embodiment will be described below.

First, the reactor pressure vessel 1 of the light water cooling reactor.
The lid of No. 00 is removed, and the rotary carriage 161 which rotates in the circumferential direction is installed by suspending it on the upper surface of the core shroud 104 with an overhead crane. And are suspended by an overhead crane. The first traverse vehicle 112 having the first multi-stage telescopic mast 132 mounted on the first traveling carriage 110 for fuel handling is moved to a position directly above the tray for the fuel 54 of the fuel relay truck 163 to carry out the fuel handling work. Finish the preparation.

Next, the procedure for transferring the fuel 54 from the core 101 to the fuel rack 2 of the fuel storage pool 102 will be described. The fuel lift truck 162 on the orbit of the rotary carriage 161 is attached to the core 10.
1 is moved to the vicinity of the fuel 54 to be taken out, and when the grasping tool 165 attached to the tip of the arm mechanism 166 is directly above the fuel 54 to be taken out, the arm mechanism 166 is supported by the support 16
7, the gripping tool 165 stops moving when the gripping tool 165 reaches a position where the hanging fitting 55 of the fuel 54 can be gripped. And
After grasping the hanging metal fitting 55 of the fuel 54 and confirming the grasped state with a detector (not shown), the arm mechanism 166 is raised along the support column 167, and the fuel receiving tray 169 of the fuel relay cart 163 is lifted.
Stop climbing at a position slightly higher than the top of. The portion of the fuel tray 169 of the fuel relay truck 163 on which the fuel 54 is not mounted is directed toward the fuel lift truck 162.

On the other hand, with the fuel holding mechanism 170 in an open state, the fuel relay truck 163 is moved to a position in contact with the fuel lift truck 162. Arm mechanism 16 of fuel lift truck 162
When it is confirmed that the fuel 54 grasped by the grasping tool 165 of No. 6 has come directly above the fuel tray 169 of the fuel relay truck 163 (confirmation device not shown), the arm mechanism 166 is supported by the column 167.
Then, the fuel 54 is loaded onto the fuel tray 169 of the fuel relay truck 163. Fuel 54 is fuel pan 16
After confirming that you have landed at 9 (confirmation device not shown),
Stop lowering the arm mechanism 166 along the column 167,
The fuel holding mechanism 170 is closed to hold it gently.

When it is confirmed that the holding work is completed (confirmation device not shown), the arm mechanism 166 is lowered again along the support column 167, and when it is confirmed that the load on the grip 165 is removed (confirmation device). (Not shown), the combined state of the grip 165 and the fuel 54 is set to the released state. When it is confirmed that the connection is released (confirmation device not shown), the arm mechanism 16
6 is slightly moved up along the column 167, and the fuel lift truck 1
62 is moved to the position of the fuel 54 to be taken out next.

At that time, the rotary carriage 161 is rotated,
The fuel relay truck 163 travels in a direction away from the fuel lift truck 162. Further, the rotary table 172 of the fuel lift truck 162 is rotated, the fuel tray 169 on which the fuel 54 is not mounted is directed toward the fuel lift truck 162, and the vehicle stands by to receive the next fuel 54 to be taken out.

First traveling carriage 1 of first traveling carriage 110
Extend the first multi-stage telescopic mast 132 mounted on 12,
When the fuel 54 mounted on the fuel relay device 163 is grasped by the grasping tool, the fuel 54 can be laterally transferred toward the fuel storage pool 102 (a position slightly higher than the floor surface position of the reactor pit 1). ) Up to 54). When the first traveling vehicle 110 travels to the fuel storage pool 102, the first traversing vehicle 112 is traversed so that the fuel 54 can pass through the canal 7, and the first traveling vehicle 110 passes through the canal 7 and the fuel is passed. Move above storage pool 102.

Then, the first traveling carriage 110 and the first traveling carriage 110
Of the traverse truck 112 of the fuel rack 2
The fuel 54 grasped by the first multi-stage telescopic mast 132 is moved to a position right above the predetermined position. When it is confirmed from the sensor or the image information (not shown) that the first multi-stage telescopic mast 132 has come to the predetermined position of the fuel rack 2, the first multi-stage telescopic mast 132 is extended and the fuel is stored in the fuel rack 2. 5
Insert 4. When the sensor (not shown) information confirms that the fuel rack 2 has landed, the gripped state of the fuel 54 at the tip of the first multi-stage telescopic mast 132 is released, and the first multi-stage telescopic mast 132 is contracted. First traveling carriage 110
And the first traverse vehicle 112 is made to travel and traverse, the canal 7 is passed through the telescopic mast 132, and the fuel relay cart 1
The first multistage telescopic mast 132 is moved right above the fuel receiving tray 169 of 63. After that, the fuel 54 is taken out from the core 101 by repeating these operations.
The loading of the fuel 54 on the core 101 is performed in the reverse order of the above.

According to the above fifth embodiment, the following effects can be obtained.

Regarding the time taken to take out one fuel, as shown in FIG. 9, in the conventional method, it takes about 220 seconds (A to b to c to d) to go up and down above the reactor pressure vessel 100 (A = 100 seconds, B = 50 seconds, C = 70 seconds), traverse (d to e) takes about 40 seconds (D = 40 seconds), and the fuel storage pool 10 is fed from above the reactor pressure vessel 100.
Approximately 50 seconds for round trip (e to f) up to 2 (E = 50 seconds)
It takes about 150 seconds (G =) to move up and down (g to h) for mounting on the fuel rack 2 above the fuel storage pool 102.
It takes about 150 seconds and about 80 seconds (F to g) for traverse (F to g).
= 80), and it takes about 540 seconds in total.

When this Embodiment 5 is adopted, the fuel handling work cycle (ab) above the core 101 and the core 10
1 Round trip from above to the fuel storage pool 102 (b-c-
d, e-f) and fuel handling work (f-g-h) cycles above the fuel storage pool 102 in parallel. Fuel 5 from the core 101 to the fuel relay truck 163
The cycle (a-b) for transferring 4 is equivalent to the moving time in the ascending and descending direction above the reactor pressure vessel 100 of the conventional method (A
= 100 seconds). Further, a fuel transfer cycle (b) from the fuel relay truck 163 to the fuel rack 2
~ C ~ d, e ~ f ~ g ~ h) are traversing (d) within the handling time of the fuel 54 above the reactor pressure vessel 100 of the conventional method.
~ E) about 40 seconds reduction and lifting (b ~ c)
~ D) It is about 400 seconds due to the reduction of about 100 seconds due to the shortened distance. The cycle criticality when the fifth embodiment is adopted is the cycle from the fuel relay truck 163 to the fuel rack 2 (b to c to d, e to f to g).
~ H) is about 400 seconds, and the fuel extraction period is reduced by about 140 seconds in terms of one fuel 54. This corresponds to a fuel extraction period of about 5/7 that of the conventional method.

(First Modification) In this modification, on the first traveling carriage 110 that travels on the orbit of the operation floor 103 above the reactor pressure vessel 100 and the fuel storage pool 102 in the fifth embodiment described above. A plurality of first transverse carriages 1 to which the first multi-stage telescopic mast 132 is attached.
12 is traversed, and the fuel is handled underwater by cooperative operation with other various devices.

The operation of the first modification as described above is essentially the same as that of the first embodiment of the fifth aspect of the invention, except that a plurality of first transverse carriages 112 are used to drive the fuel relay truck 163. A different point is that a plurality of fuels 54 are suspended at the same time and are simultaneously transferred to and loaded on the fuel rack 2.

According to such a first modification example, the following effects can be obtained.

If this example is adopted, the fuel handling work cycle (ab) above the core 101 and the reciprocation from the top of the core 101 to the fuel storage pool 102 (b-c-d, e-).
f), and the fuel handling work above the fuel storage pool 102 (f-g-h) can be separated into parallel work cycles.
The cycle (ab) for transferring the fuel 54 from the core 101 to the fuel relay truck 163 is about 10 as in the fifth embodiment.
It is about 0 seconds. Further, the fuel transfer cycle (b to c to d, e to f to g from the fuel relay truck 163 to the fuel rack 2).
~ H), if two first traverse carriages 112 are used,
It is half that of the first embodiment of the invention of about 200 seconds. The cycle criticality when this example is adopted is
The cycle (b to c to d, e to f to g to h) from the fuel relay truck 163 to the fuel rack 2 is about 200 seconds, and the fuel extraction period is about 340 seconds in terms of one fuel 54. It is shortened. This is about 4 times that of the conventional method.
This is equivalent to being able to shorten the fuel extraction period of / 11.

(Second Modification) In this modification, a plurality of first multi-stage telescopic masts 132 are mounted on the first traveling carriage 110 traveling above the fuel storage pool 102.
Of the core shroud 103 is installed on the upper surface of the core shroud 103, and a rotating carriage 161 is installed on the upper surface of the core shroud 103, on which a fuel lifting carriage 162 and a plurality of fuel relay carriages 163 are mounted.
And a second traveling vehicle equipped with a suspension device for transferring the fuel relay vehicle 163 from the rotating vehicle 161 to the fuel storage pool 102 are caused to travel on the track of the operation floor 103, and the fuel is submerged in water by the cooperative operation of these. It was designed to be handled.

The operation of this second modification is essentially the same as that of the above-mentioned fifth embodiment, but the fuel is transferred by using the second traveling carriage while the fuel relay carriage 163 is equipped with a plurality of fuels 54. The relay truck 163 is hung up and the fuel storage pool 102 is hung up.
The plurality of fuels 54 are simultaneously lifted from the fuel relay carriage 163 by the first multistage telescopic masts 132 of the plurality of first transverse carriages 112 that traverse the first traveling carriage 110. The difference is that the fuel rack 2 is simultaneously transferred and loaded.

According to such a second modification example, the following effects can be obtained.

When this example is adopted, the fuel handling work cycle (ab) above the core 101 and the reciprocation from above the core 101 to the fuel storage pool 102 (b-c-d, e-).
f), and parallel work of fuel handling work cycles (fgh) above the fuel storage pool 102.
The transfer cycle (ab) of the fuel 54 from the core 101 to the fuel relay truck 163 is about 100 seconds as in the fifth embodiment. Cycles (b to c to d) for transporting the fuel relay cart 163 from the rotary cart 161 to the fuel storage pool 102.
e to f) is about 1 when using a device having a conventional moving speed.
It takes about 70 seconds (B + C + E = 170 seconds). When four fuels 54 are mounted on the fuel relay truck 163 and transferred, 1
This carrying cycle in terms of body contact is about 45 seconds.

Further, in the fuel transfer cycle (f to g to h) from the fuel relay truck 163 to the fuel rack 2, when the two first traverse trucks 112 are used, the fuel transport cycle above the fuel storage pool 102 according to the conventional method is used. Handling period of fuel 54 (G + F = 230
This is about 1/2 second, which is about 115 seconds. When the present invention is adopted, the criticality of the cycle is about 115 seconds of the cycle above the fuel storage pool 102, and the fuel removal period is about 425 in terms of one fuel 54.
It is reduced by about a second. This corresponds to a fuel extraction period of about 2/9 of the conventional method.

(Third Modification) In this modification, a plurality of first multi-stage telescopic masts 132 are mounted on the first traveling carriage 110 traveling above the fuel storage pool 102.
The traverse bogie 112 of FIG. 1 is traversed, a rotary bogie 161 that rotates in the circumferential direction is installed on the upper surface of the core shroud 104, and a fuel lift truck 162 and a plurality of fuel relay trucks 163 are installed thereon.
Is mounted and an overhead crane is used to transfer the fuel relay truck 163 from the rotary truck 161 to the fuel storage pool 102, and the fuel is handled underwater by the cooperative operation of these.

The operation of this third modification is essentially the same as that of the second modification.
It is similar to the modification, but differs in the following points. The second traveling carriage is used to transfer the fuel relay carriage 163 from the upper part of the core 101 to the fuel storage pool 102 by using the overhead crane.

According to such a third modification example, the following effects can be obtained.

The effect expected by adopting the present invention is the same as that of the first embodiment of the fifth invention, and the criticality of the cycle when the present invention is adopted is that the cycle above the fuel storage pool 102. (F to g to h) is about 115 seconds, and the fuel take-out period is reduced by about 425 seconds when converted per fuel 54. This corresponds to a fuel extraction period of about 2/9 of the conventional method. Unlike the fifth embodiment described above, the second traveling carriage 11
Since 0 is not required, the equipment cost is low.

In this embodiment, the first traveling on the orbit of the operation floor 103 above the reactor pressure vessel 100
Of the second traveling carriage 111 that travels on the track of the operation floor 103 above the fuel storage pool 102 by traversing the first traveling carriage 112 having the first multi-stage telescopic mast 132 mounted thereon. A second traversing carriage 113 having a second multi-stage telescopic mast 133 attached thereto is traversed, and a plurality of fuels 54 are mounted on the third traveling carriage 181 traveling between the first and second traveling carriages. Third traverse vehicle 1 equipped with a device for suspending the fuel relay device 182
83 is traversed, and a plurality of fuel relay devices 182 are installed on the floor surface of the reactor pit 1 and the floor surface of the fuel storage pool 102, and the fuel is handled underwater by the cooperative operation of these.

As shown in FIG. 25, the first multi-stage telescopic mast 132 mounted on the first traveling carriage 112 that traverses the first traveling carriage 110 traveling on the operation floor 103, and the second traveling carriage The second multi-stage telescopic mast 133 mounted on the second traversing carriage 113 that traverses the carriage 111 and the third traveling carriage 181 that travels between the first and second traveling carriages, and the plurality of fuels 54 The fuel 54 is handled through the fuel relay device 182 equipped with the.
The fuel relay device 182 includes a fuel tray, a fuel holding mechanism, a rotating column, a rotating table, a mounting table, and the like. In addition, a hanging fitting is attached to the apex of the column.

In the sixth embodiment having such a configuration, the lid of the reactor pressure vessel 100 is removed, and the fuel relay device 182 is attached to the floor of the reactor pit 1 and the fuel storage pool 1.
The first traversing carriage 112, which is installed by being suspended by an overhead crane on the floor of No. 02, and is attached with the first multi-stage telescopic mast 132.
The first traveling carriage 110 equipped with the
0, and a third traveling carriage 181 equipped with a third traverse carriage 183 equipped with a device for suspending a fuel relay device 182 carrying a plurality of fuels 54 is mounted on the operation floor 103 above the canal 7. Run on orbit,
The second traveling carriage 111 equipped with the second traverse carriage 113 to which the second multistage telescopic mast 133 is mounted is caused to travel on the track of the operation floor 103 above the fuel storage pool 102, and the preparation for the fuel handling work is completed. To do.

Next, the procedure for transferring the fuel 54 from the core 101 to the fuel rack 2 of the fuel storage pool 102 will be controlled. First traveling carriage 110 and first traverse carriage 112
The first multi-stage telescopic mast 132 by running and traversing
Are moved directly above the fuel 54 to be taken out. When it is confirmed by a detector (not shown) or the like that it has come right above, the first multistage telescopic mast 132 is extended. Multi-stage telescopic mast 1
The grip attached to the tip of 32 is the hanging metal fitting 55 for the fuel 54.
When it is confirmed by a detector (not shown) or the like that the vehicle has come to a stop, the descent is stopped, the hanging metal fitting 55 of the fuel 54 is grasped, and the grasped state is confirmed by the detector (not shown)
32 is contracted, and the fuel 54 is lifted to a position slightly higher than the top of the fuel tray 169 of the fuel relay device 182. On the other hand, in the fuel tray 169 of the fuel relay device 182, the fuel 54
If there is a place where is not mounted, the fuel tray 169 of the place where is not mounted is directed toward the core 101, and at this time,
The fuel holding mechanism 170 is in an open state so that the fuel 54 can be loaded laterally. First traveling carriage 110
And the fuel 54 caught at the tip of the first multi-stage telescopic mast 132 while traveling and traversing the first traverse carriage 112.
Are moved right above the fuel tray 169 of the fuel relay device 182. When it is confirmed that the fuel 54 has come directly above the fuel tray 169 (a confirmation device (not shown)), the first multi-stage telescopic mast 132 is extended to move the fuel 54 to the fuel relay device 182.
The fuel tray 169 of

When it is confirmed that the fuel 54 has landed on the fuel tray 169, the first multi-stage telescopic mast 132 is stopped from being extended, and the fuel holding mechanism 170 is closed to hold it gently. When it is confirmed that the holding work is completed, the first multi-stage telescopic mast 132 is extended again, and when it is confirmed that the load on the grasping tool at the tip end thereof is removed, the connection state between the grasping tool and the fuel 54 is released. To do. When it is confirmed that this connection has been released, the first multistage telescopic mast 132
The first traveling carriage 110 and the first traverse carriage 1
12 is made to run and traverse, and is made to run to the position of the fuel 54 to be extracted next.

When the fuel 54 is loaded in all the fuel trays 169 of the fuel relay device 182 installed on the floor of the reactor pit 1, the third traveling carriage 181 and the third traverse carriage 1 are loaded.
83 is made to run and traverse, and the suspending metal of the suspending device of the transverse carriage 183 is moved to directly above the suspending metal of the fuel relay device 182. When it is confirmed that the hanging metal fitting of the hanging device of the traverse carriage 183 is located directly above the hanging metal fitting of the fuel relay device 182, the hanging metal fitting is extended and the fuel relay device 182 is extended.
Grasp the hanging metal fitting and lift the fuel relay device 182.

The third traveling carriage 181 and the third traverse carriage 183 are made to travel and traverse, and the fuel storage pool 102
And hang the fuel relay device 182 on the floor,
Install it there. The fuel relay device 18 installed on the floor of the fuel storage pool 102 and not equipped with the fuel 54
2 is lifted, the third traveling trolley 181 and the third traversing trolley 183 are run and traverse, moved to the reactor pit 1, and the fuel relay device 182 in which the fuel 54 is not mounted on the floor is suspended. Install and wait to receive fuel 54 withdrawn from core 101.

Second traversing carriage 1 of second traveling carriage 111
Extend the second multi-stage telescopic mast 133 mounted on 13,
When the fuel 54 mounted on the fuel relay device 182 is grasped by the grasping tool, the second traveling carriage 111 and the second traverse carriage 11
3 is made to travel and traverse, and the fuel 54 grasped by the second multistage telescopic mast 133 is moved to a position directly above the predetermined position of the fuel rack 2.

When it is confirmed by the sensor or the image information (not shown) that the second multi-stage telescopic mast 133 has come to a predetermined position of the fuel rack 2, the second multi-stage telescopic mast 133 is extended and the fuel rack 2 is extended. Then, the fuel 54 is loaded.
When the sensor (not shown) information confirms that the fuel rack 2 has landed, the gripped state of the fuel 54 at the tip of the second multistage telescopic mast 133 is released, and the second traveling carriage 111 and the second traveling carriage 111 and the second traveling carriage 111 The traverse carriage 113 is caused to travel and traverse, and is moved directly above the fuel tray 169 of the fuel relay device 182. After that, by repeating these operations, the fuel 5
4 will be taken out from the core 101. Also, the core 10
The fuel 54 is loaded in the No. 1 in the reverse order of the above.

According to the sixth embodiment, the following effects can be obtained. That is, regarding the time taken to take out one fuel, in the conventional method, about 220 seconds (A = b-c-d) above and below the reactor pressure vessel 100 (A =
It takes 100 seconds, B = 50 seconds, C = 70 seconds, and traverses (d
~ E) takes about 40 seconds (D = 40 seconds), and the round trip (e-f) from above the reactor pressure vessel 100 to the fuel storage pool 102 takes about 50 seconds (E = 50 seconds). It takes about 150 seconds (G = 150 seconds) to go up and down (g to h) for mounting on the fuel rack 2 above the pool 102, and about 80 seconds (F = 80 seconds) to traverse (f to g). It takes about 540 seconds as a whole.

On the other hand, when the sixth embodiment is adopted, the fuel handling work cycle (a) above the reactor pressure vessel 100 is increased.
-B-c-d-e), the reciprocating fuel handling work cycle from the reactor pressure vessel 100 to the fuel storage pool 102 (e-f), and the fuel handling work cycle above the fuel storage pool 102 (f- e to h) can be separated into parallel work. The transfer cycle (ab-c-d-e) of the fuel 54 from the core 101 to the fuel relay device 182 is approximately 260 seconds, which is similar to the handling time of the fuel 54 above the reactor pressure vessel 100 of the conventional method. It is a degree. The reciprocating fuel handling work cycle (e to f) from the upper part of the reactor pressure vessel 100 to the fuel storage pool 102 is performed by the conventional reactor pressure vessel 1
It is about 50 seconds, which is the same as the round trip time from above 00 to the fuel storage pool 102.

In addition, the fuel transfer cycle (f to g to h) from the fuel relay device 182 installed in the fuel storage pool 102 to the fuel rack 2 is the same as the conventional method.
02 It is about 230 seconds, which is the same as the elevating and traversing for mounting on the fuel rack 2 above. When the present embodiment is adopted, the cycle critical is about 260 seconds in the cycle from the core 101 to the fuel relay device 182 (a to b to c to d to e), which is calculated as per fuel 54. The fuel removal period is shortened by about 280 seconds. This corresponds to being able to shorten the fuel extraction period to half that of the conventional method.

(First Modification) In this modification, the first multistage telescopic mast 132 is mounted on the first traveling carriage 110 traveling on the orbit of the operation floor 103 above the reactor pressure vessel 100. Multiple first traverse trucks 11
2 and a plurality of second traverse carriages 113 having the second multi-stage telescopic mast 133 mounted thereon are mounted on the second traveling traverse 111 which travels on the orbit of the operation floor 103 above the fuel storage pool 102. A third transverse carriage 183 equipped with a device for suspending a fuel relay device 182 having a plurality of fuels 54 mounted on a third traveling carriage 181 which is made to traverse and travels between the first and second traveling carriages. A fuel relay device 182 is installed on the floor surface of the reactor pit 1 and the floor surface of the fuel storage pool 102 so that the fuel is handled underwater by the coordinated operation of these.

The operation of the first modification is essentially the same as that of the sixth embodiment, but a plurality of fuels 54 are transferred from the core 101 to the fuel relay device 182 by using a plurality of first traverse carriages 112. A different point is that the plurality of fuels 54 are simultaneously transferred, and the plurality of second traverse carriages 113 are used to simultaneously transfer and load the plurality of fuels 54 from the fuel relay device 182 to the fuel rack 2.

According to such a first modification example, the following effects can be obtained. That is, regarding the time taken to take out one fuel, in the conventional method, the reactor pressure vessel 100
About 220 seconds (A-b-c-d) to move up and down (A
= 100 seconds, B = 50 seconds, C = 70 seconds), traverse (d to e) takes about 40 seconds (D = 40 seconds), and a round trip from above the reactor pressure vessel 100 to the fuel storage pool 102 ( e to f) takes about 50 seconds (E = 50 seconds),
About 150 seconds (G = 150) for ascending / descending (g to h) for mounting on the fuel rack 2 above the fuel storage pool 102.
It takes about 80 seconds to traverse (f to g) (F = 80).
It takes about 540 seconds in total.

On the other hand, if the first modification is adopted, the fuel handling work cycle (a
-B-c-d-e), the reciprocating fuel handling work cycle from the reactor pressure vessel 100 to the fuel storage pool 102 (e-f), and the fuel handling work cycle above the fuel storage pool 102 (f- g to h) can be separated into parallel work. The transfer cycle (a-b-c-d-e) of the fuel 54 from the core 101 to the fuel relay device 182 is performed by a traverse vehicle equipped with the first multi-stage telescopic mast 132 that traverses the first traveling carriage 110. If two 112 are used, the first embodiment
It becomes / 2, which is about 130 seconds. Reactor pressure vessel 10
1 The reciprocating fuel handling work cycle (e to f) from the upper side to the fuel storage pool 102 is about 50 seconds, which is the same as the reciprocating time from the upper side of the reactor pressure vessel 100 to the fuel storage pool 102 in the conventional method. is there.

Further, in the fuel transfer cycle (f to g to h) from the fuel relay device 182 to the fuel rack 2, the traverse carriage 113 equipped with the multistage telescopic mast 133 traversing over the second traveling carriage 111 is used for the traverse carriage 113. When using a table, 1/2 of that of Example 6
Is about 115 seconds. The cycle criticality when this modification is adopted is about 130 seconds in the cycle (a to b to c to d to e) from the core 101 to the fuel relay device 182, which is converted per fuel 54. The fuel extraction period is shortened by about 410 seconds. This corresponds to shortening the fuel extraction period to 1/4 that of the conventional method.

(Second Modification) In this modification, the first multi-stage telescopic mast 132 is mounted on the first traveling carriage 110 traveling on the orbit of the operation floor 103 above the reactor pressure vessel 100. Multiple first traverse trucks 11
2 is traversed, and a plurality of second traverse carriages 113 having the second multi-stage telescopic mast 133 attached are mounted on the first traveling carriage 111 traveling on the orbit of the operation floor 103 above the fuel storage pool 102. A plurality of fuel relay devices 182 are installed in the reactor pit 1 and the fuel storage pool 102 so as to traverse, and the fuel is handled underwater by the cooperative operation of the overhead crane and these devices.

The operation of this second modification is essentially the same as that of the first embodiment.
The modification is similar to that of Example 1, except that an overhead crane is used instead of the third traveling vehicle 181 and the fuel relay device 182 is transferred from the floor of the reactor pit 1 to the fuel storage pool 102 and installed. There is.

According to such a second modification, as in the first modification, the cycle criticality is the cycle (a-b-c-d) from the core 101 to the fuel relay device 182.
~ E) of about 130 seconds, and the fuel extraction period is reduced by about 410 seconds in terms of one fuel 54.
This corresponds to shortening the fuel extraction period to about 1/4 of the conventional method. Note that, unlike the first modification, the third traveling carriage 181 is not required, so the facility cost is low, and the first and second traveling carriages are collected above the reactor pressure vessel 100 or the fuel storage pool 102. The range of operations can be expanded, for example, the system can be operated intensively.

(Third Modification) In this modification, the first multistage telescopic mast 132 is mounted on the first traveling carriage 110 traveling on the orbit of the operation floor 103 above the reactor pressure vessel 100. Multiple first traverse trucks 11
2 is traversed, and a plurality of second traverse carriages 113 having the second multi-stage telescopic mast 133 attached are mounted on the second traveling carriage 111 which travels on the track of the operation floor 103 from above the fuel storage pool 102. A plurality of fuel relay devices 182 are installed in the reactor pit 1 and the fuel storage pool 102, and a crane device is installed on the operation floor 103 so that fuel can be handled underwater in cooperation with these devices. It was done.

The operation of the third modified example is essentially the same as that of the first modified example, except that the crane device installed on the operation floor 103 is used instead of the third traveling carriage 181 to operate the fuel. The difference is that the relay device 182 is transferred from the floor of the reactor pit 1 to the fuel storage pool 102 and installed.

According to the third modification, as in the first modification, the cycle criticality is the cycle (a-b-c-d) from the core 101 to the fuel relay device 182.
~ E) of about 130 seconds, and the fuel extraction period is reduced by about 410 seconds in terms of one fuel 54.
This corresponds to shortening the fuel extraction period to about 1/4 of the conventional method. Unlike the first modification, by using a general-purpose crane device instead of the third traveling carriage 181 it is possible to reduce equipment costs.

[0371]

As described above in detail, according to the fuel handling apparatus and method of the present invention according to the present invention, it is possible to shorten the fuel handling period constituting the critical path of the regular inspection work of the light water cooling reactor. Therefore, the regular inspection period of the entire plant can be shortened and the operating rate of the nuclear power plant can be effectively improved.

[Brief description of drawings]

FIG. 1 is a view showing a first embodiment of the present invention and is a vertical cross-sectional view showing the concept of handling fuel.

FIG. 2 is a plan view of FIG.

FIG. 3 is a view taken in the direction of arrows AA in FIG. 2;

FIG. 4 is a view on arrow BB in FIG.

5 is an enlarged plan view showing the fuel handling traveling vehicle shown in FIG. 2. FIG.

FIG. 6 is a view on arrow C-C in FIG. 2.

FIG. 7 is a view on arrow DD of FIG.

FIG. 8 is a plan view in the case where a traveling carriage equipped with two traverse carriages to which a multistage telescopic mast is attached is located above a core in Example 1.

FIG. 9 is an explanatory diagram showing an example of fuel transfer time distribution during refueling work.

FIG. 10 is a vertical cross-sectional view showing a second embodiment of the present invention and showing a state when the fuel is transferred to a fuel handling traveling vehicle by the fuel elevating device.

FIG. 11 is a view showing the concept of a vertical cross section of the fuel relay device according to the second embodiment.

FIG. 12 is a vertical cross-sectional view showing a state when the fuel is transferred from the fuel relay device to the fuel handling traveling vehicle by the articulated arm device in the second embodiment.

FIG. 13 is a vertical cross-sectional view showing how the fuel is lifted by the articulated arm device according to the second embodiment.

FIG. 14 is a vertical cross-sectional view showing the manner of handling fuel with a multistage telescopic mast mounted on a traversing trolley in Example 2;

FIG. 15 is a vertical cross-sectional view showing how the electrorheological applied dashpot is attached to the fuel rack in the second embodiment.

FIG. 16 is a plan view showing Embodiment 3 of the present invention and showing a state of handling fuel with a multistage telescopic mast.

FIG. 17 is a plan view showing how the multistage telescopic mast handles fuel in the third embodiment.

FIG. 18 is a plan view showing how fuel is handled by the multistage telescopic mast in the third embodiment.

FIG. 19 is a vertical cross-sectional view showing how the multistage telescopic mast and the fuel relay device handle fuel in the third embodiment.

FIG. 20 is a plan view showing how fuel is handled by a multistage telescopic mast mounted on a traverse carriage and a plurality of articulated arm devices in a third embodiment.

FIG. 21 is a vertical cross-sectional view showing a fourth embodiment of the present invention, showing a state of handling fuel.

FIG. 22 is a vertical cross-sectional view showing how the multistage telescopic mast and the fuel relay device handle fuel in the fourth embodiment.

FIG. 23 is a vertical cross-sectional view showing how the multistage telescopic mast and the fuel handling traveling vehicle handle fuel in the fourth embodiment.

FIG. 24 is a vertical cross-sectional view showing a fifth embodiment of the present invention and showing a state when handling fuel.

FIG. 25 is a plan view showing Embodiment 6 of the present invention and showing how fuel is handled via a fuel relay device by a multistage telescopic mast and a third traveling carriage.

[Explanation of symbols]

 1 Reactor Pit 2 Fuel Rack 3 Frame 4 Upper Lattice Plate 5 Rail 6 Fuel Handling Traveling Vehicle 7 Canal 8 Retracting Track Mounting Platform 9 Trajectory Changing Mounting Platform 10 Trajectory Switching Device 11, 12 Trajectory 13 Switching Trajectory 14 Trajectory 15 Traveling Vehicle 16 Assembly Gear 17 orbit 20 set wheel 21 set wheel drive device 22 strut 23 fuel lifting device 24 fuel rotating mechanism 25 fuel cradle 26 fuel cradle moving device 27 control device 28 battery 31 fuel fixing device 32 fuel support mechanism 33 arm mechanism 34 pulley 35 drive Device 36 Set gear 37 Drive device 38 Fixed arm 39 Support base 41 Fuel gripping mechanism 42 Wire 43 Wire winding device 44 Winding device drive device 45 Set gear 51 Drive device 52 Set gear 53 Rotation mechanism 54 Fuel 57 Drive device 58 Set gear 59 Guide mechanism 60 Rail 61 Assembly car 62 Control device 63 Combiner 71 Multi-stage telescopic mast 72 Traverse vehicle 73 Traveling vehicle 74 Link type telescopic mechanism 81 Fuel relay device 82 Lifting device 83 Fixed frame 84 Rotating frame 85 Assembly gear 86 Drive device 87 Grip 88 Wire 89 Traveling take-up Equipment 90 Traveling rail 91 Struts 92 Trajectory 93 Assembly wheels 94 Multi-joint arm device 95 Traveling dolly 96 Multi-joint arm 97 Telescopic mast 98 Grasping tool 100 Reactor pressure vessel 101 Reactor core 102 Fuel storage pool 103 Operation floor 104 Core shroud 110 First Traveling carriage 111 Second traveling carriage 112 First transverse carriage 113 Second transverse carriage 114 First multi-stage telescopic mast 115 Second multi-stage telescopic mast 116 Electrorheological application dashpot 117 Fuel pan 118 Fixed platform 119 Bellows 120 Electric Viscous flow 121 Spring 122,123 Insulator 124 Electrode 125 Insulator 126 Flow path gap 127 Bellow 128 Lower chamber 129,130 Hole 131 Upper chamber 132 First multi-stage telescopic mast 133 Second multi-stage telescopic mast 141,142 Orbit 143 Third Traveling vehicle 144 Third traverse vehicle 145 Third multi-stage telescopic mast 169 Fuel tray 170 Fuel holding mechanism 181 Traveling vehicle 182 Fuel relay device 183 Third traverse vehicle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiro Yuguchi 8 Shinsita-cho, Isogo-ku, Yokohama-shi, Kanagawa Stock Company Toshiba Yokohama Works (72) Inventor Katsuhiko Sato 8 Shinsugita-cho, Isogo-ku, Yokohama, Kanagawa Company Toshiba Yokohama Office (72) Inventor Yoshiaki Shioda 8 Shinsita-cho, Isogo-ku, Yokohama-shi, Kanagawa Stock Company (72) Inventor Hitoshi Sato 1 Komushiba-cho, Kawasaki-shi, Kanagawa Prefecture 1-share In-house company Toshiba Research and Development Center (72) Inventor Kaoru Takagi 8 Shinsita-cho, Isogo-ku, Yokohama-shi, Kanagawa Stock company Incorporated at Toshiba Yokohama Works (72) Inventor Koji Fukumoto 8-shin-Sugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Company Toshiba Yokohama Works (72) Inventor Toshiro Saito 8 Shinsita-cho, Isogo-ku, Yokohama-shi, Kanagawa Stock Company Inside the Yokohama Works (72) Inventor Shin-ichi Kamiya 66-2 Horikawa-cho, Sachi-ku, Kawasaki-shi, Kanagawa Toshiba Engineering Co., Ltd. (72) Inventor Masaharu Kurabayashi 1st in Toshiba-fu, Fuchu-shi, Tokyo Inside the Fuchu factory, Toshiba ( 72) Inventor Toshikazu Tanba 1 Toshiba Town, Fuchu City, Tokyo Inside the Fuchu Factory, Toshiba Corporation (72) Inventor Tadashi Tsuji 8 Shinsita Town, Isogo Ward, Yokohama City, Kanagawa Prefecture

Claims (19)

[Claims] 1. A track is provided on the floor surface of the reactor pit and the upper surface of the frame of the fuel rack, and a fuel handling carriage can be run on the track, and the track is run on the operation floor above the reactor pressure vessel. A fuel handling device for a nuclear reactor characterized in that a traveling carriage equipped with a multistage telescopic mast for lifting and lowering fuel is mounted on the traveling carriage. 2. A plurality of first traversing carriages having multi-stage telescopic masts are mounted on a first traveling carriage that travels on an orbit of an operation floor above the reactor pressure vessel, and fuel is stored from the reactor pit floor surface. An orbit is connected to the gantry installed in the pool, and part of the orbit is parallel to the traveling carriage that runs on the orbit of the operation floor above the reactor pressure vessel, and the orbit of the operation floor above the fuel storage pool is placed. A fuel handling device for a nuclear reactor, comprising a plurality of second traversing carriages each having a multi-stage telescopic mast for raising and lowering mounted on a second traveling carriage. 3. A fuel handling system for a nuclear reactor according to claim 1, wherein a fuel relay device rotating in the circumferential direction is installed between the reactor pressure vessel and the core shroud, and the fuel relay device has a fuel storage pool side. A fuel handling device for a nuclear reactor characterized in that a fuel lifting device is provided on the floor surface of the reactor pit above the reactor. 4. A fuel handling device for a nuclear reactor, characterized in that an articulated arm device with a telescopic mast is provided in place of the fuel lifting device according to claim 3. 5. A first and second traveling bogies, which travel on the orbit of the operation floor above the fuel storage pool and on the orbit of the operation floor above the reactor pressure vessel, are provided with first and second multistage telescopic masts. A fuel handling device for a nuclear reactor, comprising two traversing carriages, each of which is provided with a fuel relay device that rotates circumferentially between the reactor pressure vessel and the core shroud. 6. The first traveling on orbit of the operation floor above the reactor pressure vessel from above the fuel storage pool.
The first traverse vehicle with a multi-stage telescopic mast attached to the traveling bogie of No. 1 and traveling in the direction perpendicular to the first traveling bogie across the reactor pressure vessel on the track laid on the floor of the reactor pit The second traverse vehicle equipped with a multi-stage telescopic mast is mounted on the second traveling bogie, and a fuel relay device that rotates in the circumferential direction is installed between the reactor pressure vessel and the shroud. apparatus. 7. A fuel handling device for a nuclear reactor, comprising a plurality of the second traveling carriages according to claim 6. 8. A fuel handling system for a nuclear reactor, wherein the second traveling vehicle according to claim 6 can travel in parallel with the first traveling vehicle. 9. The second traveling vehicle according to claim 6,
A fuel handling device for a nuclear reactor, wherein a plurality of articulated arm devices with telescopic masts are installed around the core. 10. A track is provided from the floor of the reactor pit to the upper surface of the frame of the fuel rack, and the fuel handling carriage can run on the track, and runs on the track of the operation floor above the reactor pressure vessel. A traveling carriage equipped with a multi-stage telescopic mast is installed on the traveling carriage, and a fuel relay device that rotates in the circumferential direction between the reactor pressure vessel and the core shroud is installed. A fuel handling device for a nuclear reactor, comprising a multi-joint arm device with a telescopic mast for handling a plurality of fuels. 11. The fuel handling system for a nuclear reactor according to claim 6, wherein the fuel handling system is installed between the reactor pressure vessel and the core shroud and rotates in the circumferential direction, and is installed on the upper surface of the core shroud. A fuel handling device for a nuclear reactor, which is equipped with a fuel relay device. 12. The fuel handling system for a nuclear reactor according to claim 6, wherein a link type telescopic arm is attached to a tip end mast of a multistage telescopic mast mounted on a traverse vehicle that traverses on a second traveling bogie, and a fuel relay device. A fuel handling device for a nuclear reactor, characterized in that the fuel can be loaded into the side surface and the fuel can be taken out from the upper surface. 13. The fuel handling system for a nuclear reactor according to claim 12, wherein a fuel elevating device is provided on the floor surface of the reactor pit above the fuel storage pool side of the fuel relay apparatus, and the floor surface of the reactor pit and the fuel storage system. A fuel handling device for a nuclear reactor, characterized in that a track is provided for the gantry installed in the pool, and a plurality of fuel handling trolleys are mounted on the gantry for fuel handling. 14. A first traverse vehicle equipped with a first multi-stage telescopic mast having a link type telescopic mechanism mounted on a first traveling vehicle traveling on a track on an operation floor above a reactor pressure vessel. A second traverse trolley equipped with a second multi-stage telescopic mast with a link-type telescopic mechanism is installed on the second trolley that is traversable and travels on the track of the operation floor above the fuel storage pool. A fuel handling device for a nuclear reactor, comprising a fuel relay device that is traversable and that is circumferentially rotatable on the upper surface of the core shroud and that extracts fuel from the lateral and upper surfaces. 15. A first traveling carriage that travels on an orbit of the operation floor extending from above the fuel storage pool to above the reactor pressure vessel is equipped with a first traverse carriage having a multi-stage telescopic mast, and a core shroud. A rotary trolley is provided on the upper surface of the fuel cell, and a fuel lifting trolley and a fuel relay trolley on which a plurality of fuels are mounted are installed on the rotary trolley, and it is possible to handle the fuel using these. Furnace fuel handling equipment. 16. The fuel handling apparatus for a nuclear reactor according to claim 15, wherein a second traveling carriage equipped with a device for suspending the fuel relay carriage is mounted on the track of the operation floor. Handling equipment. 17. A first traverse vehicle equipped with a multi-stage telescopic mast can be traversed on a first traveling carriage that travels on a track on an operation floor above the reactor pressure vessel, and above the fuel storage pool. The third traveling in which the second traveling carriage having the multi-stage telescopic mast mounted thereon can be traversed on the second traveling carriage traveling on the track of the operation floor, and traveling between the first and second traveling carriages. A third traverse trolley equipped with a device for suspending and transferring a fuel relay device carrying a plurality of fuels on a trolley is traversed, and a fuel relay device is further mounted on the reactor pit floor surface and the fuel storage pool floor surface. A fuel handling device for a nuclear reactor, characterized in that a plurality of units are installed, and these can be used to handle fuel. 18. A fuel handling traveling vehicle is made to travel on a track installed on the floor surface of the reactor pit and the upper surface of the frame of the fuel rack, and at the same time, the traveling vehicle is carried on the track on the operation floor above the reactor pressure vessel. A traveling trolley provided on a traversing trolley mounted on the trolley is run, and the fuel is lifted and hung by a multistage telescopic mast, and the fuel is moved by a coordinated operation between the trolleys. How to handle. 19. A plurality of fuel handling traveling vehicles, traveling vehicles or traversing vehicles according to claim 18 are used, and a plurality of fuels are simultaneously or sequentially moved by using a fuel relay device. Reactor fuel handling method.