JP7104664B2 - Storage container for radioactive materials and its manufacturing method - Google Patents

Description

The present invention relates to a storage container for radioactive substances and a method for producing the same.

A container (for example, a dry cask) for storing radioactive substances such as spent fuel is required to have sufficient cooling performance in order to suppress an excessive temperature rise of the stored radioactive substances.

The storage container for radioactive substances includes a storage container body for storing spent fuel, a member (neutron absorber) that is placed outside the storage container body and shields neutrons emitted from the spent fuel, and neutron absorption. It has an outer cylinder arranged on the outside of the material. Generally, a heat transfer member having excellent thermal conductivity is arranged between the storage container main body and the outer cylinder, and the storage container for the radioactive substance is cooled by the heat transfer member.

For example, Patent Document 1 describes a storage container for radioactive substances including a storage container main body, an outer cylinder (exterior body), and a heat transfer member (rib). In the storage container described in Patent Document 1, the storage container body, the exterior body, and the ribs are joined to each other by bolts or welding. That is, the ribs are coupled and fixed to the peripheral surface of the storage container body by bolt / nut means, and the exterior body is configured by welding a plurality of strip-shaped plate bodies together with the ribs.

Special Table 9-512334 Gazette

In the conventional storage container for radioactive substances, for example, as disclosed in Patent Document 1, the joining between the outer cylinder and the heat transfer member and the joining between the heat transfer member and the main body of the storage container are performed by welding or bolts. There is.

When these joinings are performed by welding, it is necessary to perform welding as many as the number of heat transfer members, and it is necessary to perform welding over the entire length of the heat transfer members at each welding location. Therefore, there is a problem that the amount of welding becomes enormous, the manufacturing cost is high, and the manufacturing period is long. In addition, if the outer cylinder and the heat transfer member are not sufficiently welded and the heat transfer member and the storage container body are not sufficiently welded, the radioactive material storage container can not only maintain the required cooling performance, but also can use a neutron absorber. It will not be able to retain it, nor will it be able to maintain sufficient neutron shielding function. Therefore, there is a problem that the quality of welding between the outer cylinder and the heat transfer member and the welding between the heat transfer member and the main body of the storage container must be sufficiently ensured, and the manufacturing cost is further increased.

When joining the outer cylinder and the heat transfer member and joining the heat transfer member and the main body of the storage container with bolts, there are many joints with bolts, and as with welding, the necessary cooling performance and sufficient neutron shielding In order to maintain the function, there is a problem that the manufacturing cost becomes high and the manufacturing period becomes long.

An object of the present invention is to provide a storage container for radioactive substances and a method for producing the same, which can maintain the required cooling performance and neutron shielding function, reduce the production cost, and shorten the production period.

The storage container for radioactive substances according to the present invention includes a storage container body for storing radioactive substances, a plurality of heat transfer members arranged outside the storage container body, and an outer cylinder arranged outside the heat transfer member. , A neutron absorber arranged between the storage container main body and the outer cylinder is provided. The heat transfer member is a tubular member having a hollow portion, and comes into contact with the storage container main body and the outer cylinder. The neutron absorber is arranged outside the heat transfer member and in the hollow portion of the heat transfer member.

The heat transfer member is a bent plate-shaped member, which comes into contact with the storage container body and the outer cylinder, and the neutron absorber is a space surrounded by the storage container body and the heat transfer member, and the heat transfer member. It may be arranged in a space surrounded by an outer cylinder and the heat transfer member.

The method for manufacturing a storage container for radioactive substances according to the present invention includes a first step of arranging a plurality of heat transfer members on the outside of the storage container body for storing the radioactive substance, and opening on the outside of the storage container body in the circumferential direction. By closing the portion of the outer cylinder that is open in the circumferential direction after the second step of arranging the cylindrical outer cylinder and the first step and the second step, the storage container body and the storage container body can be obtained. After the third step of pressing the outer cylinder against the heat transfer member located between the outer cylinder and applying a force from the outside to press the heat transfer member against the storage container main body, and after the third step, A fourth step of arranging the neutron absorber between the storage container main body and the outer cylinder is provided.

According to the present invention, it is possible to provide a storage container for radioactive substances and a method for producing the same, which can maintain the required cooling performance and neutron shielding function, reduce the production cost, and shorten the production period.

It is a top view of the storage container of radioactive material by Example 1 of this invention, and is the figure which shows the inside of the storage container. It is a perspective view of the storage container of radioactive material by Example 1 of this invention, and is the figure which shows the whole storage container. It is a figure which shows the heat transfer member arranged in the space between a storage container main body and an outer cylinder, and is the figure which shows the heat transfer member before being deformed by the force applied by the outer cylinder. It is a figure which shows the heat transfer member arranged in the space between a storage container main body and an outer cylinder, and is the figure which shows the heat transfer member after being deformed by the force applied by the outer cylinder. FIG. 5 is a diagram showing a process of deforming a heat transfer member by applying a force to the heat transfer member by a cylindrical outer cylinder having one open portion in the circumferential direction in a process of manufacturing a container for storing radioactive substances. FIG. 5 is a diagram showing a process of deforming a heat transfer member by applying a force to the heat transfer member by an outer cylinder having a plurality of portions open in the circumferential direction in a process of manufacturing a container for storing radioactive substances. The figure which shows the example which the square tube-shaped heat transfer member is arranged in the space between a storage container main body and an outer cylinder. The figure which shows the heat transfer member provided in the storage container of the radioactive substance by Example 2 of this invention.

The storage container for radioactive substances according to the present invention is arranged in a space between a storage container body for storing radioactive substances, an outer cylinder arranged outside the storage container body, and an outer surface of the storage container body and an inner surface of the outer cylinder. It is equipped with a heat transfer member and a neutron absorber. When manufacturing a radioactive material storage container, the heat transfer member is crushed from the outside by the outer cylinder and comes into surface contact with the storage container body and the outer cylinder, so that the contact area between the storage container body and the outer cylinder increases, and the circumference increases. Movement in the direction is suppressed.

The radioactive substance storage container according to the present invention can reduce the manufacturing cost of the storage container by significantly reducing welding and bolting between the outer cylinder and the heat transfer member and between the heat transfer member and the storage container body. The manufacturing period can be significantly shortened, and the required cooling performance and neutron shielding function can be maintained.

Hereinafter, a container for storing radioactive substances and a method for producing the same according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1A is a plan view of the radioactive material storage container 10 according to the first embodiment of the present invention, and is a view showing the inside of the storage container 10. FIG. 1B is a perspective view of the radioactive material storage container 10 according to the first embodiment of the present invention, and is a view showing the entire storage container 10. The radioactive substance storage container 10 according to the present embodiment has a cylindrical shape and stores radioactive substances such as spent fuel. FIG. 1A shows only a quarter portion of the storage container 10 in the circumferential direction.

The storage container 10 includes a storage container main body 3 for storing radioactive substances, a plurality of heat transfer members 2 and neutron absorbers 5 arranged outside the storage container main body 3, and the outside of the heat transfer member 2 and the neutron absorber 5. The outer cylinder 1 arranged in is provided. The storage container 10 has a cooling performance that releases heat generated from the stored radioactive material to the outside to remove it, and a neutron shielding function that shields the radiation emitted from the radioactive material, especially neutrons, and prevents them from leaking to the outside. Be prepared. Each of the plurality of heat transfer members 2 comes into contact with the storage container main body 3 and the outer cylinder 1.

The storage container main body 3 has a cylindrical shape, includes a space 4 for storing the radioactive material inside, and the radioactive material is arranged between the lattice plates installed in the space 4.

The plurality of heat transfer members 2 are arranged in the space between the outer surface of the storage container main body 3 and the inner surface of the outer cylinder 1, and transfer the heat generated from the radioactive substance to the outer cylinder 1. The heat transferred to the outer cylinder 1 is released to the outside and removed from the storage container 10. The heat transfer member 2 is a tubular member (for example, a tubular member) having a hollow portion, and when the outer cylinder 1 is pressed, a force is applied from the outside, and the heat transfer member 2 is pressed against the storage container body 3 to be deformed and the storage container body 3 And the outer cylinder 1 come into surface contact with each other. The heat transfer member 2 is a member having a large thermal conductivity, and can be composed of a member that is deformed when crushed by the outer cylinder 1 to increase the contact area between the storage container main body 3 and the outer cylinder 1, for example. It can be composed of metals such as copper and aluminum.

The neutron absorber 5 is made of, for example, a resin, is arranged between the outer surface of the storage container main body 3 and the inner surface of the outer cylinder 1, and shields neutrons emitted from the radioactive substance. The neutron absorber 5 is arranged between the outside of the heat transfer member 2 and the hollow portion of the heat transfer member 2 in the space between the storage container main body 3 and the outer cylinder 1.

The outer cylinder 1 is a cylindrical member that surrounds the outside of the neutron absorber 5 and the heat transfer member 2, is made of an arbitrary metal (for example, carbon steel), and has a higher rigidity than the heat transfer member 2.

2 and 3 are views showing the heat transfer member 2 arranged in the space between the storage container main body 3 and the outer cylinder 1. FIG. 2 is a diagram showing a heat transfer member 2 before being deformed by applying a force by the outer cylinder 1. FIG. 3 is a diagram showing a heat transfer member 2 after being deformed by applying a force by the outer cylinder 1.

In the manufacturing process of the radioactive substance storage container 10, a plurality of heat transfer members 2 are arranged in the space between the storage container main body 3 and the outer cylinder 1 as shown in FIG. 2, and then as shown in FIG. By applying a force inward in the radial direction to the outer cylinder 1, the heat transfer member 2 is crushed and deformed by the outer cylinder 1, and the contact area between the heat transfer member 2 and the storage container body 3 and the heat transfer member 2 and the outer cylinder are formed. Make the contact area with 1 large.

When a force from the outside to the inside (force toward the inside in the radial direction) is applied by the outer cylinder 1, the heat transfer member 2 is deformed into a shape extending in the circumferential direction, and the outer surface of the storage container body 3 and the outer cylinder 1 In surface contact with the inner surface of the above, the contact area with respect to these becomes large. When the heat transfer member 2 is deformed and extends in the circumferential direction, the friction between the storage container main body 3 and the outer cylinder 1 becomes large, and the movement in the circumferential direction is suppressed.

In the storage container 10 according to the present embodiment, the heat transfer member 2 does not have to be fixed to the storage container main body 3 and the outer cylinder 1 by welding or bolts. Further, although the heat transfer members 2 are in contact with each other, not all of them may be in contact with each other. In the storage container 10 according to the present embodiment, welding or bolting between the outer cylinder 1 and the heat transfer member 2 and between the heat transfer member 2 and the storage container main body 3 is unnecessary, and the heat transfer member It is not necessary to accurately determine the position of 2 in the circumferential direction, the manufacturing cost of the storage container 10 can be reduced, and the manufacturing period can be significantly shortened.

The outer surface of the heat transfer member 2, the outer surface of the storage container body 3, and the inner surface of the outer cylinder 1 have surface roughness so that the heat transfer member 2 can be crushed and deformed from the state of FIG. 2 to the state of FIG. When these surface roughnesses are appropriately set, the heat transfer member 2 slides and moves in the circumferential direction by fastening the fastening member 6 described later, and is naturally arranged at equal intervals in the circumferential direction.

FIG. 4 is a diagram showing a step of applying a force to the heat transfer member 2 by the outer cylinder 1 to deform the heat transfer member 2 in the manufacturing process of the radioactive material storage container 10, and is a plan view of the storage container 10. ..

The outer cylinder 1 is a cylindrical member having a portion open in the circumferential direction, and is arranged so as to surround the outside of the heat transfer member 2. The outer cylinder 1 shown in FIG. 4 is open at one location in the circumferential direction. When the portion of the outer cylinder 1 opened in the circumferential direction is fastened by the fastening member 6, a force is applied inward in the radial direction, the opened portion is closed, and a force is applied to the heat transfer member 2 inward in the radial direction. , The heat transfer member 2 is crushed from the outside to be deformed. The outer cylinder 1 is fastened by the fastening member 6 to surround the heat transfer member 2 and the storage container main body 3 without a gap in the circumferential direction. For example, bolts can be used for the fastening member 6.

When the outer cylinder 1 is fastened by the fastening member 6 and a force is applied to the outer cylinder 1 inward in the radial direction, the heat transfer member 2 is crushed and deformed from the outside by the outer cylinder 1.

A plurality of points in the length direction (direction perpendicular to the paper surface of FIG. 4) of the outer cylinder 1 are fastened by the fastening member 6. After the outer cylinder 1 is fastened by the fastening member 6, the fastening portion (the portion closed by fastening with the fastening member 6) is welded without a gap. When the fastening member 6 fastens the outer cylinder 1, the outer cylinder 1, the heat transfer member 2, and the storage container main body 3 are fixed to each other. The fastening member 6 may be removed by cutting or cutting after the fastening portion of the outer cylinder 1 is welded.

The outer cylinder 1 may be a cylindrical member having a plurality of portions open in the circumferential direction. That is, the outer cylinder 1 may be a cylindrical member composed of a plurality of arcuate plate-shaped members.

FIG. 5 is a diagram showing a step of deforming the heat transfer member 2 by applying a force to the heat transfer member 2 by the outer cylinder 1 having a plurality of portions opened in the circumferential direction in the manufacturing process of the radioactive material storage container 10. , Is a plan view of the storage container 10. The outer cylinder 1 is a cylindrical member having a plurality of portions open in the circumferential direction, and is composed of a plurality of arc-shaped plate-shaped members. FIG. 5 shows, as an example, an outer cylinder 1 having three portions open in the circumferential direction. The outer cylinder 1 is composed of three arc-shaped plate-shaped members.

In the outer cylinder 1, the joint portion between the three arc-shaped members, that is, the portion opened in the circumferential direction is fastened by the fastening member 6 and closed, so that the heat transfer member 2 and the storage container body 3 are brought together in the circumferential direction. Surround without gaps. In FIG. 5, the outer cylinder 1 is fastened at three points in the circumferential direction by the fastening member 6.

Even if the outer cylinder 1 is composed of a plurality of arcuate members, the heat transfer member 2 is outside when the outer cylinder 1 is fastened by the fastening member 6 and a force is applied to the outer cylinder 1 inward in the radial direction. It is crushed from the outside by the cylinder 1 and deformed.

Here, a method for manufacturing the radioactive material storage container 10 according to this embodiment will be described.

First, the bottom surface of the storage container 10 is installed on the cylindrical storage container main body 3.

Next, an outer cylinder 1 having a portion opened in the circumferential direction is arranged on the outside of the storage container main body 3.

Next, a plurality of heat transfer members 2 are arranged between the storage container main body 3 and the outer cylinder 1 on the outside of the storage container main body 3.

After arranging a plurality of heat transfer members 2 on the outside of the storage container main body 3, the outer cylinder 1 may be arranged on the outside of the storage container main body 3 and on the outside of the heat transfer member 2. The heat transfer member 2 may be located between the storage container main body 3 and the outer cylinder 1, and the installation order of the heat transfer member 2 and the outer cylinder 1 can be arbitrarily determined.

Next, the fastening member 6 is attached to the outer cylinder 1, and the portion of the outer cylinder 1 opened in the circumferential direction is fastened with the fastening member 6 to close the outer cylinder 1. When the outer cylinder 1 is fastened by the fastening member 6, the plurality of heat transfer members 2 are pressed against the storage container main body 3 by pressing the outer cylinder 1 and applying a force from the outside, and the storage container main body 3 and the outer cylinder 2 are pressed. It is crushed by contact with 1 and deformed so as to extend in the circumferential direction. If the heat transfer member 2 is in contact with the storage container body 3 before deformation, the area in contact with the storage container body 3 becomes large after deformation, and if it is in contact with the outer cylinder 1 before deformation, after deformation. Has a large area in contact with the outer cylinder 1. Further, when the outer cylinder 1 is fastened, the heat transfer member 2 contacts the storage container main body 3 and deforms if it is not in contact with the storage container main body 3 before the deformation, and contacts the outer cylinder 1 before the deformation. If not, it comes into contact with the outer cylinder 1 and deforms.

Next, the neutron absorber 5 (for example, a gel-like resin) is filled in the space between the storage container main body 3 and the outer cylinder 1 and arranged in the outside of the heat transfer member 2 and the hollow portion of the heat transfer member 2. do. The neutron absorber 5 solidifies after filling.

After storing the radioactive material in the space 4, the upper surface (cover) is installed on the storage container main body 3.

Even if the plurality of heat transfer members 2 are not evenly arranged in the circumferential direction, the surface roughness of the outer surface of the heat transfer member 2, the outer surface of the storage container main body 3, and the inner surface of the outer cylinder 1 can be appropriately managed. By fastening the fastening members 6, they are naturally arranged at equal intervals in the circumferential direction. When a plurality of heat transfer members 2 are arranged at equal intervals in the circumferential direction, the heat of the radioactive substance can be effectively transferred to the outer cylinder 1 and released to the outside. Further, if the storage container main body 3 is provided with a member (for example, a protrusion provided on the outer surface of the storage container main body 3) for determining the position of the heat transfer member 2 in the circumferential direction, a plurality of heat transfer members 2 are more effectively provided. Can be arranged at equal intervals with each other in the circumferential direction.

The plurality of heat transfer members 2 may be fixed to the storage container main body 3 with bolts (or welding), if necessary, in order to arrange them at equal intervals in the circumferential direction or for manufacturing reasons. When the heat transfer member 2 is fixed to the storage container body 3 with a bolt, a plurality of heat transfer members 2 are arranged on the outer surface of the storage container body 3 and fixed with bolts, and then the storage container body 3 and the heat transfer member 2 are fixed. The outer cylinder 1 is arranged around the outer cylinder 1, and then the portion of the outer cylinder 1 opened in the circumferential direction is fastened by the fastening member 6.

The heat transfer member 2 can have any shape as long as it is a tubular member having a hollow portion. 1A to 5 show an example in which the heat transfer member 2 has a cylindrical shape. The heat transfer member 2 may have the shape of a prismatic cylinder (square cylinder) such as a square pillar.

FIG. 6 is a diagram showing an example in which a square tubular heat transfer member 2 is arranged in a space between the storage container main body 3 and the outer cylinder 1. The heat transfer member 2 shown in FIG. 6 has a square tubular shape, is curved so that the surface in contact with the storage container body 3 projects inward in the radial direction, and the surface in contact with the outer cylinder 1 projects outward in the radial direction. It is curved to do.

When the heat transfer member 2 has a square cylinder shape, the area where the heat transfer member 2 comes into contact with the storage container body 3 and the outer cylinder 1 can be made larger, and the heat of the radioactive substance can be more effectively transferred to the outer cylinder 1. It can be transmitted and released to the outside.

Since the radioactive material storage container 10 according to the present embodiment can significantly reduce welding and joining with bolts, the manufacturing cost can be reduced and the manufacturing period can be shortened. Further, since the heat transfer member 2 can effectively release the heat of the radioactive substance to the outside, the required cooling performance can be maintained, and the neutron absorber 5 can maintain the neutron shielding function.

The radioactive material storage container 10 according to the second embodiment of the present invention will be described. The radioactive material storage container 10 according to the present embodiment has a different shape of the heat transfer member from the radioactive material storage container 10 according to the first embodiment. Hereinafter, the storage container 10 according to the present embodiment will be mainly described as being different from the storage container 10 according to the first embodiment.

FIG. 7 is a diagram showing a heat transfer member 12 included in the radioactive material storage container 10 according to the present embodiment. The radioactive material storage container 10 according to this embodiment includes a plurality of plate-shaped heat transfer members 12.

Each of the plurality of heat transfer members 12 comes into contact with the storage container main body 3 and the outer cylinder 1. Each heat transfer member 12 is a plate-shaped member bent at one or a plurality of points (that is, a zigzag-shaped plate-shaped member), and comes into contact with the storage container main body 3 and the outer cylinder 1 at the bent points. The plurality of plate-shaped heat transfer members 12 are fixed to the storage container main body 3 by fixing members 13 such as bolts in a state of being in contact with each other in the circumferential direction.

By the heat transfer member 12, the space between the storage container main body 3 and the outer cylinder 1 is surrounded by the space surrounded by the storage container main body 3 and the bent heat transfer member 12, and the outer cylinder 1 and the bent heat transfer member 12. There is a space.

When a force is applied from the outside by the outer cylinder 1, the heat transfer member 12 is crushed and deformed, and the area of contact between the storage container main body 3 and the outer cylinder 1 becomes large.

The neutron absorber 5 is a space between the storage container main body 3 and the outer cylinder 1, and is surrounded by the space surrounded by the storage container main body 3 and the bent heat transfer member 12 and the outer cylinder 1 and the bent heat transfer member 12. It is placed in a space.

The radioactive material storage container 10 according to the present embodiment can also be manufactured by the same manufacturing method as the radioactive material storage container 10 according to the first embodiment. However, after arranging a plurality of heat transfer members 12 on the outer surface of the storage container main body 3 and fixing them with the fixing member 13, the outer cylinder 1 is arranged around the storage container main body 3 and the heat transfer member 12, and then the outer cylinder The portion opened in the circumferential direction of 1 is fastened by the fastening member 6. The neutron absorber 5 is a space between the storage container main body 3 and the outer cylinder 1, and is surrounded by the space surrounded by the storage container main body 3 and the bent heat transfer member 12 and the outer cylinder 1 and the bent heat transfer member 12. It is filled and placed in the space.

Similar to the radioactive material storage container 10 according to the first embodiment, the radioactive material storage container 10 according to the present embodiment can significantly reduce welding and joining by bolts, so that the manufacturing cost can be reduced and the manufacturing period can be shortened. can. Further, since the heat transfer member 12 can effectively release the heat of the radioactive substance to the outside, the required cooling performance can be maintained, and the neutron absorber 5 can maintain the neutron shielding function.

The present invention is not limited to the above embodiment, and various modifications are possible. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to the embodiment including all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment. It is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to delete a part of the configurations of each embodiment and add / replace other configurations.

1 ... Outer cylinder, 2 ... Heat transfer member, 3 ... Storage container body, 4 ... Space, 5 ... Neutron absorber, 6 ... Fastening member, 10 ... Radioactive material storage container, 12 ... Heat transfer member, 13 ... Fixing member ..

Claims (7)

The main body of the storage container that stores radioactive substances,
A plurality of heat transfer members arranged on the outside of the storage container body,
An outer cylinder arranged outside the heat transfer member and
A neutron absorber arranged between the storage container body and the outer cylinder,
With
The heat transfer member is a tubular member provided with a hollow portion, and comes into contact with the storage container main body and the outer cylinder.
The neutron absorber is arranged outside the heat transfer member and in the hollow portion of the heat transfer member .
The outer cylinder is a cylindrical member, and a portion open in the circumferential direction is fastened by a fastening member, and the open portion is closed.
The heat transfer member is crushed by the outer cylinder because the outer cylinder is fastened by the fastening member.
A storage container for radioactive substances, which is characterized by this. The main body of the storage container that stores radioactive substances,
A plurality of heat transfer members arranged on the outside of the storage container body,
An outer cylinder arranged outside the heat transfer member and
A neutron absorber arranged between the storage container body and the outer cylinder,
With
The heat transfer member is a bent plate-shaped member that comes into contact with the storage container main body and the outer cylinder.
The neutron absorber is arranged in a space surrounded by the storage container main body and the heat transfer member, and in a space surrounded by the outer cylinder and the heat transfer member .
The outer cylinder is a cylindrical member, and a portion open in the circumferential direction is fastened by a fastening member, and the open portion is closed.
The heat transfer member is crushed by the outer cylinder because the outer cylinder is fastened by the fastening member.
A storage container for radioactive substances, which is characterized by this. The plurality of heat transfer members are in contact with each other.
The storage container for radioactive substances according to claim 1 or 2. The first step of arranging a plurality of heat transfer members on the outside of the storage container body for storing radioactive substances, and
The second step of arranging a cylindrical outer cylinder having a portion open in the circumferential direction on the outside of the storage container main body, and
After the first step and the second step, by fastening and closing the portion of the outer cylinder opened in the circumferential direction with a fastening member, the transmission located between the storage container main body and the outer cylinder. The third step of pressing the outer cylinder against the heat member and applying a force from the outside to press the heat transfer member against the storage container body to deform it .
After the third step, a fourth step of arranging the neutron absorber between the storage container main body and the outer cylinder, and
A method for manufacturing a storage container for radioactive substances, which comprises the above. After the third step, the plurality of heat transfer members are in contact with each other.
The method for manufacturing a storage container for radioactive substances according to claim 4. The heat transfer member is a tubular member having a hollow portion, and is a tubular member.
In the fourth step, the neutron absorber is arranged outside the heat transfer member and in the hollow portion of the heat transfer member.
The method for manufacturing a storage container for radioactive substances according to claim 4. The heat transfer member is a bent plate-shaped member.
In the fourth step, the neutron absorber is arranged in a space surrounded by the storage container main body and the heat transfer member, and in a space surrounded by the outer cylinder and the heat transfer member.
The method for manufacturing a storage container for radioactive substances according to claim 4.

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