JP2001074877A - Radioactive substance storage equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely retain a container for storing a radioactive material even when an earthquake or the like occurs by providing a plurality of support members at intervals in the circumference direction at the outer-periphery part of the bottom part of the large container for fixing onto a floor surface. SOLUTION: A large container 1 is allowed to pass through a hole 3a for holding the large container 1 formed on a middle floor 3 by using a crane or the like from the upper part of the floor 3. Then, the large container 1 is installed so that the bottom surface of the large container 1 is brought into contact with the floor. The lower part of the large container 1 is supported onto a floor 2 by support members 4 and 41. The support members 4 and 41 are fixed onto the floor 2 by a connecting member 5 such as a bolt. In this manner, a load only in a horizontal direction is operated on the support members, thus preventing a bending moment from being acting on the bolt 5 even when an earthquake occurs, and the use of small bolt 5 is made possible. The large container 1 is fixed onto the floor 3, and the support members are arranged so that the support members come into contact with or approach the large container, and are fixed onto the floor 2. Stress applied to the large container 1 is reduced, thus the large container can be reliably stored at radioactive material storage equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radioactive substance storage facility, and more particularly to a radioactive substance storage facility for storing a plurality of containers containing radioactive substances.

[0002]

2. Description of the Related Art In order to store fuel used in a nuclear power plant until it is reprocessed, a radioactive material storage facility is provided for storing and storing a plurality of containers containing a plurality of fuels in a building. . As this container, a single container or multiple containers are used. In an example using multiple containers, a plurality of small containers are stored inside a large container. A plurality of cylindrical small containers with a bottom and a lid are stacked in the axial direction in a large cylindrical container with a bottom and a lid.

[0003] Specifically, the large container is supported on the intermediate floor at the upper part, suspended from a hole provided on the intermediate floor, and held at the lower part on the floor. Small containers are stacked in the large container in multiple stages, and the small containers are put in and taken out with the lid of the large container removed. The large container housed in the building and placed on the floor is provided with a means for preventing falling in order to prevent the container from overturning due to an earthquake or the like or to reduce the distance between adjacent containers. As a means for preventing the overturning, one that connects the large container and the intermediate floor or one that is supported inside the hole of the large container and the intermediate floor is often used. With this fall prevention means,
Although the overturn of the large container can be prevented, when the large container slides on the floor, the interval between the adjacent large containers becomes narrow. Further, since the weight of the entire large container acts on the intermediate floor, it is necessary to make the thickness of the intermediate floor sufficiently large to support the weight so that the intermediate floor is not damaged. Therefore, it is desirable to prevent the large container and the floor from slipping. This example is disclosed in JP-A-62-133390 and JP-A-11-8408.
No. 9 is described.

[0004]

In the radioactive material storage facility described in the above prior art, in order to install a large container, the large container is suspended through a hole in the intermediate floor using a crane or the like. In this case, if a large container is provided with a flange in order to fix the large container to the floor, after forming a hole larger than the flange and passing through the large container, the hole is additionally processed according to the large container, or After passing through the hole, the flange must be attached to the bottom of the large container by welding or the like, which causes a problem in workability.

In the conventional example in which the large container is fixed to the floor with a flange, when an inertial force acts on the large container due to an earthquake or the like, a horizontal load and a load due to a bending moment act on the flange bolt. For this reason, it is necessary to increase the number of bolts or increase the strength of the bolts as compared with the case where only a horizontal load acts. Increasing the number of bolts complicates the work of mounting the large container, and increasing the bolt strength increases the cost.

[0006] Further, in the apparatus described in Japanese Patent Application Laid-Open No. 62-133390, a lower cap is arranged at the lower part of a large container,
It is necessary to accurately position the large container in the lower cap, and it takes time for crane work and the like. Also, Japanese Patent Application Laid-Open
The device described in Japanese Patent Application Publication No. 1-84089 can keep the interval between adjacent containers at a predetermined value, but may cause slippage between the large container and the floor.

The present invention has been made in view of the above-mentioned disadvantages of the related art, and has as its object to store a plurality of large containers containing radioactive materials in a radioactive material storage facility with high reliability. Another object of the present invention is to reliably hold a container containing a radioactive substance even when an earthquake or the like occurs.

[0008]

Means for Solving the Problems In order to achieve the above object, a first feature of the present invention is a radioactive material storage facility for storing a plurality of large containers for storing radioactive materials using an intermediate floor. A plurality of support members are arranged at intervals in the circumferential direction on the outer periphery of the bottom of the container, and the support members are fixed to the floor surface.

[0009] Preferably, at least one of a heat insulating material and a cushioning material is disposed between the large container and the floor surface; the supporting member is a plurality of rod-shaped members; the supporting member sandwiches the large container on one surface. A plurality of plate members having a depression and the other surface being a flat plate; the support member has a shape in which an arc-shaped notch is provided at each vertex of a triangle.

A second feature of the present invention for achieving the above object is that in a radioactive material storage facility for storing a plurality of large containers for storing radioactive materials by using an intermediate floor, an outer periphery of a bottom portion of the large container is provided. A support member is disposed, and the support member is discontinuous in a circumferential direction of the large container.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of one embodiment of a radioactive substance storage facility according to the present invention, and FIG. 2 is a detailed view showing a part of FIG. 1 in section. In the radioactive material storage facility, a plurality of small containers each containing a radioactive material (not shown) are stacked in a multi-stage manner inside the large container 1. Each small container is put in and taken out of the large container 1 with the lid 11 of the large container 1 removed. The large container 1 is passed from above the intermediate floor 3 to a hole 3a for holding the large container 1 formed in the intermediate floor 3 by using a crane or the like. And the large container 3 is installed so that the bottom surface may contact the floor 2. The lower portion of the large container 1 is supported on the floor 2 by support members 4 and 41 described in detail below. The support members 4 and 41 are fixed to the floor 2 by connecting members 5 such as bolts.

The detailed structure and arrangement of the support member will be described with reference to FIGS. 3 to 9, FIG. 13 and FIG.
These figures are views for clearly showing the shape and arrangement of the support member, and correspond to the view taken along the line AA in FIG. FIG.
In the supporting member, the left side 42a of the large container 1 has an arc shape on the inner diameter side, and the right side 42b combines three straight lines on the inner diameter side. Since the left support member 42a has good adhesion to the large container 1, only one bolt 5 is required for the floor 2
It is fixed to. On the other hand, the right support member 42b is fixed to the floor 2 with two bolts. These two support members 4
The reference numerals 2a and 42b are arranged in contact with or substantially in contact with the outer peripheral portion of the large container 1, and are arranged at intervals in the circumferential direction.

According to this embodiment, only a horizontal load acts on the support members 42a and 42b, so that no bending moment acts on the bolt 5 even during an earthquake, and a small bolt is applied. 5 becomes available. Also,
Since there is no need to dispose a flange near the bottom surface of the large container 1, the diameter of the hole formed in the intermediate floor 3 shown in FIG. As a result, the work of fixing the large container 1 to the intermediate floor 3 becomes easy.
Further, after fixing the large container 1 to the intermediate floor 3, the support member may be arranged so as to be in contact with or close to the large container 1, and then the support member may be fixed to the floor 2. Can be easily performed.

FIG. 4 shows that the support members 43 and 44 are brought into contact with a structure formed integrally with the floor 2, for example, a pillar or a wall, so that the support members 43 and 44 slide between the floor 2 and the floor 2. Preventing. The structure 61 is a wall of the building, and the structure 62
2. With such a configuration, the load acting on the support member can be borne not only on the connecting member 5 but also on the column 62, the wall 61, and the like, and the connecting member 5 can be made small. Alternatively, the strength of the connecting member 5 can be reduced.

Although FIGS. 3 and 4 show an example in which one large container 1 is provided, FIGS. 5, 8, 9 and 13 show a case where a plurality of large containers are stored in a storage facility. I have.
Since a plurality of large containers are stored in the storage facility, the large containers have a regular arrangement. In FIG. 5, ten containers are stored in a storage room surrounded by a wall 63. The supporting members 452, 453, 45 that support only one large container 1
4. 451 supporting two large containers 1; 3 large containers 1
There is an individual support 45. In addition, supporting auxiliary members 71 and 72 are fixed with bolts 5 between the supporting members 71 and 72 to position the supporting members. The support for the three large containers 1 is formed point-symmetrically, and the center of the support is fixed to the floor with bolts 5. These support members and support auxiliary members 7
1 and 72 can prevent the large container 1 from sliding on the floor 2.

By arranging the large containers 1 regularly, a large number of support members having the same shape can be used, and the cost of the support members can be reduced. In addition, a procedure in which one large container 1 is fixed to the floor 2 with the support member, the next large container 1 is fixed to the intermediate floor, and then the next large container 1 is fixed to the floor 2 with the support member. By repeating, a large space for fixing the support member with the bolts 5 can be secured, and the fixing work becomes easy. In FIG. 5, the shapes are various according to the number of large containers in contact with the support members.However, all those in contact with the large container have the same shape, and those in contact with other wall surfaces and the like have shapes corresponding to the respective shapes. You may. In this case, the support members can be further shared, and the cost can be reduced.

FIG. 6 shows a case where the support member 421 and the container 1 are integrally connected. This figure is a detailed view of the vicinity of the bottom of the large container 1. Large container 1 supported by support member 421
The belt-shaped restraining member 81 is wound around the support member 421 and the container 1 so that
Both ends of the restraining member 8 are fastened with bolts 8. The supporting member 421 is connected to the floor 2 by the connecting member 5 as in the above embodiments.
It is fixed to. According to this embodiment, it is possible to reliably prevent the large container from slipping from the floor surface.

In FIG. 6, each large container is fixed to the supporting member using a belt, but as shown in FIG.
In the example of FIG. 7, three pieces may be fixed together. Three large containers 1 are arranged in a substantially regular triangular shape outside the support member 455, and a belt-shaped restraining member 8 is wound therearound.
Also in this embodiment, the support member 45 is fixed to the floor 2 by the connecting member 5. In this embodiment, the support member 45
The bolt 5 is provided with two fastening positions so that the bolt 5 does not rotate. Further, according to the present embodiment, one support member 4
Since five large containers 1 can be supported by 5, the number of supporting members can be reduced, and construction is simplified.

FIG. 8 shows a case where a large number of large containers are stored as in FIG. Each of the support members 461 to 468 has a rod shape, and the large cylindrical container 1 is supported on six sides of the rod by combining these rods. An end of each support member 461 to 468 is in contact with or close to a wall surface of the storage facility.
Each support member is fixed to the floor 2 with bolts 5.
There is a gap between the support members and the floor 2 due to overlap,
The portion to be fastened to the floor surface with the bolt 5 sandwiches a connection assisting member having a thickness similar to that of the support member in the gap so as not to form a gap with the floor surface. Further, in FIG. 6, the members whose support members are parallel can be divided into three groups, and even if the support members of any one of the three groups are removed, each large container is removed. Can be supported by the remaining supporting members without slipping on the floor. In the case of this embodiment, since the shape of the support member is a simple rod, the support member can be easily manufactured.

FIG. 9 shows an example in which a depression 470 on the pocket is formed on one side of the support members 471 to 475 and the other side is flat. The large container 1 is held in the depression, and the large container 1 is pushed on the back side of the other support member. The embodiment is similar to the embodiment shown in FIG. 8 in that the end of the support member is in contact with or close to the wall of the storage facility. According to the present embodiment,
Only the support members 471 to 4752 at the floor 2 with bolts 5
The fixing work can be significantly reduced. Also,
After fixing one support member, the procedure of hanging the large container of the next row from the intermediate floor, fixing it to the intermediate floor, and then fixing the other support member may be repeated, and the fixing member fixing work space Can be secured, and the work of fixing the support member is facilitated.

FIGS. 10 and 11 show a case where an intervening member is provided between the large container 1 and the floor 2. In FIG. 10, the inclusion is a heat insulating material 91, and in FIG. 11, the inclusion is a cushioning material.

When the temperature of the radioactive substance contained in the small container in the large container 1 is higher than room temperature, the heat may cause the surface temperature of the large container 1 to become higher than room temperature. At this time, a heat insulating member 91 is provided between the large container 1 and the floor 2 so that heat is not transmitted from the large container 1 to the floor 2. In addition, large container 1
In order to prevent heat from being transmitted to the floor 2 via the support member 47 from the outside, a heat insulating portion 92 is also provided between the support member 47 and the floor 2. If the support member 47 has good heat insulating performance, the heat insulating material 92 need not be provided. Also, the heat insulating portion 92 is placed on the floor 2
Instead of providing between the large container 1 and the support member 47, it may be provided between the large container 1 and the support member 47.

As described above, in the embodiment of FIG. 11, when the small container is hung from the intermediate floor, a container receiving member is provided to prevent an impact force from acting between the large container 1 and the floor 2. 93 is provided between the floor 2 and the large container 1 as a cushioning material. In addition to the buffer effect, the container receiving member 93 has a heat insulating effect that does not transfer heat of the large container 1 to the floor 2, and a small container containing the radioactive material containing the large container 1 due to the contact between the large container 1 and the floor 2 or the support member 48. An effect of preventing damage to the container and the radioactive material, an effect of positioning the large container 1 at an accurate position, or a vibration isolation effect may be provided.

Referring to FIG. 12, a concave portion 1a is formed in the bottom of the large container 1, and support members 49, 4
An example is shown in which the large container 1 is fixed by inserting 90. In the present embodiment, although some processing is required on the large container side, the shape of the support member is a simple rod shape, which facilitates the manufacture, and also facilitates the fixing work of the support member.

FIG. 12 shows a case where there is one large container.
FIG. 13 shows an example in which a plurality of large containers are stored in a storage facility by the same method. As in the embodiment of FIGS.
The ends of 91 to 494 are in contact with or close to the wall surface.
In this embodiment, it is necessary to fix the support member to the floor first, but once the support member is fixed, the work in the storage facility becomes unnecessary, and there is no risk of being exposed to radiation.

14 and 15, fixing members 495 and 496 having an outer diameter smaller than the outer diameter of the large container 1 are fixed to the floor 2, and the supporting members 4 are provided in the depressions 1b provided at the bottom of the large container 1.
An example in which 95.496 is fitted is shown. FIG. 15 shows a case where the thickness of the support member 495 is thinner than the depth of the depression 1b.
Is a case where the thickness of the supporting member 496 is about the depth of the depression 1b. To prevent the heat of the large container 1 from being transmitted to the floor 2,
As in the embodiment shown in FIG.
A heat insulating member is sandwiched between the floor 96 and the floor 2. According to this embodiment, the large container can be stored densely in the storage facility.

FIGS. 16 and 17 show the large container receiving member 9.
4 shows an example in which the large container 1 is supported by the support member 497 through the support member 4. According to this embodiment, a heat insulating material or a cushioning material can be used for the large container receiving member, and the large container receiving member can be prevented from being transmitted to the heating porridge in the large container, or can be prevented from being damaged by impact. .

In any of the above embodiments, a predetermined gap may be formed between the support member and the large container in consideration of thermal deformation of the large container during storage.

[0029]

According to the present invention, in a radioactive material storage facility for storing a plurality of containers containing radioactive materials, the stress applied to the large containers is reduced, so that the large containers can be stored in the radioactive material storage facility with high reliability. it can. In addition, since the bending moment is not applied to the support member, the container containing the radioactive substance can be reliably held by the simple support member fixing means.

[Brief description of the drawings]

FIG. 1 is a front view of one embodiment of a radioactive substance storage facility according to the present invention.

FIG. 2 is a perspective view of one embodiment of a radioactive substance storage facility according to the present invention.

FIG. 3 is a top view of one embodiment of the support member according to the present invention.

FIG. 4 is a top view of another embodiment of the support member according to the present invention.

FIG. 5 is a diagram showing an arrangement of support members in the radioactive substance storage facility according to the present invention.

FIG. 6 is a front view of another embodiment of the support member according to the present invention.

FIG. 7 is a top view of another embodiment of the support member according to the present invention.

FIG. 8 is a view showing an arrangement of support members in the radioactive substance storage facility according to the present invention.

FIG. 9 is a view showing an arrangement of support members in the radioactive substance storage facility according to the present invention.

FIG. 10 is a front view of another embodiment of the support member according to the present invention.

FIG. 11 is a front view of another embodiment of the support member according to the present invention.

FIG. 12 is a perspective view of another embodiment of the support member according to the present invention.

FIG. 13 is a view showing an arrangement of support members in the radioactive substance storage facility according to the present invention.

FIG. 14 is a front view of another embodiment of the support member according to the present invention.

FIG. 15 is a front view of another embodiment of the support member according to the present invention.

FIG. 16 is a top view of another embodiment of the support member according to the present invention.

FIG. 17 is a front view of another embodiment of the support member according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Large container, 1a ... Depression, 1b ... Depression, 2 ... Floor, 3 ... Intermediate floor, 4 ... Support member, 5 ... Connection member (bolt), 8 ... Restriction member, 11 ... Lid, 41, 42, 42a, 42b: Support member, 43, 44, 45, 47, 48: Support member, 6
1, 63 ... wall, 62 ... pillar, 71, 72 ... support auxiliary member,
81: bolt, 91: heat insulating material, 93: cushioning material, 94: large container receiving member, 421, 451 to 455, 461 to 46
8. Support members, 470: depressions, 471 to 475: support members, 490 to 497 support members.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tadahiro Hoshikawa 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Pref. Hitachi, Ltd. Hitachi Works, Ltd. (72) Inventor Hirokuni Ishigaki 3-1-1, Sachimachi, Hitachi-shi, Ibaraki No. 1 Inside Hitachi, Ltd. Hitachi Works

Claims (6)

[Claims] 1. A radioactive substance storage facility for storing a plurality of large containers for accommodating a radioactive substance using an intermediate floor, wherein a plurality of support members are provided at an outer peripheral portion of a bottom portion of the large container at intervals in a circumferential direction. A radioactive substance storage facility, wherein the radioactive substance storage facility is disposed and the support member is fixed to a floor surface. 2. The radioactive substance storage facility according to claim 1, wherein at least one of a heat insulating material and a buffer material is disposed between the large container and the floor surface. 3. The radioactive substance storage facility according to claim 1, wherein the support member is a plurality of rod-shaped members. 4. The radioactive substance storage facility according to claim 1, wherein the support member is a plurality of plate members having a depression on one side for sandwiching the large container, and the other surface being a flat plate. . 5. The radioactive substance storage facility according to claim 1, wherein the support member has a shape in which an arc-shaped notch is provided at each vertex of a triangle. 6. In a radioactive substance storage facility for storing a plurality of large containers for storing radioactive substances using an intermediate floor, a support member is disposed on an outer peripheral portion of a bottom portion of the large container, and the support member is provided with the large member. Radioactive substance storage equipment characterized by being discontinuous in the circumferential direction of the container.