JP7195214B2 - Spent fuel container - Google Patents

Description

The present invention relates to a spent fuel storage container.

Fuel that has been used for a period of time in the reactor core of a nuclear power plant facility is removed from the core. The extracted core is temporarily stored in a fuel pit for storing spent fuel assemblies. After that, the spent fuel assemblies that have been cooled for a predetermined period of time are finally transported to a reprocessing plant and reprocessed. Reprocessing removes uranium and plutonium from spent fuel assemblies. Uranium and plutonium are used as recycled resources.

Methods for managing and storing spent fuel assemblies on or off the premises of a nuclear power plant include dry storage methods such as metal cask storage, concrete cask storage, and vault storage, and wet storage methods such as water pools.

In consideration of storage cost, safety in the event of power loss, and long-term storage stability, a dry storage method that does not use a power source and can be cooled with air is advantageous. Among the dry storage methods, the one currently in practical use in Japan is the metal cask storage method in which spent fuel is stored in metal casks.

A metal cask is used as follows.
A grid-like basket is constructed in a cylindrical container made of metal. Then, one spent fuel assembly is inserted into each lattice. And it is a structure sealed with a double structure metal lid. The basket is constructed using a material containing neutron absorbers. It is designed to ensure sub-criticality by sufficiently absorbing the neutrons emitted from the spent fuel assemblies when the spent fuel assemblies are loaded in the basket.

The spent fuel assembly generates decay heat, and the internal heat is transferred to the surface of the metal cask via the basket. Heat is released from the surface of the metal cask by radiation to the surroundings and cooling by natural convection of air. In addition, the metal cask has sufficient structural strength so as not to be damaged by a high impact load received in the unlikely event of dropping during transportation.

When the spent fuel assemblies are loaded into the cask, they are underwater to shield against radiation. Fuel assemblies used in pressurized water reactors (PWR) are wider than fuel assemblies in boiling water reactors (BWR). As such, pressurized water reactor (PWR) spent fuel assemblies loaded in baskets underwater can become critical if they come too close together. Therefore, the spent fuel assemblies of a pressurized water reactor (PWR) need to be arranged with a greater distance between adjacent fuel assemblies than the spent fuel assemblies of a boiling water reactor (BWR). be. Hereinafter, this interval will be referred to as water gap.

There are roughly two types of baskets for storing spent fuel assemblies of pressurized water reactors (PWR).
One is to construct a basket by a plurality of spaced square pipes into which spent fuel assemblies are placed, as disclosed in Patent Document 1, for example.

Another method is to construct a basket by inserting hollow basket plates having slits orthogonally, as disclosed in FIG. 2 of Patent Document 2. In the latter case, since the basket is manufactured by stacking the basket plates in order, it is easy to manufacture the basket with high interval accuracy.

As a basket structure, those disclosed in Patent Documents 3 and 4 are also known.
In the basket structure of Patent Document 3, hollow basket plates (FIGS. 3 and 5) are used by combining parts, and slits formed in the plates form a grid-like basket (FIG. 6).

In the basket structure of Patent Document 4, a basket plate in which two plates are connected in an H shape is processed with slits for combining (Fig. 4), and a grid-like basket (Figs. 1 and 2) is manufactured. ing.

Japanese Unexamined Patent Application Publication No. 2001-108788 (Figs. 1, 3, 4) Japanese Patent Application Laid-Open No. 2006-200939 (Fig. 2) Patent No. 5894877 (Figs. 3, 5 and 6) Japanese Patent Application Laid-Open No. 2004-271254 (Figs. 1, 2, 4)

By the way, in Patent Document 1, when the spent fuel assembly of a pressurized water reactor (PWR), which is heavier and wider than the spent fuel assembly of a boiling water reactor (BWR), is targeted, a heavier load The basket plate must be made thicker to support the basket and provide sufficient strength to the basket. Therefore, there is a problem that the weight of the spent fuel storage container increases.

In Patent Document 2, a hollow portion of the basket plate acts as a water gap. Since this hollow portion is open in a direction orthogonal to the axial direction of the container (Figs. 5 and 6), when discharging water after loading the spent fuel assembly into the basket in the fuel pit, It may take time to drain the water.

In Patent Documents 3 and 4, a hollow portion provided as a water gap opens in a direction perpendicular to the axial direction of the container. Therefore, it may take time to drain the water after the spent fuel assemblies are loaded into the basket in the fuel pit.

Moreover, in Patent Documents 3 and 4, a member connecting between two opposing basket plates is molded or connected, and there is a problem that the number of man-hours for processing the basket plate increases.
SUMMARY OF THE INVENTION An object of the present invention is to provide an economical spent fuel storage container in which a basket can be easily manufactured, a water gap can be formed economically, and the weight of the storage container body is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a spent fuel storage container that is easy to manufacture and has a low weight.

In order to solve the above problems, the spent fuel storage container of the present invention includes a storage container body, and a plurality of compartments provided in the storage container body for storing spent fuel assemblies one by one. a basket, wherein the basket is constructed by assembling a plurality of basket plates in a grid pattern, and the basket plates are arranged facing each other to form a water gap opening in the axial direction of the storage container body. It consists of a pair of plates that
A notch is formed across a plurality of the basket plates installed in parallel and penetrates in a direction perpendicular to the axis of the storage container body . The notch is formed in the basket plate between a pair of the slits .

According to the present invention, it is possible to provide a spent fuel storage container that is easy to manufacture and has a low weight.

1 is a partially cutaway perspective view of a schematic structure of a spent fuel storage container according to a first embodiment of the present invention; FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view of a spent fuel storage container according to a first embodiment as viewed from above; FIG. 4 is an enlarged perspective view showing a portion of the basket configuration; FIG. 4 is an enlarged perspective view of a portion of the basket arrangement; FIG. 11 is an enlarged perspective view showing a part of the configuration of the basket before assembly according to the second embodiment; FIG. 11 is an enlarged perspective view showing a part of the configuration of the basket before assembly according to the second embodiment; FIG. 11 is an enlarged perspective view showing a part of the configuration of the assembled basket according to the second embodiment; FIG. 12 is an enlarged perspective view of a part of the configuration of the basket according to the third embodiment; FIG. 11 is an enlarged perspective view of part of a reinforcing member according to the fourth embodiment; FIG. 11 is a partially enlarged perspective view of the configuration of a basket according to a fifth embodiment; FIG. 11 is a schematic cross-sectional view of a spent fuel storage container according to a sixth embodiment as seen from above.

The present invention relates to a spent fuel storage container used for transportation and storage of spent fuel assemblies generated from nuclear power plants.
In particular, the present invention relates to a spent fuel storage container suitable for use in transporting and storing spent fuel of a pressurized water reactor (PWR).

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a spent fuel storage container according to the present invention will be described below with reference to the drawings. In each embodiment, the same parts are denoted by the same reference numerals, and overlapping descriptions are omitted. In each of the following embodiments, the case where the fuel assemblies stored in the spent fuel storage container of the present invention are used as spent fuel assemblies of a pressurized water reactor (PWR) will be described. Note that hatching indicating a cross section is omitted in some drawings.

<<First Embodiment>>
FIG. 1 shows a partially cutaway perspective view of a schematic structure of a spent fuel storage container 1 according to a first embodiment of the present invention.
The overall configuration of the spent fuel storage container 1 of the first embodiment will be described.

A spent fuel storage container (cask) 1 is used for storing or transporting the spent fuel assembly 100 .
The spent fuel storage container 1 has a basket 12 inside a cylindrical storage container main body (inner cylinder) 10 .

The basket 12 is provided with a plurality of compartments 11 for loading the spent fuel assemblies 100 . The compartment 11 is a vertically long space in which the vertically long spent fuel assembly 100 having a rectangular cross section is loaded.

The storage container body 10 covering the spent fuel assemblies 100 placed in the basket 12 has the function of shielding γ rays emitted from the spent fuel assemblies 100 . The storage container main body 10 is, for example, a cylindrical container made of alloy steel. An outer cylinder 13 is arranged on the outer periphery of the side surface of the storage container main body 10 . The storage container main body 10 and the outer cylinder 13 are connected by heat transfer fins 14 that also serve as a heat transfer path.

A space surrounded by the container body 10, the outer cylinder 13, and the heat transfer fins 14 is filled with a neutron shielding material 15. As shown in FIG. In the first embodiment, resin is used as the neutron shielding material 15 . Neutrons generated from the spent fuel assembly 100 are shielded by the neutron shielding material 15 . The neutron shielding material 15 is made of, for example, a resin containing boron, which has a high neutron absorption capability.

The upper opening of the storage container body 10 is closed with a primary lid 16, a secondary lid 17 and a tertiary lid 18 that directly face the spent fuel assembly 100 from the inside. Each lid (16, 17, 18) is attached by fastening bolts (not shown).

<Basket 12>
Next, the basket 12 will be explained.
FIG. 2 shows a schematic cross-sectional view of the spent fuel storage container 1 according to the first embodiment as viewed from above. FIG. 3 shows an enlarged perspective view showing part of the configuration of the basket 12. As shown in FIG.
As shown in FIGS. 2 and 3, the basket 12 is formed by assembling a plurality of plate-like basket plates 200 orthogonally to each other in a grid pattern to form a plurality of compartments 11 for storing the spent fuel assemblies 100 one by one. forming

As shown in FIG. 2, each partition 11 has a rectangular tubular opening 11a when viewed from above. The opening 11a has a size that allows the spent fuel assembly 100 to be accommodated therein.
The basket plate 200 is composed of a pair of plates 200a and 200b. The pair of plates 200a and 200b are flat metal plates. The plates 200a and 200b are opposed to each other with a water gap 201 opening in the axial direction of the container body 10 being formed. The water gap 201 is located between adjacent spent fuel assemblies 100 and ensures the sub-criticality of the spent fuel assemblies 100 .

As shown in FIG. 2, the storage container main body 10 has grooves 204 extending in the vertical axis direction (the front and rear directions of the paper surface of FIG. 2) in the inner wall 10n. By inserting the end portion 200 t of the basket plate 200 into the groove 204 , it is possible to prevent the entire basket 12 from rotating within the storage container main body 10 .
As a material for the basket plate 200, a material having high strength and/or high thermal conductivity is preferable.

In this embodiment, the basket plate 200 is made of a carbon steel plate, but it may have a two-layer structure in which plates made of a material having a high thermal conductivity such as a boron-containing aluminum alloy are bonded together. Also, the adjacent plates 200a and 200b may be made of different materials. For example, a plate 200a made of boron-containing stainless steel and a plate 200b made of an aluminum alloy with high thermal conductivity may be arranged side by side. It is also possible to arrange a plate 200a made of carbon steel and a plate 200b made of an aluminum alloy or a boron-containing aluminum alloy side by side.

Moreover, although the plate thicknesses of the basket plates 200 shown in FIG. 2 are set to be the same within the range of dimensional tolerance, the plate thicknesses of the plates 200a and 200b may be different.

A pair of plates 200c and 200d, which is the basket plate 200 shown in FIG. 3, is similar to the pair of plates 200a and 200b described above.
Slits 301 and 302 for assembly are formed at predetermined positions in the upper and lower portions of the basket plate 200 (200a, 200b, 200c or 200d), respectively. The slits 301 and 302 have an elongated shape extending vertically.

The slits 301 and 302 extend vertically and are formed at predetermined intervals. The slits 301 and 302 extend in the direction of the axis c0 (see FIG. 1) of the storage container body 10, and as shown in FIG. doing.

When creating the basket 12 (see FIG. 2), as shown in FIG. 3, the slits 301 and 302 of the basket plate 200 and the slits 302 and 301 of the basket plate 200 are aligned vertically. and insert it perpendicular to the As a result, the basket plates 200 are fitted together vertically (in the direction of the axis c0 of the container body 10 (see FIG. 1)).

FIG. 4 shows an enlarged perspective view of a portion of the basket 12 configuration.
The ends 200t of the basket plates 200 are placed in the grooves 204 of the container body 10 from above, and as shown in FIG. See Fig. 2). As a result, the water gap 201 (see FIG. 2) can be formed with the basket plate 200 made of plate material.

As shown in FIG. 3, the basket plate 200 is formed with a notch 303a whose upper end is recessed and a notch 303b whose lower end is recessed.
The weight of the basket plate 200 can be reduced by forming the spaces of the cuts 303a and 303b.

In addition, the cut 303a can increase the volume of water present in the water gap 201 by the space of the cut 303a. Similarly, notch 303b allows the volume of water present in water gap 201 to be increased by the space of notch 303b. Therefore, the subcriticality of the fuel assembly 100 can be improved.

When the spent fuel storage container 1 becomes horizontal, the weight of the horizontal plates 200c, 200d and the fuel assembly 100 is transmitted to the basket plate 200 through the slits 301 (see FIG. 3), and the basket plate 200. At this time, even if a portion of basket plate 200 between opposing slits 301 in basket plate 200 is cut out like cuts 303a and 303b, the weight load is transmitted to basket plate 200 by the remaining portions. Therefore, the weight of the basket plate 200 can be reduced without causing a strength problem. FIG. 4 shows a state in which the basket plate 200 shown in FIG. 3 and the plates 200c and 200d are fitted together.

3 and 4, when a cut is formed between the pair of slits 301, compared to forming a through-hole cut in the center of the basket plate 200, It has the advantage of being easy to process. In other words, the cuts 303a and 303b can be produced simultaneously with the processing of the slit 301. FIG. Therefore, there is a feature that the processing time and processing cost can be reduced compared to forming the cuts at other positions.
Moreover, since the water gap 201 is open in the direction of the axis c0 of the storage container body 10 (see FIG. 1), the water discharge property after the spent fuel assembly 100 is loaded into the basket 12 in the fuel pit is excellent. .
Further, when the spent fuel storage container 1 is stored upright as shown in FIG. It's open. Therefore, the effect of natural convection of gas inside the storage container body 10 can be utilized, and an improvement in heat removal performance can be expected.

As described above, the basket 12 can be easily manufactured, the water gap 201 (see FIG. 2) can be formed economically, and the weight of the structure covered by the storage container main body 10 can be reduced. can provide

<<Second Embodiment>>
A second embodiment of the present invention will be described with reference to FIGS. 5, 6 and 7. FIG.
FIG. 5 shows an enlarged perspective view showing a part of the configuration of the basket 12 before assembly according to the second embodiment.
When the spent fuel storage container 1 falls horizontally and receives an impact force, the load derived from the mass of the fuel assembly 100 is received by the horizontal basket plate 200, for example, the basket plate 200c in FIG. At this time, the basket plate 200c receives bending stress. At this time, by arranging the reinforcing member 401 perpendicular to the direction of the axis c0 of the container body 10 between the water gaps 201 formed by the basket plate 200c and the opposing basket plate 200d, the bending stress is reduced by the basket plate 200c. , the reinforcing member 401 and the basket plate 200d. As a result, even if the thickness of the basket plate 200c is reduced, it can bear a horizontal load. Therefore, it is possible to reduce the weight of the basket plate. The reinforcing member 401 and the basket plate 200 can be fixed by screws, for example, but other methods may be used.
Next, a simple method for arranging the reinforcing member 401 perpendicularly to the direction of the axis c0 of the container body 10 will be described.
FIG. 6 shows an enlarged perspective view showing part of the configuration of the basket 12 before assembly according to the second embodiment, and FIG. 7 shows part of the configuration of the basket after assembly according to the second embodiment of the present invention. Fig. 3 shows an enlarged perspective view showing the;
The basket plate 200 of the second embodiment is formed with an upper notch 303a and a lower notch 303b. The notch 303a and the notch 303b are formed through all the basket plates 200 arranged parallel to each other in the vertical direction of the axis c0 (see FIG. 1) of the container body 10. As shown in FIG. Therefore, as shown in FIG. 7, it is possible to install the reinforcing member 401 through the upper cut 303a and the lower cut 303b.

In the case of FIG. 6, the reinforcing member 401 is installed in the notch 303a formed on the upper side of the basket plate 200. As shown in FIG. Also, the reinforcing member 401 is installed in the water gap 201 formed by the plate 200c and the plate 200d that are vertically combined with the basket plate 200. As shown in FIG. FIG. 7 shows the result of assembling the basket plates 200 shown in FIG. 6 in a grid pattern. Reinforcing member 401 is sandwiched between notch 303a formed in the upper portion of basket plate 200 and notch 303b formed in the lower portion of plate 200e assembled to the upper portion of basket plate 200, thereby restraining vertical movement. be.

Thus, the reinforcing member 401 is arranged perpendicular to the axis c0 (see FIG. 1) of the container body 10. As shown in FIG. When the spent fuel storage container 1 falls in a horizontal position and receives an impact force, the load derived from the mass of the fuel assembly 100 is applied to the horizontal basket plate 200, for example, the plate 200c or the plate 200d in FIG. and a bending stress is generated in the basket plate 200 .

The basket plate 200 is required not to be destroyed by this bending stress, but by installing the reinforcing member 401, the bending stress can be borne by the reinforcing member 401 as well. Moreover, through the reinforcing member 401, the basket plate 200 installed opposite to the basket plate 200 (for example, the plate 200d against the plate 200c) can bear the bending stress.

Since the basket plate 200 is assembled through the slits 301, the portion having the slits 302 has the disadvantage that it cannot bear the above bending stress. Increasing the thickness of the basket plate 200 to compensate for this drawback in order to maintain strength leads to an increase in the weight of the spent fuel storage container 1, which is disadvantageous in terms of transportation.

On the other hand, by installing the reinforcing member 401 of the second embodiment, the overall thickness of the basket plate 200 may be reduced, and the total weight of the spent fuel storage container 1 may be reduced.
For this reason, the capacity of the crane for transporting the spent fuel storage container 1 has a margin. Due to this weight reduction, it becomes possible to design parts that improve performances other than strength, such as shielding and heat transfer performances.

<Assembly Order of Basket 12>
The assembling order of the basket 12 will be described with reference to FIG.
First, the basket plate 200 is inserted into the spent fuel container 1 and fixed. For fixing, grooves 204 (see FIG. 2) are formed in the vertical direction on the inner surface 10n (see FIG. 1) of the container body 10, and the longitudinal ends 200t of the basket plate 200 are fitted into the grooves 204. A method of fixing is mentioned, but other methods may be used.

The longitudinal ends 200t of the basket plate 200 are fitted into the vertical grooves 204 provided in the inner surface 10n (see FIG. 1) of the container body 10, so that the assembly is easy.
Next, the plate 200c and the plate 200d are inserted into the slits 301 of the basket plate 200 respectively, and fitted with the basket plate 200 via the slits 301 to be fixed.

After that, the reinforcing member 401 is inserted into the water gap 201 between the plate 200c and the plate 200d. Since there is a notch 303a in the upper part of the basket 200, it becomes possible to insert the reinforcing member 401 from above.
After that, the slits 302 of the plate 200e are inserted into the slits 301 of the plates 200c and 200d, and the plate 200e is fitted to the plates 200c and 200d.

Since there is a notch 303b (see FIG. 7) on the lower side of the plate 200e, it is possible to incorporate the reinforcing member 401 between the basket plates 200 from the upper side of the basket plate 200 without any problem. By forming the cuts 303a and the cuts 303b for inserting the reinforcing member 401 in the upper and lower portions of the basket plate 200 in this way, it is possible to easily assemble without processing during assembly.

Further, at the top inside the container body 10, the upper edge of the basket plate 200 is in contact with the inner surface of the primary lid 16 (see FIG. 1). Plates 200c and 200d fitted to basket plate 200 via slit 301 are composed of only the lower half of other basket plate 200. As shown in FIG.

In such a case, reinforcing member 401 is fixed by notch 303 a in the upper portion of basket plate 200 and the inner surface of primary lid 16 . Also, the height dimension of the reinforcing member 401 is set to match the shape of the notch 303a. In addition, it is easy to adjust the dimensions of the reinforcing member 401 and the notch 303a at the design stage so as to secure the dimensions that can maintain the strength as necessary.

Similarly, the bottom edge of the basket plate 200 is in contact with the inner surface of the storage container body 10 at the bottom inside the storage container body 10 . Plates 200c and 200d fitted to basket plate 200 through slits 301 are composed only of upper halves of other basket plates 200. As shown in FIG.

In such a case, the reinforcing member 401 is fixed by the notch 303b at the bottom of the basket plate 200 and the inner surface of the container body 10. As shown in FIG. Also, the height dimension of the reinforcing member 401 is set to match the shape of the notch 303b. In addition, it is easy to adjust the dimensions of the reinforcing member 401 and the notch 303b at the design stage so as to secure the dimensions that can maintain the strength as necessary.

In this manner, a plurality of reinforcing members 401 extending in the longitudinal direction of basket plate 200 are arranged side by side in the direction of axis c0 of storage container main body 10, thereby improving the strength of basket 12 as a whole.
If reinforcing members 401 are provided at the top and bottom inside the storage container body 10, the top and bottom of the basket 12 can be reinforced.

Here, the reinforcing member 401 may be provided at either the top or the bottom inside the storage container main body 10 .

<<Third Embodiment>>
FIG. 8 shows an enlarged perspective view of part of the configuration of the basket 200 according to the third embodiment.
A third embodiment will be described with reference to FIG.
FIG. 8 shows a state in which the basket plates 200 (200c, 200d, 200e) of the second embodiment are assembled in a confectionery-folded manner.

At this time, the reinforcing members 401 inserted into the cuts 303a and 303b may be plural in the direction of the axis c0 (see FIG. 1) of the spent fuel storage container 1, like the reinforcing members 401a and 401b shown in FIG. good. The reinforcing members 401a and 401b each have an H-shaped cross section and extend in a direction perpendicular to the axis c0 of the spent fuel storage container 1. As shown in FIG.

In order for the reinforcement members 401a and 401b to bear the required strength, the required cross-sectional dimensions are determined by the load, but the reinforcement members 401a and 401b need not be integrated to meet the required dimensions. As in the second embodiment, during assembly, the reinforcing members 401a and 401b are inserted from the top of the spent fuel storage container 1 between the basket plate 200c and the basket plate 200d, and finally the basket plate 200e is assembled. , simple assembly is possible.

<<Fourth Embodiment>>
FIG. 9 shows an enlarged perspective view of part of the reinforcing member 401 according to the fourth embodiment.

A fourth embodiment will be described with reference to FIG.
4th Embodiment has shown the cross-sectional shape of the reinforcement member 401 shown in 2nd Embodiment and 3rd Embodiment. When the spent fuel storage container 1 is dropped in a horizontal posture, the reinforcement member 401 is subjected to bending stress due to the weight of the spent fuel assembly 100 and the basket plate 200 . In the fourth embodiment, the cross section of the reinforcing member 401 is H-shaped, the web portion 403 of the H section is arranged at the neutral axis of bending, and the flanges 402a and 402b are arranged at positions where the bending stress is high.

The cross-sectional shape of the reinforcing member 401 may be any shape that can withstand the expected bending stress, so the shape need not be limited in terms of strength.
However, by making the cross section as shown in FIG. 9, the mass of the member can be concentrated at the position where the bending stress is applied. This means that the strength-mass ratio of the entire spent fuel storage container 1 is improved.

In addition, the advantage of the reinforcing member 401 having an H-shaped cross section is that when the reinforcing member is manufactured by shaving from a rectangular cross-sectional member, it can be processed by applying a processing jig to the side surface of the member, so other cross-sectional shapes, such as Machining is easier than with a hollow cross section, and processing costs can be reduced.

<<Fifth Embodiment>>
FIG. 10 shows a partially enlarged perspective view of the configuration of the reinforcing member 401 according to the fifth embodiment.
A fifth embodiment will be described with reference to FIG.
5th Embodiment forms the through-hole 404 in the web part 403 of the reinforcement member 401. As shown in FIG.

When the spent fuel storage container 1 is loaded with the spent fuel assemblies (fuel rods) 100, it is carried out in a fuel storage pool filled with cooling water. At that time, it is necessary to drain the water inside the storage container main body 10 .

The through hole 404 of the fifth embodiment penetrates the web portion 403 in the direction of the axis c0 of the storage container body 10 . Therefore, compared with the case without the through holes 404, the drainage time from the container body 10 can be shortened.
Further, when the cross section of the reinforcing member 401 as shown in FIG. 9 is H-shaped, the center of the web portion 403 is a position where the bending stress received when the storage container is horizontally dropped is low, and the strength characteristics of the reinforcing member 401 are significantly lost. There is no such thing. Therefore, by providing the through-holes in the web portion 403, the strength characteristics can be improved more than by providing the through-holes 404 at other positions.

<<Sixth Embodiment>>
FIG. 11 shows a schematic cross-sectional view of the spent fuel storage container 1 according to the sixth embodiment as viewed from above.
A sixth embodiment will be described with reference to FIG.
6th Embodiment shows the state which the reinforcement member 401 was incorporated in the basket plate 200. FIG.

Here, the end portion 401t of the reinforcing member 401 is processed into a shape along the inner surface 10n of the storage container main body 10. As shown in FIG. As a result, it is possible to suppress the reinforcing member 401 from moving in its own axial direction (longitudinal direction of the reinforcing member 401).

In addition, the outermost basket plate 205 is required for strength because only the basket plate 205 bears the load of the fuel assembly 100 when the spent fuel storage container 1 is dropped in a horizontal position with the basket plate 205 positioned downward. It is desirable to have a plate thickness of

<<other embodiments>>
1. Although various configurations have been described in the above embodiments, at least some of them may be adopted. For example, the configurations described may be configured by appropriately combining them.

2. The configuration described in the above embodiment is an example of the present invention, and various other configurations are possible within the scope of the claims.

1 spent fuel storage container 10 storage container main body 10n inner wall surface (inner peripheral surface)
11 Compartment 12 Basket 16 Primary lid 100 Spent fuel assembly 200 Basket plate 200a, 200b, 200c, 200d, 200e Plate 201 Water gap 204 Grooves in storage container body 301, 302 Slit in basket plate 303a Notch in basket plate (upper side notch)
303b basket plate notch (lower notch)
401 Reinforcing member 401a Protruding portion of positioning plate 401t End of reinforcing member 402 Flange portion of reinforcing member 403 Web portion of reinforcing member 404 Through hole of reinforcing member c0 Axis

Claims (5)

a storage container body;
a basket provided in the storage container main body and provided with a plurality of compartments for storing the spent fuel assemblies one by one;
The basket is constructed by assembling a plurality of basket plates in a lattice,
The basket plate is composed of a pair of plates facing each other to form a water gap opening in the axial direction of the storage container body,
a notch passing through in a direction perpendicular to the axis of the storage container body across a plurality of the basket plates installed in parallel ,
The basket plates have slits for assembling in a grid pattern by inserting the basket plates perpendicular to each other,
The notch is formed in the basket plate between the pair of slits.
A spent fuel storage container characterized by: a storage container body;
a basket provided in the storage container main body and provided with a plurality of compartments for storing the spent fuel assemblies one by one;
The basket is constructed by assembling a plurality of basket plates in a lattice,
The basket plate is composed of a pair of plates facing each other to form a water gap opening in the axial direction of the storage container body,
a notch passing through in a direction perpendicular to the axis of the storage container body across a plurality of the basket plates installed in parallel,
A spent fuel storage container, wherein a reinforcing member extending in the longitudinal direction of the basket plate is arranged through the notch. a storage container body;
a basket provided in the storage container main body and provided with a plurality of compartments for storing the spent fuel assemblies one by one;
The basket is constructed by assembling a plurality of basket plates in a lattice,
The basket plate is composed of a pair of plates facing each other to form a water gap opening in the axial direction of the storage container body,
a notch passing through in a direction perpendicular to the axis of the storage container body across a plurality of the basket plates installed in parallel,
At the top of the container body, a reinforcing member is fixed between the notch on the upper side of the basket plate and the upper inner surface of the container body; or
At least one of a reinforcing member is fixed between the notch on the lower side of the basket plate and a lower inner surface of the storage container body at the lowest part of the storage container body. used fuel container. a storage container body;
a basket provided in the storage container main body and provided with a plurality of compartments for storing the spent fuel assemblies one by one;
The basket is constructed by assembling a plurality of basket plates in a lattice,
The basket plate is composed of a pair of plates facing each other to form a water gap opening in the axial direction of the storage container body,
a notch passing through in a direction perpendicular to the axis of the storage container body across a plurality of the basket plates installed in parallel,
a reinforcing member extending longitudinally of the basket plate is positioned through the notch in the basket plate;
The reinforcing member has an H-shaped cross section and has a web portion and flange portions provided at both ends of the web portion,
A spent fuel storage container, wherein the flange portion receives a bending stress generated in the reinforcing member when the spent fuel storage container is dropped in a horizontal position. a storage container body;
a basket provided in the storage container main body and provided with a plurality of compartments for storing the spent fuel assemblies one by one;
The basket is constructed by assembling a plurality of basket plates in a lattice,
The basket plate is composed of a pair of plates facing each other to form a water gap opening in the axial direction of the storage container body,
a notch passing through in a direction perpendicular to the axis of the storage container body across a plurality of the basket plates installed in parallel,
a reinforcing member extending longitudinally of the basket plate is positioned through the notch in the basket plate;
A spent fuel storage container, wherein an end portion of the reinforcing member is processed into a shape along the inner peripheral surface of the storage container main body.

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