JPH0151157B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a fuel channel handling tool, and in particular, to a fuel channel handling tool suitable for attaching and detaching a fuel channel and moving and storing it in a spent fuel storage rack. Concerning fuel channel handling equipment.

(Prior Art) Fuel assemblies installed in the core of a nuclear reactor become spent fuel assemblies after long-term use.

Traditionally, in preparation for transporting spent fuel assemblies from a plant for reprocessing, fuel assemblies are separated into fuel bundles and fuel channels, and each is stored separately in spent fuel storage racks. .

FIG. 1 is a diagram showing the configuration of such a conventional fuel channel handling tool 1. As shown in FIG.

That is, as a guide when covering the top surface of the fuel channel 2, a guide 4 is fixed to the side surface of the frame 3 and uses opposing corners on the outside of the fuel channel 2, and a clip 5 on the top surface of the fuel channel 2 is placed on the top surface of the fuel channel 2. A stopper 6 for directional positioning, a claw 7 that hooks onto the lower surface of the clip 5 on the upper surface of the fuel channel 2, two arms 8 to which the claws 7 are fixed, and a frame that serves as the rotation center of the arm 8. The first pin 9 is fixed to 3
, a movable link 10 connecting the two arms 8 as a pair, a second pin 12 passing through the long hole 11 of the arm 8 and fixed to the movable link 10, and a movable link 10 for operating the movable link 10. shaft 13
, a knob 14 at the tip of the shaft 13, a handle 15 that serves as a hanger for the entire handling tool, a support plate 16 that connects the handle 15 and the frame 3, and a pipe 1.
7, and a stop block 18.

Operations using the fuel channel handling tool having such a configuration will be described below with reference to FIG. 2.

First, spent fuel assemblies taken out from the reactor core (not shown) are placed on a movable platform 23 of the fuel channel attachment/detachment machine 22 installed on the wall surface of the fuel pool 20 and below the surface of the cooling water 21, which can be raised and lowered. Equipped with 24.

The fuel assembly 24 is composed of a fuel bundle and a fuel channel 2.

Next, from above the fuel exchange floor surface 25, the guide 4 shown in FIG.

Thereafter, the knob 14 is manually rotated in the direction in which the claw 7 is opened, and the claw 7 is hooked onto the lower surface of the clip 5 of the fuel channel 2, so that the fuel channel 2 is in a gripping state.

At this time, the stop block 18 is held in a channel handling tool holder 26 that has been previously installed at the center of the fuel assembly.

When the movable base 23 is lowered after the stop block 18 is held in the channel handling tool holder 26, the fuel bundle descends together with the movable base 7 due to its own weight, and the fuel channel 2 is caught on the claw 7.
It remains in its original state.

Further, the remaining fuel channels 2 are temporarily stored in a temporary channel storage rack 27 installed on the wall inside the fuel pool 20.

In addition, the reference numeral 28 in the figure indicates the spent fuel storage rack 2.
9 indicates the top handle of the fuel bundle.

(Problems to be Solved by the Invention) As described above, the above-mentioned conventional channel handling tool has the problem that the gripping operation of the fuel channel 2 is done manually, which requires a lot of time. 2 is held in the spent fuel storage rack 28, the total length of the fuel channel 2 is l ₂ and the insertion depth of the spent fuel storage rack 11 is
Assuming L ₁ , since the relationship is l ₂ > l ₁ ,
The top surface of fuel channel 2 is spent fuel storage rack 8
With a conventional channel handling tool that is lower than the top surface and has a guide 4 on the outside, the guide 4 becomes an obstacle and cannot be handled. There was a problem that it could not be moved and stored in the rack 28.

The present invention has been made in view of the above-mentioned conventional circumstances, and its first purpose is to improve the handling of the fuel channel 2 by making it possible to quickly open and close the claw 7 by remote control. can be done quickly,
Moreover, it is possible to reduce the radiation exposure of workers.

The second purpose is to have a guide that uses the inner corner of the fuel channel 2 as a guide, so that the fuel channel 2 can be moved and stored from the channel storage rack 27 to the spent fuel storage rack 28. .

[Structure of the Invention] (Means for Solving the Problems) That is, the present invention provides a structure in which a fuel assembly is fixed to a frame and a side plate and has no opposing clips on the inside of the fuel channel as a guide when covering the upper surface of a fuel channel of a fuel assembly. a guide having a corner portion as a guide and having a groove portion for preventing interference with a post of an upper tie plate vertically installed at an opposing corner portion without a clip inside the fuel channel during the guide; A stopper for positioning in the height direction by applying to the clip on the upper surface, a claw for hooking on the lower surface of the clip on the upper surface of the fuel channel, an arm to which this claw is fixed, and this arm are connected as a pair. a movable link, a first pin serving as a rotation center of the arm, a second pin passing through an elongated hole of the arm and fixed to the movable link, a cylinder for operating the movable link, and the cylinder. A supporting frame, a tube supplying a pressure source to the cylinder, a plug connector and a socket connector, a handle serving as a hanging device for the entire handling tool, and a pipe connecting the frame. This is a fuel channel handling tool.

(Function) Therefore, the claw can be opened and closed by remote control using the cylinder, and by the guide guided by the inside of the fuel channel 2,
The fuel channel 2 can be quickly moved and stored in the spent fuel storage rack 11.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIGS. 3 and 4, a guide 31 is attached to the lower end of the fuel channel handling tool 30, which utilizes the inner opposing corners of the fuel channel 2 as a guide when covering the upper surface of the fuel channel 2,
This guide 31 is fixed to a frame 32 and a side plate 33. Further, along the axial direction, that is, the vertical direction of the guide 31, the fuel channel 2
A groove n is formed to avoid interference with the post m of the upper tie plate of the fuel bundle housed within.

Further, a stopper 34 is attached to the clip 5 on the upper surface of the fuel channel 2 for positioning in the height direction, and the stopper 34 is fixed to the lower surface of the first cover plate 35 and the side plate 33. This first cover plate 35
The upper end of is fixed to the frame 32.

By the way, as shown in FIG. 4, the clip 5 is fixed to a pair of opposing corners of the inner upper end of the fuel channel 2 so as to cover the upper surface thereof, and is shaped like a triangular plate. There is.

A claw 36 hooked on the lower surface of the clip 5 is fixed to two arms 37, and
7 opens and closes with the first pin 38 as the center of rotation.

The two arms 37 are connected as a pair by a movable link 39, and are configured to open and close at the same time by a second pin 41 that passes through a long hole 40 of the arm 37 and is fixed to the movable link 39. .

Furthermore, the moving link 39 opens and closes the arm 37 by moving the shaft 43 of the air cylinder 42 in and out.

Further, the arms 37 are arranged so that they do not interfere with the upper handle 29 of the fuel bundle when the arms 37 are in the closed position.
The seam of 7 is cut out, and the arm 3
A projection is provided at the joint of both arms 37 as a stopper when the arm 7 is closed.

The air cylinder 42 is fixed to the frame 32 with a nut 44, and is further connected to a tube 45, a plug connector 46, and a socket connector 47 for supplying air pressure, and is connected to the air cylinder 42 on the fuel exchange floor 25 shown in FIG. Directed to an air source (not shown).

Note that the plug connector 46 and the socket connector 47 are fixed to a second cover plate 48.

A second cover plate 48 is fixed to the frame 32.

Further, a handle 49 is provided on the upper part of the frame 32, which serves as a hanging device for the entire handling tool, and the frame 32, pipe 50, stop block 52,
The support plate 51 and the handle 49 are connected in this order.

The operation of the fuel channel handling tool having such a configuration will be described below.

First, as shown in FIG. 2, after the fuel assembly is mounted on the movable table 23 of the fuel channel attachment/detachment machine 22, this handling tool is supported from above the fuel pool 20 so as to be able to rise and fall and is gradually lowered to the upper surface of the fuel channel 2. , is inserted into the inside of the fuel channel 2 while being guided by the guide 31 of this handling tool.

Thereafter, the handling tool is further lowered and the stopper 34 is brought into contact with the upper surface of the clip 5 of the fuel channel 2, whereby positioning in the height direction is automatically performed.

During the downward movement of the guide 31, the post m of the upper tie plate protruding from the inner corner of the fuel channel 2 is accommodated in the groove n of the guide 31, so there is no interference between the post m and the guide 31. do not have.

Next, the opening operation of the claw 36 will be explained.

First, working air is introduced into the air cylinder 42 from a plug connector 46 connected to an air source (not shown) on the fuel exchange floor 25 to extend the air cylinder 42 and lower the shaft 43.
As the shaft 43 descends, the shaft 43
The moving link 39 connected to the tip of the moving link 39 also descends.

At this time, the socket connector 47 side is the working air exhaust side.

When the movable link 39 descends in this manner, the left and right pairs of arms 37 are pushed down by the second pin 41 fixed to the movable link 39, and rotate in opposite directions about the first pin 38 as the rotation axis. Both arms 37 are expanded.

Due to this rotation of the arm 37, the claw 36 at the lower end of the arm 37 performs an opening operation, and the fuel channel 2
A claw 36 is engaged with the lower surface of the clip 5.

By the above operations, the setting of this handling tool to the fuel channel 2 is completed.

At this time, the stop block 52 is held in the channel handling tool holder 26, which is previously installed at the center of the fuel assembly.

After holding the stop block 52 in the channel handling tool holder 26, the fuel channel attachment/detachment machine 2
When the movable base 23 of No. 2 is lowered, the fuel channel 2 is caught by this handling tool and separated from the fuel bundle. In this way, the operation of extracting the fuel channel 2 is completed.

Next, in order to store the fuel channel 2 in the spent fuel storage rack 28, the fuel channel 2 suspended from this handling tool is moved to a predetermined spent fuel storage rack 28 and positioned. Storing the fuel channel 2 into a predetermined spent fuel storage rack 28.

After the fuel channel 2 is stored in the predetermined spent fuel storage rack 28 in this way, the claw 36 is closed and the main handling tool and the fuel channel 2 are separated.

This separation operation will be explained below.

Working air is introduced into the air cylinder 42 from a socket connector 47 connected to an air source (not shown) on the fuel exchange floor 25, and the air cylinder 42
to contract. As the air cylinder 42 contracts, the shaft 43 rises, and the moving link 39 connected to the tip of the shaft 43 also rises.

At this time, the plug connector 46 side is the working air exhaust side.

When the moving link 39 rises, the moving link 39
A pair of left and right arms 37 are pulled upward by a second pin 41 fixed to the second pin 41 . 1st pin 3
8 as the rotation axis and rotate in opposite directions.

Due to this rotation of the arm 37, the claw 36 at the lower end of the arm 37 performs a closing operation, and the fuel channel 2
The claw 36 is removed from the bottom surface of the clip 5. In this way, a series of operations for handling the fuel channel 2 is completed.

[Effects of the Invention] As is clear from the above description, the fuel channel handling tool of the present invention has the following advantages: firstly, the claw 36 can be opened and closed remotely using air pressure, reducing the risk of radiation exposure to workers; Work can be done quickly and reliably without being affected by water surface ripples or light reflections.

Second, in addition to guiding the inside of the fuel channel 2, a groove is formed in the guide 31 to avoid interference with the post of the upper tie plate. It is now possible to directly store the fuel channel, and the installation and removal work of the fuel channel 2 on the fuel channel attachment/detachment machine 22 and the movement and storage work to the spent fuel storage rack 28 can be carried out using the same handling tool, which saves labor. This makes it possible to reduce the amount of work and work time, and the effects are very large.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view of a conventional fuel channel handling device, FIG. 2 is a sectional view of a fuel pool, and FIG. 3 is a partially sectional view of an embodiment of a fuel channel handling device according to the present invention. 4 is a front view shown in FIG. 3, and FIG. 2... Fuel channel, 4... Guide, 5...
Clip, 6... Stoppa, 7... Claw, 8...
Arm, 14... Knob, 20... Fuel pool, 2
2...Fuel channel handling device attachment/detachment machine, 27...Channel storage rack, 28...Spent fuel storage rack, 31...Guide, 34...Stopper, 36
...Tlaw, 37...Arm, 42...Air cylinder, m...Upper tie plate post, n...
groove.

Claims (1)

[Claims] 1. When placing the fuel assembly on the upper surface of the fuel channel, use the opposing corner portions fixed to the frame and side plate and without clips on the inside of the fuel channel as guides, and at the time of this guidance, use the opposing corners on the inside of the fuel channel as guides. a guide having a groove for preventing interference with a post of an upper tie plate vertically installed at a corner without a clip; and a guide that is applied to the clip on the upper surface of the fuel channel;
a stopper for positioning in the height direction; a claw to be hooked to the lower surface of the clip on the upper surface of the fuel channel; an arm to which the claw is fixed; a movable link connecting the arms as a pair; a first pin serving as a rotation center; a second pin passing through a long hole in the arm and fixed to the movable link; a cylinder for operating the movable link; and a frame supporting the cylinder. , a tube for supplying a pressure source to the cylinder, a plug connector and a socket connector;
A fuel channel handling tool characterized by comprising a handle serving as a hanging device for the entire handling tool and a pipe connecting the frame.