JPH08233983A - Storage facility of spent nuclear fuel - Google Patents

Abstract

PURPOSE: To enable support plat horizontally moving smoothly without resistance because the support plate is held in the inner wall of a pit by way of a connection link with vertical pins inserted at both ends when the support plate is locally heated and thermally expanded and the horizontal movement over a predetermined distance is surely prevented owing to the touch of both flanges in the case the support plate horizontally moved in excess due to an earthquake and the like. CONSTITUTION: When a support plate 1 supporting a cell containing spent nuclear fuel is supported on the inner wall 2a of a pit 2 by way of a fixing parts 11 and 13 and a connection link 16, the connection parts of the connection link 16 and the fixing parts 11 and 13 are connected with vertical pins 14, 15, the insertion hole formed in the one vertical pin 14 is prolonged a little and the gap between the flanges 11a and 13a of both fixing parts 11 and 13 is set so as to prevent the horizontal movement of the support plate 1 over a predetermined distance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spent nuclear fuel storage facility.

[0002]

2. Description of the Related Art A storage facility for spent nuclear fuel has already been disclosed in Japanese Utility Model Publication No. 2-16319.

In this storage facility, a plurality of cylindrical rack cells for storing spent nuclear fuel are arranged in a pit for storing cooling water, and a rack support plate for connecting these rack cells is provided. It has been done.

As shown in FIGS. 3 and 4, the rack support plate 51 is held by an embedding plate 53 embedded in the pit wall 52 via a relative displacement absorbing joint 54.

The relative displacement absorption joint 54 is a holder 5 for slidably holding the pier portion 51a of the rack support plate 51.
5 and a fixing fitting 56 for fixing the holder 55 to the embedded plate 53 side. The height of the space portion 57 of the sliding portion on the holder 55 side is determined by the rack support plate 5
Therefore, when the rack support plate 51 is thermally expanded by the heat of the spent nuclear fuel, the vertical and horizontal directions can be absorbed by the gaps c and d, respectively.

[0006]

However, according to the above-mentioned conventional structure, the rack support plate 51 is certainly held by the holder 55 so that it can slide in a predetermined horizontal direction. Are not necessarily all stored at the same time, for example, when they are stored unevenly, they are locally heated, and as shown in FIG.
There is a problem in that the pier portion 51a is deformed, and the rack support plate 51 cannot slide smoothly, so that an unreasonable force acts on the rack support plate 51.

Therefore, an object of the present invention is to provide a storage facility for spent nuclear fuel that can solve the above problems.

[0008]

In order to solve the above problems, in the spent nuclear fuel storage facility of the present invention, a plurality of cylindrical storage bodies for storing the spent nuclear fuel are provided in a pit for storing cooling water. In the storage facility for spent nuclear fuel, which is arranged and has a support plate for connecting each of the cylindrical containers, the one end is connected to the edge of the support plate via the first vertical pin, and The supporting plate is held on the pit side by a connecting plate body having the other end connected to the inner wall of the pit via the second vertical pin, and the connecting hole between the first vertical pin and the supporting plate side. When the connecting plate body swings around the axis of the second vertical pin, a gap is formed to allow a change in the axial length of the connecting plate body caused by the swing. The load receiving plate that prevents horizontal movement of the plate over a specified distance But on the pit side.

[0009]

According to the above construction, even if the support plate is locally heated and thermally expanded, for example, the support plate is held on the inner wall portion of the pit through the connecting plate body having the vertical pins inserted at both ends. Therefore, unlike the structure in which the inside of the cylindrical space is slid and guided, for example, it is possible to smoothly move horizontally without any resistance.

When the support plate excessively moves in the horizontal direction due to an earthquake or the like, the load receiving plate prevents the horizontal movement of a predetermined distance or more.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 denotes a support plate for supporting a plurality of cylindrical storage bodies (not shown, also called cells) for storing spent nuclear fuel at a vertical position in a pit 2, and a peripheral edge thereof. It is held on the inner wall portion 2a of the pit 2 by a connecting device 3 provided at a plurality of positions at predetermined intervals.

The connecting device 3 includes a peripheral portion 1a of the support plate 1.
A first mounting member 11 having a U-shape (groove shape) in a side view, which is fixed by welding to the inner wall portion 2a of the pit 2 at a position facing the first mounting member 11, with a projecting plate 12 interposed therebetween. A second mounting member 13 having a U-shape (groove shape) in side view fixed by welding, one end of which is connected to the first mounting member 11 via the first vertical pin 14 and the other end of which is The connecting link (connecting plate body) 16 is connected to the second mounting member 13 via the two vertical pins 15.

Then, the lower flange portion 11a of the first mounting member 11 and the lower flange portion (load receiving plate) 13a of the second mounting member 13 are projected from each other, and the supporting plate 1 is horizontally positioned at a predetermined distance or more. It is designed to prevent movement. That is, the gap a between the tip portions of the flange portions 11a and 13a is set to a distance that can prevent the shaking when the shaking greatly occurs due to an earthquake or the like.

The first link is formed on the side of the connecting link 16.
Insertion hole (connection hole portion) 17 through which the vertical pin 14 is inserted
Is extended by a predetermined distance b in the longitudinal direction of the connecting link 16, and when the support plate 1 horizontally moves in a direction orthogonal to the longitudinal direction of the connecting link 16, Second vertical pin 15 and first vertical pin 1
The distance from 4 can be absorbed.

In the above structure, even if the support plate 1 is locally heated and thermally expanded, for example, the support plate 1 is connected to the pit 2 via the connecting links 16 in which the vertical pins 14 and 15 are inserted at both ends. Since the support plate 1 is held by the inner wall portion 2a, the entire support plate 1 is supported so as to be able to move in parallel and to be capable of minute rotation. Support is possible. For example, unlike the configuration shown in the conventional example in which the holder slides in the space in the holder, the support plate can move horizontally smoothly without any resistance.

When the support plate 1 excessively moves in the horizontal direction due to an earthquake or the like, the flange portions 11a and 13a of the two mounting members 11 and 13 come into contact with each other, so that further horizontal movement is ensured. Be blocked. That is, the compressive load is supported by the flange portions 11a and 13a, and the tensile load is supported by the connecting link 16.

[0017]

As described above, according to the configuration of the present invention, even if the support plate is locally heated and thermally expanded, for example,
Since the support plate is held on the inner wall portion of the pit through the connecting plate body in which the vertical pins are inserted at both ends, for example, as shown in the conventional example, it is configured to slide in the space portion in the holder. In contrast, the support plate can move smoothly horizontally without any resistance, and therefore, the support plate itself is not subjected to excessive force.

Further, when the support plate excessively moves in the horizontal direction due to an earthquake or the like, the load receiving plate reliably prevents the horizontal movement of a predetermined distance or more.

[Brief description of drawings]

FIG. 1 is a plan view of a coupling device in a storage facility according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a coupling device in the storage facility of the same embodiment.

FIG. 3 is a perspective view of a displacement absorption joint section in a storage facility of a conventional example.

FIG. 4 is a cross-sectional view of a displacement absorption joint section in a conventional storage facility.

FIG. 5 is a horizontal cross-sectional view of an essential part for explaining the operation of a displacement joint part in a conventional example.

[Explanation of symbols]

 1 Support Plate 1a Peripheral Part 2 Pit 2a Inner Wall Part 3 Connection Device 11 First Mounting Member 11a Lower Flange Part 13 Second Mounting Member 13a Lower Flange Part 14 First Vertical Pin 15 Second Vertical Pin 16 Connection Link 17 Insertion Hole

Claims (1)

[Claims] 1. A use in which a plurality of cylindrical containers for storing spent nuclear fuel are arranged in a pit for storing cooling water, and a support plate for connecting the cylindrical containers to each other is provided. In the nuclear fuel storage facility, a connecting plate having one end connected to the edge of the support plate via a first vertical pin and the other end connected to the inner wall of the pit via a second vertical pin. When the support plate is held by the body on the pit side and the connecting plate body swings around the axis of the second vertical pin in the connecting hole portion between the first vertical pin and the support plate side, A load receiving plate is formed on the pit side to form a gap that allows a change in the axial length of the connecting plate body caused by the swing and to prevent the supporting plate from moving horizontally beyond a predetermined distance. Storage facility for spent nuclear fuel characterized by.