JPH10142387A - Spent fuel storage rack and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce machining time and assembly time and to provide a storage rack for preventing thermal deformation and residual stress from occurring due to welding by providing a band-shaped partition plate having a mounting hole on a side end face that contacts the through hole position of a flat-plate- shaped partition plate that is provided orthogonally to the flat-plate-shaped partition plate and a mounting site for connecting the flat-plate-shaped screening plate and the band-shaped partition plate. SOLUTION: A mounting hole 35 is provided on the side end face of a fuel storage cell 23. A flat-plate-shaped partition plate 31 has a length that matches the length in axial direction of a fuel assembly 7 and the width of a spent fuel storage rack 20 where a plurality of fuel storage cells 23 are provided together, a plurality of through holes 37 that are machined for each pitch of one cell of the fuel storage cell 23 are provided corresponding to the mounting hole of the band-shaped partition plate 32, and the inner diameter of the through hole 37 is set smaller than the plate thickness (side end face width) of the band- shaped partition plate 32. A spring pin 34 or a connection bolt 36 is inserted into the through hole 37 and the mounting hole 35, thus connecting the flat-plate- shaped partition plate 31 and the band-shaped partition plate 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spent fuel storage rack for storing spent fuel assemblies taken out of a nuclear reactor in a fuel pool and a method of manufacturing the same.

[0002]

2. Description of the Related Art Generally, in a nuclear power plant, after operating a nuclear reactor for a certain period, spent fuel is taken out of a reactor core and installed in a fuel pool before reprocessing of the taken out spent fuel. The fuel is stored and stored in a spent fuel storage rack, which is cooled to remove decay heat of the fuel.

In recent years, in order to respond to a demand for effectively utilizing the space in the fuel pool to increase the storage capacity,
Spent fuel storage racks capable of increasing compactness have been proposed. For example, a material having a large neutron absorption capacity is interposed between the stored fuels to reduce the distance between the stored fuels while maintaining the subcriticality of the fuels, and this material is used to support the stored fuels even during an earthquake. A spent fuel storage rack that has also been used as a strength member has been proposed.

[0004] As a typical example of such a spent fuel storage rack, boron containing excellent neutron absorption capacity is contained.
There is known a so-called lattice plate-shaped fuel storage cell structure in which boron-added stainless steel having good structural strength is used, and one piece of boron-added stainless steel is interposed between stored fuels.

[0005] For example, a spent fuel storage rack disclosed in JP-A-5-80188 satisfies such conditions. In this configuration, a first grid plate provided with protrusions and a second grid plate provided with slits are combined in a grid pattern, and their intersections are combined to form a fuel storage cell.

FIG. 8 is a plan view of such a spent fuel storage rack 20, and FIG. 9 is an explanatory view of a combination of a first grid plate 21 and a second grid plate 22. As shown in FIG. 9, a projection 24 and a recess 25 are provided on the back surface of the first lattice plate 21, and the projections 24 of the first lattice plate 21 are formed on the second lattice plate 22. A slit 26 is provided correspondingly. The projections 24 of the first lattice plate 21 are inserted through the slits 26 of the second lattice plate 22 and fitted into the recesses 25 on the back surface of the adjacent first lattice plate 21 to be combined in a lattice shape.

More specifically, the spent fuel storage rack 20 is composed of a plurality of first grid plates 21 and second grid plates 22 which are combined in a grid pattern and fitted and fixed to each other, as shown in FIG. The provided fuel storage cell 23 is formed. Then, although not shown in FIG. 8, it is integrally mounted on the base 3 with bolts and nuts on the bottom surface of the fuel pool. The plurality of fuel assemblies 7 are individually inserted into the fuel storage cells 23 and are joined and supported by seat holes (not shown) on the base 3.

FIG. 10 is an enlarged vertical sectional view taken along the line G--G in FIG. The first lattice plate 21 is provided with a plurality of protrusions 24 along one end surface thereof, and further, the opposite end surface is joined to the protrusion 24 of the adjacent first lattice plate 21. Recess 25 is formed. One size of the first grid plate 21 has a length corresponding to the axial length of the fuel assembly 7 and a width corresponding to the width of one fuel storage cell 23.

On the other hand, the second grid plate 22 is
And a width corresponding to the width of the spent fuel storage rack 20 in which the plurality of fuel storage cells 23 are arranged side by side. A plurality of slits 26 into which the projections 24 of one lattice plate 21 are inserted are machined.

The plurality of first grid plates 21 and the second grid plates 22 are arranged so as to intersect at right angles with each other on the plane of the spent fuel storage rack 20 and are formed in the slits 26 of the second grid plates 22. The projection 24 of the first lattice plate 21 is inserted, and the other first lattice plate 21 adjacent to the projection 24 of the first lattice plate 21 protruding from the second lattice plate 22.
Of the fuel storage rack 20 is formed.

The first grid plate 21 and the first grid plate 21 and the second grid plate 22 are welded to each other to be firmly fixed to each other by welding.
To form FIG. 11 is a sectional view taken along the line HH of FIG. 10, and FIG. 12 is a sectional view taken along the line II of FIG. As shown in FIG. 11, the intersection (the intersection on the concave portion 25 side) of the first lattice plate 21 and the second lattice plate 22 is welded as a welded portion 27 and firmly fixed to each other. Similarly, as shown in FIG. 12, in the portion where the slit 26 and the projection 24 are located, the projection 24 of the first lattice plate 21
The joint portion of the lattice plate 21 with the concave portion 25 is welded as a welded portion 27, and the first lattice portions 24 are firmly fixed to each other.

As described above, when manufacturing the spent fuel storage rack 20, one second grid plate 22
The plurality of first lattice plates 2
1 are arranged at right angles so that the concave portions 25 face each other, and the end side surface of the abutted first lattice plate 21 and the second lattice plate 22 are fixed to each other by welding, thereby assembling the first stage. Do.

Next, the second lattice plate 22 is placed on the projection 24 of the first lattice plate 21 of the first stage such that the slit 26 of the second lattice slope 22 of the second stage comes to the first lattice plate 21. The projections 24 of the lattice plate 21 of the second stage
To project the projection 24 from the slit 26.

Thereafter, the first grid plate 21 of the second stage is disposed so that the concave portion 25 is fitted with the projection 24 protruding from the slit 26, and the first grid plate 21 of the first stage is welded.
The first protrusion 24 is coupled to the second lattice plate 22 of the second stage and the concave portion 25 of the first lattice plate 21 of the second stage. Thereafter, the second grid plate 22 and the first grid plate 2
1 are sequentially stacked to manufacture the spent fuel storage rack 20.

[0015]

However, in such a conventional spent fuel storage rack, the projection 24 of the first grid plate 21 is projected from the slit 26 of the second grid plate 22 due to its structure. In this case, the welding is time-consuming, and thermal deformation and residual stress due to welding may occur.

That is, it is necessary to provide a rectangular slit 26 in the second grid plate 22 so that the total height is about a fraction of the total height for each pitch of one fuel storage cell 23. The same number of projections 24 to be inserted into the slits 26 must be provided on the first lattice plate 21 disposed at right angles. Therefore, it takes time for these many machining operations.

Further, even when assembling, a plurality of first
Since it is necessary to simultaneously insert the projections 24 of the lattice plate 21 into the many slits 26 of the second lattice plate 22, it takes time to assemble. In addition, because of the welding configuration, it is difficult to maintain assembly accuracy due to thermal deformation during welding, and residual stress due to heat may occur.

An object of the present invention is to provide a spent fuel storage rack and a method for manufacturing the same, which reduce the machining time and the assembling time and are free from thermal deformation and residual stress due to welding.

[0019]

According to a first aspect of the present invention, there is provided a plate-like partition plate having a plurality of through holes provided at substantially the same interval as the width of the fuel assembly, and a plate-like partition plate provided at right angles to the plate-like partition plate. A belt-shaped partition plate having a mounting hole on a side end surface abutting on a position of a through-hole of the flat-plate partition plate, and a mounting member inserted into the through-hole and the mounting hole and connecting the flat-plate partition plate and the strip-shaped partition plate. It is.

According to the first aspect of the present invention, the band-shaped partition plate is disposed at right angles to the plate-shaped partition plate such that the mounting holes provided on the side end surfaces thereof are in contact with the positions of the through holes of the plate-shaped partition plate. And the attachment member which couples a flat-plate-shaped partition plate and a strip-shaped partition plate is inserted in a through-hole and an attachment hole.

According to a second aspect of the present invention, in the first aspect of the present invention, a spring pin having a diameter larger than that of the through hole and the mounting hole is used as the mounting member.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, the spring pin inserted into the through hole and the mounting hole is
The spring force locks the plate-shaped partition plate and the band-shaped partition plate, thereby connecting the plate-shaped partition plate and the band-shaped partition plate.

[0023] The invention of claim 3 is the invention of claim 1 or claim 2.
In the invention of the above, a member longer than the through-hole of the plate-shaped partition plate is used as the mounting member, and is inserted into the through-hole of the plate-shaped partition plate and is also inserted into the mounting hole on the side end surface of the band-shaped partition plate. The plate and the band-shaped partition plate are combined.

According to the third aspect of the present invention, in addition to the functions of the first or second aspect, the mounting member longer than the through hole of the flat partition plate projects from the through hole of the flat partition plate. And the plate-shaped partition plate and the band-shaped partition plate are connected to each other.

The invention of claim 4 is the first to third aspects of the present invention.
In the invention, the mounting holes of the band-shaped partition plate attached to the first-stage plate partition plate and the final-stage plate-shaped partition plate are screw holes, the mounting members are connection bolts, and the connection bolts are connected through the through holes of the plate-shaped partition plate. Is inserted and screwed into the screw hole of the band-shaped partition plate to connect the plate-shaped partition plate and the band-shaped partition plate.

According to a fourth aspect of the present invention, in addition to the effects of the first to third aspects of the present invention, the connection between the flat partition plate and the band partition plate at the outer peripheral portion of the spent fuel storage rack is performed by connecting bolts with screw holes. And tightly joined.

According to a fifth aspect of the present invention, there is provided a flat partition having a plurality of grooves provided at substantially the same interval as the width of the fuel assembly, and a flat partition provided at a right angle to the flat partition. A band-shaped partition plate that abuts the groove position of the plate, and a reinforcing plate that is assembled by fixing the side end surfaces of the band-shaped partition plate in a grid shape so as to abut the groove position of the plate-shaped partition plate, and then surrounding the outer periphery with bolts and integrating them. It is provided with.

According to the fifth aspect of the present invention, the band-shaped partition plate is disposed at right angles to the plate-shaped partition plate such that the side end surface thereof comes into contact with the groove position of the plate-shaped partition plate. Then, after the band-shaped partition plate and the plate-shaped partition plate are combined in a lattice shape, the outer periphery thereof is surrounded by a reinforcing plate and fixed by bolts to be integrated.

According to a sixth aspect of the present invention, there is provided a belt-like partition plate having a plurality of through-holes at substantially the same interval as the width of the fuel assembly, and a belt-like shape having a mounting hole at a side end face abutting the through-hole position of the flat-plate partition plate. Prepare a partition plate, and vertically attach a plurality of band-shaped partition plates to the plate-shaped partition plate through connection bolts from the through holes of the plate-shaped partition plate to the screw holes provided in the mounting holes of the band-shaped partition plate,
The strip-shaped partition plate is combined so that the through-hole of another flat-plate partition plate is aligned with the mounting hole position at the other end, and the mounting member is inserted into the through-hole and the mounting hole to connect the strip-shaped partition plate and the flat-plate partition plate. ,
By repeating this procedure, another band-shaped partition plate and a plate-shaped partition plate are sequentially connected, and the final-stage plate-shaped partition plate is integrated by connecting bolts.

According to the invention of claim 6, first, a plurality of band-shaped partition plates are vertically attached to the plate-shaped partition plate located on the outer periphery by connecting bolts. Then, the strip-shaped partition plate is combined so that the through-hole of another flat-plate partition plate fits into the mounting hole position at the other end, and the strip-shaped partition plate and the flat-plate partition plate are inserted by inserting the mounting member into the through-hole and the mounting hole. Point of intersection. Then, by repeating this procedure, another band-shaped partition plate and a plate-shaped partition plate are sequentially joined, and the final-stage plate-shaped partition plate is integrated by connecting bolts.

[0031]

Embodiments of the present invention will be described below. FIG. 1 is an explanatory diagram of the first embodiment of the present invention. FIG. 1A shows a spent fuel storage rack 20 of the present invention.
FIG. 1B is an explanatory view of a combination of a plate-shaped partition plate 31 and a band-shaped partition plate 32 at an intermediate portion of the spent fuel storage rack 20 according to the first embodiment. 1
(C) is an explanatory view of a combination of the first-stage and last-stage plate-shaped partition plates 31 and the band-shaped partition plates 32 in the first embodiment.

The spent fuel storage rack 20 according to the first embodiment of the present invention comprises a plurality of flat partition plates 31 and a strip partition plate 32 as shown in FIGS. 1 (b) and 1 (c). As shown in FIG. 1 (a), the intersections of the plate-shaped partition plate 31 and the band-shaped partition plate 32 are fixed to each other to form a plurality of fuel storage cells 23 arranged in a square, as shown in FIG. It is integrally fixed on the base 3 with bolts and nuts on the bottom surface of the fuel storage pool. Then, the plurality of fuel assemblies 7 are individually inserted into the fuel storage cells 23 and fitted and supported in seat holes (not shown) on the base 3.

The band-shaped partition plate 32 has a length corresponding to the axial length of the fuel assembly 7 and a width corresponding to the width of one fuel storage cell 23, and is shown in FIGS. 1B and 1C. The mounting hole 35 is provided in the side end surface as shown in FIG. on the other hand,
The flat partition plate 31 has a length corresponding to the axial length of the fuel assembly 7 and a width corresponding to the width of the spent fuel storage rack 20 in which the plurality of fuel storage cells 23 are arranged in parallel. 1
As shown in FIG. 1B and FIG. 1C, a plurality of through holes 37 are formed for each pitch of one fuel storage cell 23.

Since the through holes 37 are provided corresponding to the mounting holes of the band-shaped partition plate 32, the inner diameter of the through holes 37 is set smaller than the plate thickness (side end surface width) of the band-shaped partition plate 32. A spring pin 34 is provided in the through hole 37 and the mounting hole 35.
Alternatively, the connecting bolt 36 is inserted, and the flat partition plate 31 and the strip partition plate 32 are joined.

That is, the connection between the plate-shaped partition plate 31 and the band-shaped partition plate 32 at the intermediate portion of the spent fuel storage rack 20 is performed by a spring pin 34 as shown in FIG. The connection of the first-stage and last-stage plate-shaped partition plates 31 and the band-shaped partition plates 32 at the outer peripheral portion of the rack 20 is performed by connection bolts 36 as shown in FIG.

The spring pin 34 has a larger diameter than the plurality of through holes 37 of the flat partition plate 31 and further has a band-shaped partition plate 32.
It has a larger diameter than the mounting hole 35. And spring pin 3
4 has a length protruding from the surface of the flat partition plate 31 when inserted into the through hole 37. The protruding length is inserted into the mounting holes 35 of the adjacent strip-shaped partition plates 32. The connection bolt 36 is inserted into a plurality of through holes 37 of the flat partition plate 31 and has a screw length that can be screwed into a screw hole 38 provided in the mounting hole 35 of the strip partition plate 32.

FIG. 2 is a partially cutaway sectional view taken along the line AA of FIG. 1A, and further shows the through hole 37 and the mounting hole 35 in a partially sectional view. As shown in FIG. 2, the spring pin 34 is inserted into the through hole 37 of the plate-shaped partition plate 31, and the length thereof is formed longer than the through hole 37. Then, the longer portion protrudes from the surface of the plate-shaped partition plate 31 at both ends, and is inserted into the mounting holes 35 of the band-shaped partition plate 32 on both sides.

FIG. 3 is a partially cutaway sectional view taken along line BB of FIG. 2, and FIG. 4 is a partially cutaway sectional view taken along line CC of FIG. That is, the connection between the plate-shaped partition plate 31 and the band-shaped partition plate 32 at the intermediate portion of the spent fuel storage rack 20 is performed by the through hole 37 of the plate-shaped partition plate 31 and the band-shaped partition plate 32.
This is performed by the spring force of the spring pin 34 inserted into the mounting hole 35 of FIG.

As described above, the plurality of flat partition plates 31 and the plurality of strip partition plates 32 are arranged so as to intersect at right angles with each other on the plane of the spent fuel storage rack 20, and
2 and the through hole 3 in the flat partition plate 31
7 are fixed by spring pins 34, and the first and last flat plate-shaped partition plates 31 located on the outer peripheral portion of the spent fuel storage rack 20 are fixed to the band-shaped partition plates 32 with connection bolts 36. That is, the screw hole 38 is formed in the mounting hole 35 on one side end surface of the strip-shaped partition plate 32, and the spent fuel storage rack 2
The screw holes 38 are arranged so as to face the through holes 37 in the flat plate-like partition plates 31 at both ends, and the connection connection bolts 36 are inserted into the through holes 37 so that the screw holes in the side end surfaces of the band-like partition plate 32 are formed. Screw 38 to fix. Thus, a plurality of fuel storage cells 23 arranged in parallel are formed.

That is, in manufacturing the spent fuel storage rack 20, screw holes are formed in the mounting holes 35 on the side end surfaces of the plurality of strip-shaped partition plates 32 located at both ends of the spent fuel storage rack 20. The hole 38 is disposed at a right angle to the position of the through hole 37 of the plate-shaped partition plate 31 so that the side end surface thereof abuts. Then, the side end surface of the abutting strip-shaped partition plate 32 and the plate-shaped partition plate 31 are fixed with the connection connection bolts 36, and the first-stage assembly is performed.

Next, the plate-like partition plate 31 is placed so that the through-hole 37 of the plate-like partition plate 31 of the second stage comes into the mounting hole 35 on the side end surface of the band-like partition plate 32 of the first stage. Thereafter, the spring pins 34 are inserted through the through holes 37 of the second-stage plate-shaped partition plate 31, and the intersections of the plurality of band-shaped partition plates 32 and the plate-shaped partition plate 31 are fixed.

Thereafter, using the spring pins 35, the band-shaped partition plate 32 and the plate-shaped partition plate 31 are sequentially stacked in the same procedure to manufacture the spent fuel storage rack 20. Note that the final-stage plate-like partition plate 31 is fixed to the band-like partition plate 32 with bolts, similarly to the first-stage plate-like partition plate 31.

According to the first embodiment, since only the through holes 37 and the mounting holes 35 are provided in the plate-shaped partition plate 31 and the band-shaped partition plate 32, the machining time can be reduced. In addition, since welding is not required in the assembling, the operation is simplified, and thermal deformation and residual stress due to welding are eliminated. Therefore, it is possible to provide the spent fuel storage rack 20 having improved assembling accuracy, improved strength and corrosion resistance, and having a short manufacturing period and excellent economic efficiency.

In order to reduce the pitch between the fuel storage cells 23 and make the spent fuel storage rack 20 denser, both the material of the plate-like partition plate 31 and the material of the band-like partition plate 32 are excellent in neutron absorption capacity. It is desirable to use boron-added stainless steel, which is also effective as a strength member. However, if necessary, for example, every other plate-shaped partition plate 31 or band-shaped partition plate 32 may be made of ordinary stainless steel, or separately. It is also possible to easily mix a material excellent in mechanical strength or neutron absorption ability as appropriate.

Next, a second embodiment of the present invention will be described. 5 to 7 show a second embodiment of the present invention.
In the second embodiment, the flat partition plate 31 and the band-shaped partition plate 32 are connected to each other by fitting into a groove, and the outer peripheral portion of the spent fuel storage rack 20 is surrounded by a reinforcing plate 42 and fixed. It was done. FIG. 5 is a circuit diagram of the second embodiment shown in FIG.
FIG. 6A is a sectional view taken along line AA, FIG. 6 is a sectional view taken along line DD in FIG. 5, and FIG. 7 is an external perspective view of the second embodiment of the present invention.

As shown in FIG. 6, a plurality of grooves 43 are provided on the flat partition plate 31 at substantially the same interval as the width of the fuel assembly 7, and the band-shaped partition plate 32 has a side end face of the flat partition plate 31.
And is disposed at right angles to the flat partition plate 31 in contact with the groove 43 position. In this way, after the side end surfaces of the band-shaped partition plate 32 are combined in a grid shape so as to abut the groove 43 position of the flat plate-shaped partition plate 31, the outer periphery is surrounded by the reinforcing plate 42 and fixed with the bolts 44 as shown in FIG. And integrate. The reinforcing plate 42
Are provided on the outer periphery of the spent fuel storage rack 20 at approximately three locations: upper, middle, and lower.

In the second embodiment, the spring pins 34
In addition, since the outer periphery is surrounded by the reinforcing plate 42 and fixed by the bolts 44 irrespective of the connection connection bolts 36, it is only necessary to insert the intersection of the plate-shaped partition plate 31 and the band-shaped partition plate 32.
Workability is improved.

In this case, the grooves 43 of the flat partition plate 31 need only be set slightly larger than the thickness of the strip partition plate 32, and the through hole 37 and the mounting hole 35 or the screw hole 38 are required.
Processing becomes unnecessary. Accordingly, the processing time of the band-shaped partition plate 32 can be further reduced, and the spring pin 34 and the connection bolt 36 become unnecessary, which can contribute to a reduction in the number of components and a reduction in assembly time.

[0049]

As described above, according to the present invention, the machining of the plate-like partition plate and the band-like partition plate only involves forming a hole or a groove, so that the machining time is shortened. Further, since welding is not required when assembling the plate-shaped partition plate and the band-shaped partition plate in a lattice shape, thermal deformation and residual stress due to welding are eliminated. Therefore, assembling accuracy is improved, strength and corrosion resistance are improved, and the manufacturing period can be shortened.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a spent fuel storage rack of the present invention. FIG. 1 (a) is a plan view of the spent fuel storage rack, and FIG. 1 (b) is an intermediate portion of the spent fuel storage rack in the first embodiment. Explanatory drawing of a combination of a plate-shaped partition plate and a band-shaped partition plate, FIG.
(C) is an explanatory view of the combination of the first-stage and last-stage plate-shaped partition plates and the band-shaped partition plates in the first embodiment.

FIG. 2A shows a first embodiment of the present invention.
2 is a partially cutaway sectional view taken along line AA.

FIG. 3 is a partially cutaway sectional view taken along line BB of FIG. 2;

FIG. 4 is a partially cutaway sectional view taken along line CC of FIG. 2;

FIG. 1 (a) according to a second embodiment of the present invention.
Sectional drawing in the AA line of FIG.

FIG. 6 is a partially cutaway sectional view taken along line DD of FIG. 5;

FIG. 7 is an external perspective view of a second embodiment of the present invention.

FIG. 8 is a plan view of a conventional spent fuel storage rack.

FIG. 9 is an explanatory view of a combination of a first lattice plate and a second lattice plate in a conventional example.

FIG. 10 is an enlarged vertical sectional view taken along the line G-G of FIG. 8;

FIG. 11 is a sectional view taken along the line HH in FIG. 10;

FIG. 12 is a sectional view taken along the line II of FIG. 10;

[Explanation of symbols]

 3 Base 7 Fuel Assembly 20 Spent Fuel Storage Rack 21 First Lattice Plate 22 Second Lattice Plate 23 Fuel Storage Cell 24 Projection 25 Depression 26 Slit 27 Welding Part 31 Flat Partition 32 Strip Partition 34 Spring Pin 35 Mounting hole 36 Connection bolt 37 Through hole 38 Screw hole 42 Reinforcement plate 43 Groove 44 Bolt

Claims (6)

[Claims] 1. A spent fuel storage rack in which a plurality of fuel storage cells for storing spent fuel assemblies are formed by combining partition plates in a grid pattern, at intervals substantially equal to the width of the fuel assemblies. A plate-shaped partition plate provided with a plurality of through-holes, a band-shaped partition plate disposed at a right angle to the plate-shaped partition plate and having a mounting hole on a side end surface abutting on a through-hole position of the plate-shaped partition plate; A spent fuel storage rack, comprising: a mounting member that is inserted into a through hole and a mounting hole to connect the plate-shaped partition plate and the band-shaped partition plate. 2. The spent fuel storage rack according to claim 1, wherein the mounting member is a spring pin having a diameter larger than that of the through hole and the mounting hole. 3. The flat plate, wherein the mounting member is longer than a through hole of the flat partition plate, and is inserted into a through hole of the flat partition plate, and is also inserted into a mounting hole of a side end surface of the strip partition plate. The spent fuel storage rack according to claim 1 or 2, wherein the partition plate and the band-shaped partition plate are connected to each other. 4. The mounting hole of the strip-shaped partition plate attached to the first-stage flat plate partition plate and the last-stage flat plate partition plate is a screw hole, and the mounting member is a connection bolt.
The connecting bolt is inserted from a through hole of the plate-shaped partition plate and the screw hole of the band-shaped partition plate is screwed in, so that the plate-shaped partition plate and the band-shaped partition plate are connected to each other. The spent fuel storage rack according to any one of claims 1 to 3. 5. A spent fuel storage rack in which a plurality of fuel storage cells for storing spent fuel assemblies are formed by combining partition plates in a grid pattern, at intervals substantially equal to the width of the fuel assemblies. A plate-shaped partition plate provided with a plurality of grooves, a band-shaped partition plate disposed at a right angle to the plate-shaped partition plate and having a side end surface abutting on a groove position of the plate-shaped partition plate, and a side of the band-shaped partition plate. A spent fuel storage rack, comprising: a reinforcing plate that is assembled in a grid shape so that an end surface thereof is in contact with a groove position of the plate-shaped partition plate, and is then surrounded and fixed with bolts to integrate the outer periphery. 6. A method for manufacturing a spent fuel storage rack, comprising a plurality of fuel storage cells for storing spent fuel assemblies, formed by combining partition plates in a grid pattern, wherein the width of the fuel assemblies is substantially equal to the width of the fuel assemblies. Prepare a plate-shaped partition plate having a plurality of through holes at the same interval and a band-shaped partition plate having a mounting hole on a side end surface abutting on the through-hole position of the plate-shaped partition plate, from the through hole of the plate-shaped partition plate A plurality of the band-shaped partition plates are vertically mounted on the plate-shaped partition plate through connection bolts through screw holes provided in the mounting holes of the band-shaped partition plate, and another flat plate is formed at a mounting hole position at the other end of the band-shaped partition plate. Combine the partition plates so that the through holes match each other, insert a mounting member into the through hole and the mounting hole to connect the band-shaped partition plate and the plate-shaped partition plate, and repeat this procedure to sequentially separate another band-shaped partition. Combine plate and flat partition plate And a method of manufacturing a spent fuel storage rack, wherein the flat plate-shaped partition plate at the final stage is integrated by connecting bolts.