JPH02114200A - Fuel channel handling tool - Google Patents

Abstract

PURPOSE:To enable easy and exact positioning by providing the handling tool with a grasp part provided with the mast edge of a heat exchanger, a grasp mechanism for grasping the upper end of fuel channels and a guide rod for simulating the weight of a fuel assembly. CONSTITUTION:A fuel channel handle tool 7A is moved on a simple substance of a fuel channel 1 stored in a fuel storage rack by a grapple 27 provided at the lower end part of a mast of a heat exchanger 3. A guide rod 40 of the handle tool 7A is inserted in an opening part 38 of the channel 1 and a hook 35 is inserted in the opening part 38. At this time the hook 35 is closed to pass the opening part 38 in a condition to draw an actuating shaft 30 in the side of an air cylinder 31. After a pawl 37 of the hook 35 is passed in the opening part 38, air is supplied from an air hose 32 to an air cylinder 31 to push out the actuating shaft 30 so as to lock the pawl 37 with a clip 1a by the rotation of the hook 35.

Description

[Detailed Description of the Invention] (Object of the Invention) (Industrial Application Field) The present invention relates to a fuel channel handling tool that handles a fuel channel that has been removed from a fuel assembly in a fuel pool of a nuclear power plant. , especially regarding a fuel channel handling tool that allows the fuel channel to be handled by a fuel exchanger (prior art) The fuel channel 1 shown in FIG. It is handled in the nuclear reactor and spent fuel storage pool in a detached state. When transporting this fuel/assembly or installing it in a designated position in the reactor or in a fuel storage rack installed in a spent fuel storage pool, a This is done using a fuel exchanger.

The fuel exchange machine has a trolley that can be moved in two horizontal directions,
This trolley is equipped with a rigid mast that can be freely expanded and contracted in the vertical direction and allows the user to grasp the handle at the upper end of the fuel assembly. The fuel assembly held by this mast is automatically controlled and transferred to any XYZ position stored in a computer installed in the fuel exchanger.

By the way, if the fuel assembly is used for a predetermined period and reprocessed II.
When the spent fuel storage pool is transported out of the spent fuel storage pool, the fuel channel 1 is removed from the fuel assembly using a channel 11 (not shown) provided in the used fuel storage pool, and As shown in the figure, it is transferred to a fuel storage rack 2 and stored. In this case, the fuel exchange FiM
Since the mast 4 of No. 3 is structured to grip the handle of the fuel assembly, the fuel channel 1 which does not have a handle
Unable to grasp and use the carapace.

For this reason, the fuel channel 1 is gripped by the fuel channel handling tool 7 attached to the wire tips of the auxiliary voices 1 to 5 mounted on the fuel exchanger 3, and the vertical movement is carried out by hoisting and lowering the auxiliary hoist 5. It is done through movement. In addition, the reference numeral 8 indicates an air hose for supplying driving air to the air cylinder provided in the fuel channel τ/channel extractor, and the reference numeral 9 indicates an operating ball for manually assisting the work. .

As shown in FIG. 6, the fuel 131 channel handling shell 7 is
A hook 12 is attached to the upper end of the frame 10 via a connector 11 to which a wire row 76 from the auxiliary hoist 5 can be connected.

The frame 10 is provided with a gripping mechanism 13 that grips the fuel channel 1 via triangular clips 1a provided at diagonal positions at the upper end of the fuel channel 1. The gripping mechanism 13 is equipped with an air cylinder 15 for advancing and retracting the actuator 14, and an air hose 8 for supplying driving air to the air cylinder 15 is connected to the air cylinder 15 via an air supply pipe 16.

The operating shaft 14 is connected to a pair of hooks 18 via a link mechanism 17.
Each hook 18 is connected to the actuating shaft 14')
j, so that it can rotate around a fulcrum 19. FIG. 6 shows a state in which the operating shaft 14 is retracted toward the air cylinder 15. In this state, the claw 2o at the tip of the hook 18 does not come into contact with the grip 1a of the fuel channel 1, and the opening 20 at the upper end of the fuel channel 1 can pass through.

On the other hand, FIG. 7 shows a state in which the actuating shaft 14 is pushed out by the air cylinder 15. In this state, the claw 20 at the tip of the hook 18 engages with the clip 1a at the upper end of the fuel de-sennel 1, and the fuel is transferred through the clip 1a. It will be in a state where channel 1 is gripped. In addition, the code|symbol 22 shows a corner guide,
Reference numeral 23 indicates a guide.

(Problem to be Solved by the Invention) Fuel channel 1 is removed using a conventional fuel channel handling tool.
When transferring a single unit, the wire lobes 6 of the auxiliary voices 1 to 5 hold the fuel channel (non-flank 1), so positioning in the rotational or horizontal direction must be assisted by the operation ball 9 from the top of the fuel exchanger 3. was there.

In addition, for vertical positioning, position detection II
4 m, it is not possible to perform accurate positioning at any position in the vertical direction, and when gripping the fuel channel 1 with the gripping mechanism 13, the operator must visually check the gripping mechanism 13.

The fuel channel 1 is a wire lobe 6 that is not rigid.
Because it is hanging only by its own weight, the fuel channel 1
When attaching the IpTi to something that has an inner diameter slightly larger than the outer diameter of the fuel channel 1, such as the fuel storage rack 2, the work is difficult because accurate positioning cannot be performed, and the fuel exchanger 3 Positioning was done by visual inspection from above, making the work extremely inefficient.

On the other hand, the fuel channel 1 is connected to the conventional λ
It has become common practice to measure the external dimensions of the used fuel channel (Nonnel 1) with a dimension measuring device and reuse it if it is within the specified values. In this case, it is necessary to measure the dimensions of the fuel channel 1 of a large amount of fuel, and in this case, it is necessary to transfer the fuel channel 1 from the fuel storage rack 2 to the dimension measuring device in a short time, and then return it to the fuel storage rack 2 after measurement, which is unprecedented. Efficient work is required.Also, when attaching new fuel to the fuel channel 1 to be reused, it is necessary to transfer the fuel channel 1 to the channel plate 1112g1, and the conventional fuel channel cannot be used with the binding device 10. Work efficiency is poor and it is not desirable in terms of preventing radiation exposure of workers.

The present invention has been made in consideration of the above-mentioned circumstances, and provides a fuel channel handling tool that can easily and accurately position a fuel channel and efficiently perform fuel channel transfer work. The purpose is to

[Structure of the invention]

(Means for Solving the Three Problems) A fuel channel handling tool according to the present invention includes a gripping part that can be gripped by a gripper provided at the tip of a mast of a fuel exchanger, and a gripping mechanism that grips the upper end of the fuel channel. , and a guide rod that simulates the weight of a fuel assembly.

(Function) The gripping part of the fuel channel handling tool is gripped by the gripping tool provided at the end of the mast of the fuel exchanger, and the tool is moved onto the single fuel channel stored in a fuel storage rack, etc., and the upper end of the fuel channel is removed by the gripping mechanism. After gripping the part, the fuel exchanger transfers and positions the fuel channel. In this case, the fuel channel handling tool has a gripping part that can be gripped by a gripper provided at the tip of the mast for refueling, and a guide rod that simulates the weight of the fuel assembly. A single fuel channel can be handled in the same way as a body, accurate positioning can be easily performed, and the fuel channel can be transferred efficiently.

(Embodiment) An embodiment of the fuel channel handling tool according to the present invention will be described with reference to the accompanying drawings.

In FIG. 1, the fuel channel handler 7A has an M6 frame 25, and a grapple 27 as a gripper is provided at the tip of the mast 4 of the fuel exchanger 3 via a reinforcing plate 26 at the -F end of the frame 25. The handle 28, which serves as a grippable portion, is fixed. Handle 2
8 is formed in a shape that simulates the upper tie plate handle of the fuel assembly.

The frame 25 is provided with a gripping mechanism 29 capable of gripping the fuel channel 1 via a clip 1a. Gripping mechanism 2
Made at 9! Air cylinder 31 that advances and retreats IJ @30
An air hose 32 for supplying air for driving the air cylinder 31 is connected to the air cylinder 31 via an air supply pipe 33.

A pair of hooks 35 are connected to the tip of the operating shaft 30 via a link 8N structure 34, and these hooks 35 are attached to the operating shaft 3.
0 moves forward and backward, so that it rotates around the fulcrum 36. FIG. 1 shows a state in which the operating shaft 30 is pushed out from the air cylinder 31, and in this state, the claw 37 provided at the tip of the hook 35 is engaged with the clip 1a formed at the upper end of the fuel channel 1. becomes.

Although not shown, when the actuating shaft 30 is pulled into the air cylinder 31, the claw 37 of the hook 35 is detached from the clip 1a, and the claw 37 is attached to the upper end of the fuel channel 1 without touching the clip 1a. It can pass through the opening 38 formed. In addition, code 3
Reference numeral 9 indicates a guide for pressing the clip 1a from above.

An id rod 40 is connected to the frame 25, extending in the vertical direction and simulating a weight of a fuel assembly.

This guide rod 40 is connected to the opening 38 of the fuel channel 1.
It has a function as a guide when inserting the hook 35 into the hole. Further, the guide rod 40 is longer than the entire length of the fuel channel 1, and when the fuel channel 1 is placed on a rack or the like, the tip 40a of the guide rod 40 comes into contact with the bottom of the rack or the like. No axial load is applied to the fuel channel 1.

Next, the operation of the above embodiment will be explained with reference to FIG. 2 J3 and FIG. 3.

First, the handle 28 of the fuel channel handling tool 7A is grasped by the grapple 27 provided at the lower end of the mast 4 of the fuel exchanger 3, and the fuel channel handling tool 7A is attached to the fuel channel 1 shell stored in the fuel storage rack 2. Move up. Then, the guide rod 40 of the fuel channel handling tool 7A is inserted into the opening 38 of the fuel channel 1, and the hook 35 is guided by the guide rod 40 into the opening 38 of the fuel channel 1.
Insert into 8. In this case, the operating shaft 30 is connected to the air cylinder 3
The hook 35 is in a state of being pulled toward the first side, and the hook 35 can be closed and passed through the first opening 38.

After the claw 37 of the hook 35 passes through the opening 38, air is supplied from the air hose 32 to the air cylinder 31 to complete the operation.
h N 30 is pushed out, and the hook 35 is rotated to release the claw 3.
7 into the clip 1a of the fuel channel 1.

After gripping the fuel channel 1 in this way, the fuel exchange 13
The fuel channel 1 is lifted up, moved within the spent fuel storage pool, and moved onto the channel dimension measuring device 42 installed in the CR rack 11. Then, extend the mast 4 and connect the fuel channel 1 to the channel dimension measuring device 4.
Insert from the upper opening of 2. In this case, since the clip 1a of the fuel channel 7 is held down by the guide 39 provided on the fuel channel handling tool 7A', the clip 1a overcomes the friction caused by the horizontal load due to contact with the senna and guide in the channel 1 method measuring instrument 42. , can be inserted into the channel size measuring device 42 and placed therein.

As described above, according to the above embodiment, the handle 28 which can be gripped by the grapple 27 provided at the tip of the 7th stroke 4 of the fuel exchanger 3 is bent, and the guide rod 40 simulating the executive of the fuel assembly is provided. , one fuel channel Iti can be handled by refueling R3 in the same manner as when handling a fuel assembly. Therefore, positioning in the horizontal, rotational, and vertical directions can be performed accurately and easily, and the moving speed in the axial and horizontal directions can be freely set. Work can be done extremely efficiently. As a result, work 0 can be protected from radiation exposure.

[Effects of the Invention] The fuel channel handling tool according to the present invention can be used for fuel exchange PIj!
Mass 1 of the container: Since it is equipped with a gripping part that can be gripped by a gripper provided at the tip, a gripping mechanism that grips the upper end of the fuel channel, and a guide rod that simulates the weight of the fuel assembly, the fuel channel alone can be easily gripped. Positioning can be performed easily and accurately, and the fuel channel transfer operation can be performed extremely efficiently.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a fuel channel handling shell according to the present invention, FIGS. 2 and 3 are layout diagrams showing the operation of the above embodiment, and FIG. 4 is a general fuel channel. FIG. 5 is a layout diagram showing the operation of a conventional fuel channel handling device, and FIGS. 6 and 7 are a perspective view of a conventional fuel channel handling device.
FIG. 3 is a sectional view showing a channel handling tool. 1...Fuel channel, 1a...Clip, 7A...
...Fuel channel handling tool, 27...Grapple, 2
8... Handle, 29... Gripping mechanism, 40... Guide rod. Applicant's agent Hisashi Hatano Figure 1 Figure Figure Figure Figure Figure Figure Figure

Claims (1)

[Claims] It is characterized by comprising a gripping part that can be gripped by a gripper provided at the tip of the mast of the fuel exchanger, a gripping mechanism that grips the upper end of the fuel channel, and a guide rod that simulates the weight of the fuel assembly. Fuel channel handling equipment.