JPH06324185A - Foundation bolt protection cap and its handling device - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] The cap attachment / detachment operation for protecting the foundation bolts can be performed easily and efficiently by remote control. [Structure] A protective cap 21 has a tapered guide surface 22 formed on an outer peripheral portion on an upper end side, a plurality of locking holes 23 is formed in a peripheral wall near the upper end, and a female screw 24 is engraved on an axial center portion of the upper end side. To do. The handling device is attached to a hanger and has a protective cap 21.
A holder 31 for holding and lifting a cap, which has a locking pin 30 that can be inserted into and removed from a locking hole of, and a taper shape that is integrally provided below the holder and is fitted at the lower end of the holder to the top portion of the foundation bolt for centering. Guide 33 for locating the coating having the skirt portion 32, a frame body 43 provided outside the holder, and a contactor 34 for abutting the top portion of the base bolt provided at the center thereof and a base foundation for the contactor. Locking means 35 that allows the locking pin to be withdrawn from the protective cap when the descent is stopped due to contact with the top portion of the bolt to allow the protective cap to be attached to the base bolt by its own weight drop.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention covers a foundation bolt that is planted at the bottom of a fuel pool of a nuclear reactor and fixed to a fuel rack by tightening nuts for the purpose of preventing damage when replacing the fuel rack after the start of operation. Protective cap to protect,
And a protection cap handling device for remotely mounting and removing the protection cap from a foundation bolt.

[0002]

As is well known in the art, a large number of fuel racks for storing spent fuel are arranged in the fuel pool of a nuclear reactor. This fuel rack is fixed to the foundation bolts planted at the bottom of the fuel pool by tightening nuts.

FIG. 19 exemplifies a structure for fixing a fuel rack by such a foundation bolt. As shown in the figure, a base bolt 2 is planted in an inner bottom portion 1a of a fuel pool 1, and a rack base 4 of a fuel rack 3 is fastened and fixed by a nut 5 screwed to the base bolt 2. . When replacing the fuel rack 3, it is necessary to cover the base bolt 2 with a protective cap after removing the nut 5 in order to prevent damage to the base bolt 2 due to the movement of the rack 3.

By the way, when the fuel rack 3 is to be replaced after the start of operation, it is necessary to remove the nut 5 and attach / detach the protective cap by remote control from the standpoint of preventing radiation exposure.

Therefore, as shown by the arrow A in FIG. 19, the nut operating tool and the protective cap handling device are operated by lowering them from above the fuel rack 3 to the positions of the respective base bolts 2 with a hanging tool or the like. It is common.

Conventionally, as the protective cap, a cylindrical one having a lower surface opening having a lateral hole or the like has been applied, and as a cap handling tool, for example, as shown in FIG. 20, a jig 8 having a hook 6 on a shaft 6 is used. Has been applied. The jig 8 is suspended from above the pool by a wire or the like, hooked in a lateral hole of the protective cap, and the protective cap is attached to or detached from the foundation bolt 2.

[0007]

However, in the above-mentioned conventional technique, the operation of attaching and detaching the protective cap must rely on visual recognition. For example, when the jig 8 shown in FIG. Since 6 impairs the visual field from above, it is difficult to confirm the attachment / detachment position, and the operation is troublesome and complicated, resulting in low efficiency and other various problems.

The present invention has been made in view of the above circumstances, and it is not necessary to rely on visual recognition from above the fuel pool, and the cap attachment / detachment operation for protecting the foundation bolts can be performed easily and efficiently by remote control. An object of the present invention is to provide a protective cap for a foundation bolt that can be used and a device for handling the same.

[0009]

In order to achieve the above object, a protective cap for a foundation bolt according to the invention of claim 1 is planted at the bottom of a fuel pool of a nuclear reactor and nuts are tightened on a fuel rack. The base bolt to be fixed is a vertically long cylindrical protection cap that has an opening at the lower end for covering and protecting after removing the nut when the fuel rack is replaced, and a tapered guide surface whose upper end side has a gradually smaller upper end side outer peripheral portion. Is formed, and a plurality of locking holes extending in the lateral direction are formed in the peripheral wall near the upper end thereof, and a female screw is engraved on the axial center portion of the upper end side.

According to a second aspect of the present invention, there is provided a handling device for a protective cap, which is mounted on a hanger and which is attached to a foundation bolt by hanging the protective cap according to the first aspect. And a holder for lifting and lowering the cap, which is attached to the suspender and has a locking pin that can be inserted into and removed from the locking hole of the protective cap, and which is integrally provided below the holder in a vertically long tubular shape. A cover positioning guide having a tapered skirt that is fitted to the top of the foundation bolt at the lower end for centering, and a frame body provided on the outside of the holder so as to be able to move up and down, and a central portion thereof Provided for the abutment of the top portion of the base bolt and the protection of the locking pin based on the relative lowering operation of the holder when the contact is stopped by the contact with the top portion of the base bolt. Is withdrawn from the cap, characterized by comprising a lock means for enabling adherends to the foundation bolts by the weight drop in the protective cap.

A protective cap handling device according to a third aspect of the present invention is a handling device for a protective cap set in which the protective cap according to the first aspect is mounted on the handling device according to the second aspect above the floor above the fuel pool. A container with an open upper surface, a protection cap upright bar which is erected on the bottom of the container and in which the protection cap is detachably fitted, and a bottom wall of the container located around the protection cap upright bar. And a support base detachably provided on the lower end of the skirt portion of the guide according to the present invention.

A handling device for a protective cap according to a fourth aspect of the present invention, wherein the protective cap is attached to a hanger and is attached to a foundation bolt, and the protective cap is lifted from the foundation bolt and removed. A device for covering a cap, which has an inner diameter capable of being fitted into the protective cap and is attached to the hanger, and a vertical axis short cylinder, which is integrally provided below the holder and is provided at a lower end thereof. A positioning guide having a tapered skirt that is fitted on the top of the protective cap and is aligned with the center of the protective cap, and an inner end that can be slidably contacted with a tapered guide surface radially provided on the ring and on the upper end of the protective cap. It is characterized in that it is provided with a locking pin movable inward and outward and insertable into and removable from a locking hole of the protective cap, and a spring for constantly biasing the locking pin toward the inner end side.

According to a fifth aspect of the present invention, there is provided a protection cap handling device, wherein the protection cap is attached to a foundation bolt, and when the protection cap is engaged with and fixed to the foundation bolt, the protection cap is removed upward. A handling device for removing a cap in an abnormal condition, which is a pipe that can move up and down and has a length extending from an upper portion of a fuel pool to an inner bottom portion, a handle for rotating a pipe provided at an upper end of the pipe, and a lower end of the pipe. The present invention is characterized in that it is provided with a male screw that is screwed into the female screw of the protective cap and is detachably mounted on a joint-welded plate material via a magnet roller for traveling drive, A trolley that travels along the welding line direction of the plate material, a scanning mechanism that is attached to the trolley, and is movable in a direction along the welding line and a direction orthogonal to the welding line, and the scanning mechanism. An automatic ultrasonic flaw detector having an ultrasonic probe for ultrasonic flaw detection of a joint welded portion of the plate material, wherein the carriage detects the plate edge along the welding line direction and runs at the plate edge position. While providing a stopping means to stop,
In the scanning mechanism, a scanning range for detecting a welded portion at the plate end at the stop position of the carriage is set.

[0014]

According to the protective cap for a foundation bolt of the first aspect of the present invention, a taper-shaped guide surface is formed on the outer peripheral portion on the upper end side so that the upper end side has a gradually smaller diameter. It is easy to apply. Further, by forming a plurality of locking holes along the lateral direction on the peripheral wall near the upper end, a locking pin or the like can be easily inserted into and removed from the locking hole. Further, by engraving the female screw on the shaft center portion of the upper end side, when the cap is engaged with the base bolt, the male screw of the handling device can be screwed into the female screw and easily removed.

According to the protection cap handling device of the second aspect of the present invention, the operation of attaching the protection cap to the foundation bolt can be performed easily and efficiently by remote control without having to rely on visual recognition from above the fuel pool. . That is,
With the nut removed from the foundation bolt, hold the protective cap in advance with the locking pin of the holder and hang it through the inside of the fuel rack. However, it is fitted on the top of the foundation bolt to automatically perform centering. If the holder is further lowered after the protective cap is fitted on the foundation bolt, the contact is brought into contact with the top portion of the foundation bolt to stop the lowering. At this time, the locking means causes the locking pin to withdraw from the protective cap. However, the protective cap is lowered by its own weight and attached to the foundation bolt.

According to the protection cap handling device of the third aspect of the present invention, the operation of gripping the protection cap by the handling device of the second aspect can be easily performed above the fuel pool. That is,
Place the container on the floor above the fuel pool, and set the protective cap so that the protective cap can be removed and inserted. In this state, if the guide of the handling device according to claim 2 is suspended, the lower end of the skirt is detachably supported by the support base, so that the protective cap can be easily grasped by the locking pin and then withdrawn, and the basic bolt is removed. Can be easily moved to.

According to the protection cap handling apparatus of the fourth aspect of the present invention, the protection cap can be easily removed after the protection cap is attached to the foundation bolt and the fuel rack is replaced by the above-mentioned operation. That is, when the cap-covering ring is hung on the foundation bolt with a suspender, the ring is easily fitted onto the foundation bolt by the positioning guide having the tapered skirt portion. As a result, when the positioned ring is further lowered, the locking pin moves along the tapered guide surface at the upper end of the protective cap, and the locking pin is engaged by the biasing force of the spring at a position matching the locking hole. It is automatically inserted into the blind hole. Therefore, the protection cap can be easily removed from the foundation bolt by pulling up the ring with a lifting tool.

According to the protection cap handling device of the fifth aspect of the present invention, when the protection cap of the first aspect, which is attached to the foundation bolt, is fixed to the foundation bolt by biting,
Lower the pipe to the protective cap position, rotate the pipe by operating the handle provided at the top of the pipe,
Screw the male screw into the female screw of the protective cap. After this,
By pulling up the pipe with a certain force or more, even if the protective cap is bite and fixed to the foundation bolt, it can be removed relatively easily.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The present embodiment is applied to the case where the fuel rack 3 shown in FIG. 19 is removed and a fuel rack having a new configuration different from this is installed. Therefore, in the present embodiment, the mounting of the protective cap will be described with reference to FIG. 19 as well, and the same parts as those in FIG.

FIG. 1 schematically shows the structure and foundation bolt of a new fuel rack to be replaced, and FIG. 2 shows an enlarged structure of fixing the fuel rack to the foundation bolt.

As shown in FIGS. 1 and 2, in the new fuel rack 11 which is replaced in this embodiment, the rack base 12 fixed to the foundation bolt 2 is shown in FIG.
The fuel rack 11 is thicker than that of No. 9, and the fuel rack 11 is further fixed to the new rack base 12 by rack mounting bolts 13 and nuts 14.

3 to 6 show the construction of the protective cap according to this embodiment.

The protective cap 21 of the foundation bolt according to this embodiment has a tapered guide surface 22 having a gradually decreasing diameter on the upper end side and a plurality of laterally extending circumferential walls near the upper end. The locking hole 23 is formed, and a female screw 24 is engraved on the shaft center portion of the upper end side. The protective cap 21 is colored in a vermilion color as a whole.

According to the protective cap 21 having such a structure, the tapered guide surface 22 is formed on the outer peripheral portion on the upper end side so that the diameter of the upper end gradually becomes smaller. As a reference, it is easy to apply.
Further, a plurality of locking holes 23 along the lateral direction are formed in the peripheral wall near the upper end.
Since the opening is opened, a locking pin or the like described later can be easily inserted into and removed from the locking hole 23. Furthermore, since the female screw 24 is engraved on the axial center portion of the upper end, as will be described later,
When the protection cap is caught in the foundation bolt 2,
The male screw of the handling device can be screwed into the female screw 24 to be easily removed. In addition, since the protective cap 21 as a whole is colored in red, it is easily visible even in the water in the fuel pool 1.

7 and 8 show a handling device for attaching the protective cap, and FIGS. 9 and 10 show the operation thereof.

Protective cap handling device 3 according to the present embodiment
Reference numeral 0a is a handling device for attaching a protective cap, which is attached to a suspending tool 39 such as a wire and which hangs the protective cap 21 on the foundation bolt 2 to be attached thereto.

The handling device 30a of the present embodiment is roughly classified into a hanging device and a locking hole 23 of the protective cap 21.
A holder 31 for lifting and lowering a cap having a locking pin 30 that can be inserted into and removed from the holder 31 is integrally provided in the lower part of the holder 31 in a vertically elongated tubular shape, and the lower end of the holder 31 is fitted on the top portion of the foundation bolt 2 for centering. A coating positioning guide 33 having a tapered skirt portion 32, a frame body provided on the outside of the holder 31 so as to be capable of relative vertical movement, and a top bolt for abutment against the foundation bolt integrally provided at the center of the frame body. When the contactor 34 formed of a vertical rod or the like and the contactor abuts on the top portion of the foundation bolt 2 and stops descending, the engaging pin 30 is engaged with the engaging hole 23 of the protective cap 21 based on the relative descending operation of the holder 31.
Locking means 35 that allows the protective cap 21 to be attached to the foundation bolt 2 by its own weight drop.

More specifically, the holder 31 is provided with a plurality of, for example, four holding holes 36 in the circumferential direction at regular angular intervals along the radial direction. The locking pin 30 is provided in the holding hole 36.
Are inserted and are biased in the outer peripheral direction by springs 37, respectively. In addition, the eyebolt 3 is attached to the holder 31.
8 is provided, and a suspender 39 such as a wire is connected to this. A peripheral guide member 41, which is a rectangular plate and serves as a guide when inserting into the square pipe portion of the rack 3, is attached to the guide 33 in the form of a collar with a fastening tool 42 such as a bolt via a bracket.

The locking means 35 has a guide groove 44 extending in the vertical direction on the inner surface of the frame body 43 and an engaging hole 45 extending in the radial direction. The engaging hole 45 has a pin holding bolt 46. Is screwed from the outer peripheral side with a variable depth.
In the gripping state of the insertion protection cap, the locking pin 30
The outer end of the protective cap 21 is engaged with the guide groove 44, and the inner end is inserted into the locking hole 23 of the protective cap 21 to grip the protective cap 21 (see the right half of FIG. 7). In this state, the outer end of the locking pin 30 is dropped into the engagement hole 45, and the inner end of the locking pin 30 comes out of the locking hole 23 (see the left half of FIG. 7: FIG. 7 shows a holder). The upper and lower positions of 31 are vertically displaced. The frame body 43 of the holder 31 has an upper plate 47 and a lower plate 4 on the upper and lower portions.
8 is connected by a fastener 49 such as a bolt, and the contactor 34 is connected to the center position of the upper plate 47.

The handling device 3 of the present embodiment configured as described above
According to 0a, as shown in FIGS. 10 and 11, the operator can operate the suspending tool 39 to attach the protective cap on the work carriage 50 above the rack. That is, with the nut removed from the foundation bolt 2, the holder 31
When the protective cap 21 is held by the locking pin 30 and is hung down through the inside of the fuel rack 3, the tapered skirt portion 32 of the holder 33 for covering positioning is provided on the top of the foundation bolt 2. When fitted, the centering is automatically performed. Then, when the holder 31 is further lowered after the protection cap 21 is fitted on the foundation bolt 2, the lower end of the contactor 34 abuts on the top portion of the foundation bolt 2 and the lowering is stopped.
At this time, the locking pin 35 is retracted from the locking hole 23 of the protective cap 21 by the locking means 35,
Is lowered by its own weight and is attached to the foundation bolt 2. Therefore, according to the present embodiment, it is not necessary to rely on visual recognition from above the fuel pool 1, and the foundation bolt 2
The protective cap 21 can be attached to the front panel easily and efficiently by remote control.

11 and 12 show a handling device for the protective cap set.

Protective cap handling device 6 according to the present embodiment
1 is a handling device 61 for a protection cap set, in which the protection cap 21 shown in FIG. 3 is mounted on the handling device 30a shown in FIG. 7 on the floor above the fuel pool 1.

In this embodiment, the container 62 having an open upper surface.
And a protection cap upright bar 63 which is erected on the bottom of the container and into which the protection cap 21 is detachably fitted, and a protection cap upright bar 63 which is located around the protection cap upright bar 63 and is detachably mounted on the bottom wall 62a of the container 62 The guide 33 is provided with a support base 64 that detachably supports the lower end of the skirt portion 32 of the guide 33. The protective cap upright rod 63 is mounted by fitting a protrusion 66 into a hole 65 formed in the bottom wall 62a of the container 62. In addition, 67 is a handle and 68 is a support base 6.
4 is a substrate on which 4 is placed.

The handling device 6 of the present embodiment configured as described above
1, the handling device 30 for mounting above the fuel pool 1
The operation of gripping the protective cap 21 on the a can be performed easily. That is, the container 62 is installed on the floor above the fuel pool 1,
The protection cap 21 is detachably fitted and set on the protection cap upright bar 63. Handling device 2 in this state
When the guide 33 of No. 1 is suspended, the lower end of the skirt 32 is detachably supported by the support base 64, so that the protective cap 21 can be easily grasped by the locking pin 30, and then pulled out to the foundation bolt 2 described above. Can be easily moved.

13 and 14 show a handling device for removing the protective cap.

Protective cap handling device 7 according to the present embodiment
Reference numeral 1 denotes a handling device for removing the protective cap, which is attached to the lifting tool 39 and lifts and removes the protective cap 21 attached to the base bolt 2 from the base bolt 2.

The handling device of this embodiment has a protective cap 21.
A ring 72 for covering the cap, which has an inner diameter that can be fitted to the hanger 39 and is attached to the hanger 39, is provided integrally below the holder 33 in the shape of a short cylinder of the vertical axis, and is attached to the top of the protective cap 21 at the lower end thereof. A positioning guide 74 having a tapered skirt portion 73 that is fitted and aligned, and a tapered guide surface on the upper end of the protective cap 21, which is radially provided on the ring 72, can be slidably contacted with the inner end and can be moved inward and outward. Also, a locking pin 75 that can be inserted into and removed from the locking hole 23 of the protective cap 21, and a spring 76 that constantly biases the locking pin 75 toward the inner end side,
And 77. A hanging fitting 79 is connected to the ring 72 via a bracket 78, and the hanging tool 3 is connected to the hanging fitting 79.
9 can be connected.

According to the handling apparatus of this embodiment, the protection cap 21 can be easily removed after the protection cap 21 is attached to the foundation bolt 2 and replaced with the new fuel rack 11 shown in FIG. That is, when the cap-covering ring 72 is hung on the foundation bolt 2 by the lifting tool 39, the positioning guide 74 having the tapered skirt portion 73 is provided.
The ring 72 is thereby easily fitted onto the foundation bolt.
As a result, when the positioned ring 72 is further lowered, the tapered guide surface 22 at the upper end of the protective cap 21 is provided.
The locking pin 75 moves along with the locking pin 75, and the locking pin 75 is automatically inserted into the locking hole 23 by the urging force of the springs 76 and 77 at a position corresponding to the locking hole 23. Therefore, if the ring 72 is pulled up by the hanger 39, the protective cap 2
1 can be easily removed from the foundation bolt 2.

FIGS. 15 and 16 show a handling device for removal in the event of an abnormality, and FIGS. 17 and 18 show its operation.

Protective cap handling device 9 according to the present embodiment
Reference numeral 1 denotes a handling device for removing the protective cap 21 when the protective cap 21 adhered to the basic bolt 2 is bite and fixed to the basic bolt 2 and removes the protective cap 21 in an abnormal state.

The handling device 91 of this embodiment is used in the fuel pool 1.
And a pipe 92 having a length extending from above to the inner bottom portion, and a pipe 92 provided at the upper end of the pipe 92.
It is provided with a handle 93 for rotation and a male screw 94 which is provided at the lower end of the pipe 92 and is screwed into the female screw 24 of the protective cap 21. The pipe 92 is composed of upper and lower pipe elements 92a and 92b, and 95 is a connecting portion thereof. Further, 94a is a protective pipe for covering the pipe 92, 96 is a lever used for elevating and lowering the pipe, 97 is a pipe guide, 98 is a wrench adapter at the lower end of the pipe, and 99 is an adapter connecting plate.

The handling device 9 of this embodiment having the above-mentioned configuration
According to 1, the protective cap 21 attached to the foundation bolt 2
17 when it is fixed by being bitten into the foundation bolt 2.
As shown in FIG.
While being supported by, the lifting device 102 lowers it to the position of the protective cap 21. Then, as shown in FIG. 18, an operator on the melt 103 rotates the pipe with a handle 93 provided at the upper end of the pipe 92. As a result, the male screw 94 of the pipe 92 is screwed into the female screw 24 of the protective cap 21, and then the pipe 92 is applied with a force greater than a certain level.
By pulling up, it is possible to remove the protective cap 21 that is fixed by biting on the foundation bolt 2 relatively easily.

[0043]

As described above, according to the protective cap of the foundation bolt and the apparatus for handling the same according to the present invention, the cap attaching / detaching operation for protecting the foundation bolt can be performed without depending on the visual recognition from above the fuel pool. It has an excellent effect that it can be performed easily and efficiently by remote control.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a configuration diagram of a new fuel rack to be replaced.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a partial cross-sectional view showing the structure of a protective cap in the above embodiment.

FIG. 4 is a plan view of FIG.

FIG. 5 is a partial cross-sectional view showing the configuration of a protective cap whose angle is different from that of FIG.

6 is a sectional view taken along line BB of FIG.

FIG. 7 is a sectional view showing a handling device for attaching the protective cap in the embodiment.

FIG. 8 is a plan view of FIG.

9 is an explanatory view of the operation of the device shown in FIGS. 7 and 8. FIG.

FIG. 10 is an explanatory view of the operation of the device shown in FIGS. 7 and 8.

FIG. 11 is a sectional view showing a handling device for the protective cap set in the embodiment.

12 is a plan view of FIG.

FIG. 13 is a sectional view showing a handling device for removing the protective cap in the embodiment.

FIG. 14 is a plan view of FIG.

FIG. 15 is a cross-sectional view showing a handling device for abnormal removal according to the embodiment.

16 is an enlarged view of a main part of FIG.

FIG. 17 is an explanatory view of the operation of the device shown in FIGS. 15 and 16.

FIG. 18 is an explanatory view of the operation of the device shown in FIGS. 15 and 16.

FIG. 19 is a view showing a rack fixed state with foundation bolts.

FIG. 20 is a view showing a conventional device.

[Explanation of symbols]

 1 Fuel Pool 1a Inner Bottom 2 Foundation Bolt 3,11 Fuel Rack 5 Nut 21 Protective Cap 22 Guide Surface 23 Locking Hole 24 Female Thread 30 Locking Pin 31 Holder 32 Skirt 33 Guide 34 Contact 35 Lock Means 43 Frame 62 Container 63 Protective cap Standing bar 64 Support base 74 Ring 75 Locking pin 76, 77 Spring 92 Pipe 93 Handle 94 Male screw

Claims (5)

[Claims] 1. A vertically elongated tubular body having a base bolt, which is planted at the bottom of a fuel pool of a nuclear reactor and fixed to a fuel rack by tightening nuts, has a lower end for covering and protecting the nut after removing the nut when replacing the fuel rack. A protective cap,
A tapered guide surface with a gradually decreasing diameter on the upper end side is formed on the outer peripheral portion on the upper end side, a plurality of locking holes along the lateral direction are formed in the peripheral wall near the upper end, and a female screw is formed on the axial center portion of the upper end side. Protective cap for foundation bolts, which is characterized by being engraved. 2. A handling device for mounting a protection cap, which is mounted on a hanger and adapted to hang and attach the protection cap according to claim 1 to a foundation bolt. A holder for holding and elevating the cap, which has a locking pin that can be inserted into and removed from the locking hole of the cap, is vertically long and is integrally provided below the holder, and the lower end of the holder is fitted on the top of the foundation bolt. A coating positioning guide having a tapered skirt portion for centering, a frame body provided on the outside of the holder so as to be able to move up and down, and a top bolt for abutment against the foundation bolt integrally provided at the center of the frame body Of the contact and its lowering due to the contact of the contact with the top portion of the base bolt, the locking pin is withdrawn from the protective cap based on the relative lowering operation of the holder, and the weight of the protective cap is lowered. An apparatus for handling a protective cap, comprising: a locking means that enables the lower part to be attached to the foundation bolt. 3. A handling device for a protective cap set, wherein the protective cap according to claim 1 is mounted on the handling device according to claim 2 on a floor above a fuel pool, the container having an open upper surface, and 3. The guide according to claim 2, wherein a protection cap upright bar is provided upright on the bottom part and in which the protection cap is detachably fitted, and a protection cap upright bar that is located around the protection cap upright bar and is detachably provided on the bottom wall of the container. An apparatus for handling a protective cap, comprising: a support base that detachably supports the lower end of the skirt portion of the. 4. A handling device for removing a protective cap, which is mounted on a hanging tool and is attached to a foundation bolt and is lifted from the foundation bolt to remove the protective cap according to claim 1.
A ring for cap coating, which has an inner diameter that can be fitted in the protective cap and is attached to the hanger, and a vertical axis short tube, which is integrally provided below the holder and has a top portion of the protective cap at the lower end thereof. A positioning guide having a tapered skirt that is fitted to the center of the ring and a radial guide provided on the ring and the tapered guide surface at the upper end of the protective cap can be slidably contacted with the inner end and can be moved inward and outward. An apparatus for handling a protective cap, comprising: a retaining pin that can be inserted into and removed from the retaining hole of the protective cap; and a spring that constantly urges the retaining pin toward the inner end side. 5. A handling device for removing a protective cap in an abnormal state, which removes the protective cap upward when the protective cap of claim 1 attached to the basic bolt is fixed to the basic bolt by biting. , A pipe having a length extending from the upper side of the fuel pool to the inner bottom portion, which is capable of moving up and down, a handle for pipe rotation provided at an upper end of the pipe, and a female screw of the protective cap provided at a lower end of the pipe. An apparatus for handling a protective cap, which is provided with a male screw.