JP3145523B2 - Reactor fuel transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reactor fuel transfer device for a nuclear power plant, in which a fuel transfer vehicle can be pulled out in an emergency.

[0002]

2. Description of the Related Art An outline of a typical fuel transfer device in a nuclear power plant will be described with reference to FIG. FIG. 8 shows the overall configuration of the fuel transfer device.

[0003] The reactor fuel transfer device (fuel transfer device)
This is a device for transferring the fuel used in the nuclear reactor and the fuel used in the nuclear reactor between the pit 60 in the containment vessel 101 and the spent fuel pit 61 in the auxiliary building 102.

The pit 60 and the spent fuel pit 61 are filled with water, and the pit 60 and the spent fuel pit 61 are connected by a transfer pipe 62. The transfer pipe 62 is opened only during the fuel transfer operation, and the gate valve 63 and a lid (not shown) are closed during normal operation. A gantry 64 and a gantry 65 are provided in the pit 60 and the spent fuel pit 61 with the transfer pipe 62 interposed therebetween.
A rail 66 is laid. A transfer vehicle 67 and a container 68 are movable along the rail 66. The gantry 64 and the gantry 65 are provided with a raising / lowering device 69, and the fuel stored in the container 68 in a vertical state is leveled by the raising / lowering device 69.

A drive unit 71 is provided on the operation floor 70 of the auxiliary building 102, and a loop chain 72 driven by the drive unit 71 is provided along the gantry 65. A chain lug 73 is attached to the transfer vehicle 67, and the loop chain 72 and the chain lug 73 are connected. When the driving device 71 drives the loop chain 72, the transfer vehicle 67 moves via the chain lug 73.

In the event that the transport vehicle 67 or the container 68 fails and cannot be moved by the loop chain 72, the emergency transport mechanism 74 pulls the transport vehicle 67 toward the spent fuel pit 61.

The emergency pull-out mechanism 7 will be described with reference to FIGS.
4 will be described. FIG. 9 shows the overall configuration of the emergency pull-out mechanism 74,
FIG. 10 shows a cross section of the wire rope supporting portion, and FIG.
FIG. 12 shows the relationship between the wire rope and the transport vehicle when viewed from the direction of the line XI-XI in FIG.

As shown in FIG. 9, a spent fuel pit 61
The terminal 76 of the wire rope 75 is held in the vicinity of the operation floor 70, and the other end of the wire rope 75 is connected via a terminal fitting 81 to the end (left end) of the gantry 65 near the transfer pipe 62 via pulleys 77 and 78. Supported by the fixing portion 79. The transfer vehicle 67 is provided with a guide hardware 80 and a wire rope 75.
Penetrates the guide hardware 80.

In the event of an abnormality, the emergency pull-out mechanism 74 pulls the terminal 76 of the wire rope 75 strongly to disengage the terminal fitting 81 from the fixing portion 79, and applies the terminal fitting 81 to the guide fitting 80 to transfer the vehicle. 67 is moved rightward.

As shown in FIG. 10, a fixing part 82 is provided on the fixing part 79 and is attached to the gantry 65, and a joint 83 is pin-connected to the fixing part 82. As shown in FIG. 11, a plurality of joints 83 are provided in the axial direction (four in the illustrated example).
Of the end fitting 81
Large diameter portion 85 is fitted. By strongly pulling the wire rope 75, the large-diameter portion 85 pushes and spreads the slit 84, and the terminal fitting 81 separates from the joint 83, and the terminal fitting 81 contacts the guide fitting 80 as shown by a two-dot chain line in FIG. Touch

As shown in FIG. 12, a guide metal member 80 is fixed to a transfer vehicle 67 via a support beam 86, and a terminal metal member 8 is provided.
1 is brought into contact with the guide hardware 80, whereby the transfer vehicle 67 is moved.
Is moved by being pulled by the wire rope 75.

[0012] As shown in FIG.
Are provided on both sides of the gantry 65, and the loop chains 72 on both sides are connected to a chain lug 73 provided at the rear end of the transfer vehicle 67.

When transporting the fuel, the loop chain 72 is driven by the driving device 71, and the transfer vehicle 67 is moved along the rail 66 via the chain lug 73.

If the transport vehicle 67 or the container 68 breaks down and cannot be moved by the loop chain 72, the terminal 76 of the wire rope 75 is strongly pulled. By pulling the wire rope 75, the large diameter portion 85 of the terminal fitting 81 is detached from the joint 83, and the terminal fitting 81 is brought into contact with the guide fitting 80. Thereby, the transfer vehicle 67 is pulled and moved by the wire rope 75, and the transfer vehicle 67 is pulled out to the spent fuel pit 61 side.

[0015]

The fuel transfer device operates underwater, and in the case of a device failure, it is necessary to repair it after draining water. In the unlikely event that a failure occurs with the fuel loaded, drain the fuel after removing the fuel. In the emergency pull-out mechanism 74 in the conventional fuel transfer device, the pull-out direction of the transfer vehicle 67 is only on the auxiliary building 102 side, and cannot be pulled out on the containment vessel 101 side. For this reason, there was a possibility that drainage and repair could not be performed efficiently. In addition, since the loop chain 72 and the transfer vehicle 67 are connected via the chain lug 73, it is difficult to pull out the wire rope 75 when the drive device 71 and the loop chain 72 fail.

[0016]

In order to solve the above-mentioned problems, a construction of the present invention comprises a transport rail laid at the bottom of a pit to be filled with water, a reciprocating motion on the transport rail, and a lifting and lowering of a fuel container. In a fuel transfer device having a fuel transfer vehicle pivotally supported, a terminal pulley provided adjacent to one end of the transfer rail, and a terminal pulley wound around the terminal pulley and provided along the transfer rail. A wire rope, a winding device provided on the operation floor above the pit and winding the base end of the wire rope, and a bracket provided close to the winding device for locking and holding a tip of the wire rope. A wire button holding bracket provided in close proximity to the terminal pulley and removably gripping the button of the wire rope, and the wire rope provided on a side of the fuel transfer vehicle is inserted therethrough. Characterized in that annexed very moving mechanism consisting of a wire button chuck device and capable of holding the button with.

[0017]

[Action] In the event of an emergency, pull in the tip of the wire rope and unwind the base end of the wire rope from the unwind drum device.
The button is disengaged from the wire button holding bracket, and the button is held by the wire button chuck device of the fuel transfer vehicle. Once the button is engaged, the wire button chuck device is maintained in engagement, so by pulling the end of the wire rope in the direction in which the fuel transfer vehicle is to be pulled out, the fuel transfer vehicle can be moved in both directions by the wire rope. .

[0018]

FIG. 1 is an overall configuration of an emergency pull-out mechanism in a reactor fuel transfer device according to an embodiment of the present invention, FIG. 2 is a sectional view of a main part, FIG. 4
5 illustrates the structure of the transfer vehicle, FIG. 5 illustrates a front view of FIG. 4, FIG. 6 illustrates a view taken along line VI-VI in FIG. 5, and FIG. 7 illustrates a detailed state of the lock device in FIG. . Note that the same members as those described in FIGS. 8 to 12 are denoted by the same reference numerals.

As shown in FIG. 1, the operation floor 70 of the spent fuel pit 61 as a pit is provided with a manual drum device 8 as a winding device and a bracket 2 for holding the wire rope 1. An end pulley (pulley) 7 is provided on the transfer pipe 62 side (left end side) of the gantry 65 (transport rail), and a double pulley device 4 is provided on the right end side of the gantry 65. The double pulley device 3 is provided on the wall surface.

The base end (one end) of the wire rope 1 is supported by the manual drum device 8, and the front end (the other end) of the wire rope 1 is supported by the bracket 2 so as to be retractable. As shown in FIG. 3, one end of the wire rope 1 passes through the guide rod 21 of the bracket 2, and the other end of the wire rope 1 has a loop-shaped wire end 18 supported by a holding rod 20. The holding bar 20 is placed above the bracket 2 in the figure. The wire rope 1 is wound around a pulley 7 via double pulley devices 3 and 4.

As shown in FIG. 2, a button (wire button) 11 is attached between the other end (wire end 18) of the wire rope 1 and the pulley 7, and a piece gripper is provided near the pulley 7 of the gantry 65. Is provided. The wire button 11 is engaged with the wire button holding bracket 6, and the engagement of the wire button 11 is released only when the wire rope 1 is strongly pulled toward the other end.

The transfer vehicle 67 (see FIG. 4) as a fuel transfer vehicle is provided with a wire button chuck device 5, and the wire rope 1 between the wire button 11 and the wire end 18 passes through the wire button chuck device 5. I have. After the wire button 11 is engaged with the wire button chuck device 5 by the movement of the wire rope 1 to the other end, the wire button 1
1 maintains the engagement.

That is, a chuck 12 is supported by the wire button chuck device 5 so as to be rotatable about a shaft 13, and the chuck 12 is urged clockwise by a spring 15. A claw 14 is formed on the chuck 12. When the claw 14 is pressed by the wire button 11, the chuck 12 rotates against the urging force of the spring 15, and when the wire button 11 enters a space 16 as a chamber, the chuck 12 Is restored by the biasing force of the spring 15. As a result, the wire button 11 cannot be moved in the left direction in the figure due to the claw 14 of the chuck 12,
The wire button chuck device 5 moves right and left according to the movement of the wire rope 1.

2, reference numeral 10 denotes a small pulley;
9 is a pulley of the double pulley device 4.

As shown in FIGS. 4 and 5, on both sides of the gantry 65, a loop chain 72 is provided as a movable portion of a driving device, and a chain mounting lug 36 as a lug is fixed to the loop chain 72. . Pin 3 on transfer vehicle 67
A mounting plate 31 that extends in the axial direction is supported via the “0”, and slide tables 32 and 33 are slidably provided at both ends of the mounting plate 31.

A pin 35 as a fixing pin is inserted between the mounting plate 31 and the chain mounting lug 36, and one end of the pin 35 is supported on the mounting plate 31 side by a spring pin 38. The other end of the pin 35 is fitted to a pull-out plate 41, and the pull-out plate 41 is fixed to the slide tables 32, 33. By sliding the slide bases 32 and 33 toward the center, respectively, the support of the pin 35 by the spring pin 38 is released and the pin 35 comes off the chain mounting lug 36 as shown by the broken line in FIG. The groove 4 is formed on the upper surface of the mounting plate 31.
When the slide 2 is formed and the slide bases 32 and 33 move toward the center, the leaf spring 37 engages with the groove 42 and the moving position is fixed. When the pin 35 comes off from the chain mounting lug 36, the mounting plate 31 of the transfer vehicle 67 and the loop chain 7 are removed.
2 is in a non-connected state, and the transfer vehicle 67 can be moved independently of the loop chain 72. In the figure, reference numeral 39 denotes a tray.

A lock device 34 as a holding device is provided between the mounting plate 31 and the slide tables 32 and 33.

As shown in FIG. 6, the slide table 33 (3
A rib 44 is fixed to 2), and a flexible sleeve 45 having a plurality of slits at equal intervals in the axial direction is attached to the rib 44. A pin 46 is provided in the sleeve 45 and protrudes through the rib.
7 urges in the protruding direction (right side in the figure). When the pin 46 is urged by the coil spring 47,
The large diameter portion of the pin 46 contacts the inner periphery of the sleeve 45 so that the sleeve 45 does not bend.

A bearing 43 is fixed to the mounting plate 31, and an outer periphery of a sleeve 45 is fitted to the bearing 43. Pin 46
The outer circumference of the sleeve 45 is fitted to the bearing 43 in a state where the large diameter portion of the slide table is in contact with the inner circumference of the sleeve 45, so that the positions of the slide tables 32 and 33 are fixed and held. In a state where the positions of the slide tables 32 and 33 are fixed and held, the above-mentioned pin 35 is inserted across the mounting plate 31 and the chain mounting lug 36, and the loop chain 72 and the transfer vehicle 67 are connected. It is in a state of being left.

As shown in FIG. 6, when the pin 46 is pushed in by the tool 48 against the urging force of the coil spring 47, the large-diameter portion of the pin 46 comes off the inner periphery of the sleeve 45, and the sleeve 45 moves in the inner diameter direction. It becomes bendable. Further, when the rib 44 is pushed to the left in the figure (to the right in the case of the slide table 32), the sleeve 45 is bent in the inner diameter direction and the slide table 33 is bent.
(32) slides inside the stroke l. Slide stand 3
3 (32) slides, as described above,
5 comes off the chain mounting lug 36, the leaf spring 37 engages with the groove 42, and the slide table 33 (32) is locked. Thus, the transfer vehicle 67 can move independently of the loop chain 72.

The operation of the above-described fuel transfer device will be described.

Normally, the positions of the slide tables 32 and 33 with respect to the mounting plate 31 are fixed by the lock device 34, and the pins 35 are inserted between the mounting plate 31 and the chain mounting lugs 36, so that the loop chains 72 are provided. And the mounting plate 31 are connected. The transfer vehicle 67 is moved by the drive of the loop chain 72 to convey fuel (not shown).

In the event that the transport vehicle 67 or the like breaks down, the wire button 11 is released from engagement with the wire button holder 6 by strongly pulling the wire end 18 of the wire rope 1, and the wire rope 1 is further pulled. The wire button 11 is brought into contact with the chuck 12 of the wire button chuck device 5 and fitted into the space 16. Thereby, the transport vehicle 67 can be moved in both directions by the wire rope 1.

As shown in FIGS. 5 and 7, the pin 48 of the lock device 34 is pushed by a tool 48 against the urging force of the coil spring 47, and the rib 44 is further pushed in, so that the pin 46 slides against the mounting plate 31. Tables 32 and 33 have stroke l
Move to the center. By the movement of the slide bases 32 and 33, the pins 35 are pulled through the pull-out plate 41 and
6, the leaf spring 37 is engaged with the groove 42, and the slide bases 32 and 33 are locked. As a result, the loop chain 72 and the mounting plate 31 are disconnected from each other, and the transport vehicle 67 can move independently of the loop chain 72.

Therefore, if the transport vehicle 67 or the loop chain 72 breaks down, the transport vehicle 6
7 can be pulled out in both directions, and fuel can be pulled out to a desired part (container or auxiliary building).

[0036]

According to the nuclear fuel transfer system of the present invention, the wire rope is formed into a loop shape, and the fuel transfer vehicle is moved by engaging the button with the wire button chuck device for maintaining the engagement of the button. In addition, the fuel transfer vehicle can be moved in both directions by the wire rope. As a result, fuel can be withdrawn to the containment or auxiliary building,
In the event of an abnormality, drainage and repair can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an emergency pull-out mechanism in a reactor fuel transfer device according to one embodiment of the present invention.

FIG. 2 is a sectional view of a main part in FIG. 1;

FIG. 3 is an explanatory view of a support state of a wire rope.

FIG. 4 is a structural explanatory view of a transfer vehicle.

FIG. 5 is a front view of FIG. 4;

FIG. 6 is a view taken along line VI-VI in FIG. 5;

FIG. 7 is a detailed explanatory view of the lock device in FIG. 5;

FIG. 8 is an overall configuration diagram of a fuel transfer device.

FIG. 9 is an overall configuration diagram of an emergency extraction mechanism.

FIG. 10 is a sectional view of a wire rope support.

FIG. 11 is a view taken along line XI-XI in FIG. 10;

FIG. 12 is an explanatory diagram showing a relationship between a wire rope and a transport vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wire rope 5 Wire button chuck device 6 Wire button holding fixture 7 Pulley 8 Manual drum device 11 Wire button 12 Chuck 18 Wire end 31 Mounting plate 32, 33 Slide table 34 Lock device 35 Pin 36 Chain mounting lug 65 Stand 67 Transfer car

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G21C 19/32

Claims (2)

(57) [Claims] 1. A nuclear reactor fuel transfer apparatus comprising: a transfer rail laid at the bottom of a pit filled with water; and a fuel transfer vehicle reciprocating on the transfer rail and pivotally supporting a fuel container up and down. A terminal pulley provided adjacent to one end of the transport rail, and a wire rope wound along the terminal pulley and provided along the transport rail,
A winding device provided on the operation floor above the pit to wind the base end of the wire rope, a bracket provided close to the winding device to lock and hold the tip of the wire rope, and the terminal pulley A wire button holding bracket provided in close proximity to the wire rope for detachably gripping the button of the wire rope, and a wire button provided on a side portion of the fuel transfer vehicle, through which the wire rope is inserted and which can hold the button. A fuel transfer device for a nuclear reactor, comprising an emergency transfer mechanism including a chuck device. 2. The wire button holding device according to claim 1, wherein the wire button holding device includes a holding device for releasing the button only when the tip of the wire rope is pulled. A reactor fuel transfer device comprising: a chamber for locking a button; and a chuck that allows the button to pass through the chamber only when the tip of a wire rope provided on the entrance side of the chamber is pulled.