JP2008249526A - Transportation of or storage container for radioactive substance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transportation of or storage container for a radioactive substance, provided with structure capable of supporting it without having to use using a high-strength material, such as martensite stainless steel, and which facilitates easy handling. <P>SOLUTION: A storage container 50 for the radioactive substance is provided with ring-like protrusions 4 (4a, 4b), provided along a circumferential direction orthogonal to an axis direction of this container 9 of the present invention for transporting or storing the radioactive substance, in an outer circumferential face of the container 9. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a transport or storage container for a radioactive substance having a radiation shielding function.

  Transport or storage containers (casks) for radioactive materials such as spent nuclear fuel (hereinafter referred to as radioactive materials) generated at nuclear power plants, etc., have a sealing function to confine radioactive materials, and uranium 235 slightly remaining in spent nuclear fuel A criticality prevention function to prevent criticality due to nuclear fission, a heat removal function to release the decay heat of radioactive materials and lower the temperature of the components of the container and spent nuclear fuel appropriately, and to shield gamma rays and neutrons Four safety functions are required: a shielding function for reducing external dose rate and preventing radiation exposure.

  This cask is required to have structural strength to maintain these safety functions in the event of a fall accident or fire accident, and it is a standard under conditions specified by regulations such as drop collision conditions, fire resistance conditions, and immersion conditions. It must be a cask that satisfies the requirements. Therefore, the cask is a heavy object having a total weight of, for example, 100 t or more. For this reason, many techniques related to means and methods for transporting a very heavy cask having a total weight of 100 t or more and moving it to the storage position of the storage place have been proposed. For example, there are techniques as shown below.

  Conventionally, a cask in which columnar protrusions generally called trunnions are attached to the upper part and the lower part of a side surface has been disclosed (for example, see Patent Document 1). When the cask described in Patent Document 1 is transported and moved to the storage position of the storage place, for example, the cask is used by a crane or the like via at least one cylindrical trunnion attached to the upper and lower parts of the cask. It is lifted and hung, and the posture is changed (generally called handling), or it is fixed to the transportation platform.

  Moreover, the technique regarding the method of conveying a radioactive substance storage container using an air pallet conveying apparatus is also disclosed (for example, refer patent document 2). The method of transporting a radioactive substance storage container described in Patent Document 2 is a method of transporting a radioactive substance storage container placed on a gantry to a storage position using an air pallet transport device having a structure for blowing air to the floor surface. It is.

  Further, a technique related to a method of transporting a radioactive substance storage container using a plurality of protrusions (angle members) provided on the lower side of the outer peripheral part of the radioactive substance storage container or a plurality of recesses formed on the lower side of the outer peripheral part is also disclosed. (For example, see Patent Document 3). In this method of transporting a radioactive substance storage container described in Patent Document 3, a radioactive substance is stored by applying a pushing force to a plurality of protrusions provided on the lower side of the outer peripheral part or a plurality of recesses formed on the lower side of the outer peripheral part. In this method, the container is temporarily lifted, an air pallet transport device or the like is inserted below, and the radioactive substance storage container is placed on the air pallet transport device for transport.

  Furthermore, a technique related to a device that transports a cask using a plurality of support members (cylindrical trunnions) provided on the side of the cask without inserting an air pallet transport device below the cask is also disclosed ( For example, see Patent Document 4). The cask conveying device described in Patent Document 4 lifts the cask by causing the buoyancy of the air pallet conveying device to act on a plurality of support members provided on the side portion of the cask via load transmitting means (arms). It is a device that transports a cask with a pallet transport device.

JP 2002-250790 A JP 2003-156594 A JP 2004-184183 A JP 2006-58106 A

  However, as described above, a cask that is a container for transporting or storing radioactive materials is a very heavy object having a total weight of, for example, 100 t or more. For this reason, the load which acts on the trunnion which consists of the cylindrical protrusion described in patent document 1 at the time of handling of a cask becomes very large. Therefore, it is necessary to ensure the strength that can be withstood when handling the cask in the cylindrical trunnion. For example, a high-strength material such as martensitic stainless steel, which is a precipitation hardening type stainless steel, is used for the trunnion material. There is a need. This precipitation hardening SUS steel is a relatively expensive material.

  In addition, the method for transporting the radioactive substance storage container described in Patent Document 2 uses a cylindrical trunnion as in Patent Document 1 when the radioactive substance storage container is placed on the base or fixed to the base. is doing.

  Moreover, the several protrusion part used by the method of conveying the radioactive substance storage container described in patent document 3 is an angle material, and is similar to the cylindrical trunnion described in patent documents 1 and 2, during handling. Since the acting load becomes very large, it is necessary to use a high strength material. Further, the plurality of recesses is not preferable from the viewpoint of the radiation shielding function of the radioactive substance storage container.

  In addition, the cask transport device described in Patent Document 4 supports the columnar trunnion described in Patent Documents 1 and 2 with an air pallet transport device via a load transmission means (arm), lifts the cask, and lifts the cask. As with Patent Documents 1 and 2, the load acting on the trunnion is very large, and it is necessary to continue to support a heavy cask with the trunnion during transportation.

  The present invention has been made in view of the above circumstances, and the object thereof is to provide a structure that can be supported without using a high-strength material such as martensitic stainless steel and can be easily handled. It is to provide a cask which is a transport or storage container for radioactive material.

Means and effects for solving the problems

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have used a ring-shaped protrusion instead of using a trunnion made of a cylindrical protrusion as in the prior art, so that the load acting on the protrusion is reduced. It has been found that the container can be supported without using a special high-strength material as a material for the protrusion, and handling can be easily performed, thereby solving the above-mentioned problems. The present invention has been completed based on this finding.

  The present invention relates to a transport or storage container for a radioactive substance having a radiation shielding function. And the transport or storage container of the radioactive substance which concerns on this invention has the following some features in order to solve the said subject. That is, the radioactive substance transport or storage container of the present invention comprises the following features alone or in combination as appropriate.

  In order to achieve the above object, the first feature of the radioactive material transport or storage container according to the present invention is a container for transporting or storing the radioactive substance, and an outer peripheral surface of the container orthogonal to the axial direction of the container. And a ring-shaped protrusion provided in the circumferential direction.

  According to this configuration, the load acting on the ring-shaped protrusion is dispersed when the radioactive substance is transported or handled when the storage container (cask) is lifted, suspended, or changed in posture. Dispersion of the load acting on the ring-shaped protruding portion reduces the stress generated in the protruding portion, so that the cask can be supported without using a special high-strength material, and handling can be easily performed.

  A second feature of the radioactive material transport or storage container according to the present invention is that the ring-shaped protrusions have a plurality of arc-shaped members having a longitudinal direction in the circumferential direction and arranged at predetermined intervals. It consists of

  According to this configuration, as described above, when handling the cask, the load acting on the ring-shaped protrusion is dispersed, the stress generated in the protrusion is reduced, and the cask can be supported without the need to use a special high-strength material. At the same time, handling can be easily performed.

  The third feature of the radioactive substance transport or storage container according to the present invention is that the ring-shaped protrusion is disposed above the center of gravity of the container.

  According to this configuration, when handling the cask, the cask is supported above the position of the center of gravity of the container, so that stable handling can be performed without overturning the cask.

  A fourth feature of the radioactive substance transport or storage container according to the present invention is that the ring-shaped protrusion is disposed at a lower part of the container.

  According to this configuration, when it is necessary to firmly fix the cask for earthquake resistance when storing the cask at the storage position, the cask is moved to the storage position using the ring-shaped protrusion disposed at the lower part of the container. Can be firmly fixed in a simple and space-saving manner.

  Further, a fifth feature of the radioactive substance transport or storage container according to the present invention is that the ring-shaped protrusion is disposed above the center of gravity of the container and below the container. .

  According to this configuration, the upper ring-shaped protrusion can be used when handling the cask, and the lower ring-shaped protrusion can be used when firmly fixing in the storage position. In addition, since the upper and lower ring-shaped protrusions can be used when fixing at the storage position, the cask can be fixed more firmly.

  Further, a sixth feature of the radioactive substance transport or storage container according to the present invention is that the container has an inner body part and an outer body part, and an inorganic material is provided between the inner body part and the outer body part. System neutron shielding material is inserted.

When an inorganic neutron shielding material is used for the cask, the shielding thickness increases. Casks using inorganic neutron shielding materials are heavier than metal casks using, for example, resin neutron shielding materials, and in the case of trunnions made of conventional cylindrical projections, the load concentration acting on the trunnions Because of this problem, handling must be more careful and handling is not easy.
When the ring-shaped protrusion according to the present invention is used, the handling property of the cask is remarkably improved as compared with the conventional cylindrical trunnion.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. A radioactive material transport or storage container (cask) according to the present invention includes a transport container for transporting radioactive material, a storage container for storing radioactive material, and transport and storage for transporting and storing radioactive material. A cask used as a container. The cask described below is a so-called concrete cask that is mainly used for storing radioactive substances, and is therefore expressed as a radioactive substance storage container (hereinafter referred to as a storage container). FIG. 1 is a schematic perspective view showing a storage container according to an embodiment of the present invention. FIG. 2 is a schematic view showing a plan view shape of a storage container according to an embodiment of the present invention.

  As shown in FIG. 1, a storage container 50 according to this embodiment is provided with a cylindrical container 9 for storing radioactive substances, and a circumferential direction orthogonal to the axial direction of the container 9 on the outer peripheral surface of the container 9. And a ring-shaped protrusion 4. In addition, the cross-sectional shape orthogonal to the axial direction of the container 9 may be not only a circle but a polygon, such as a quadrangle, a pentagon, and a hexagon, and an ellipse. In addition, as described above, the storage container 50 according to the present embodiment is a so-called concrete cask, and therefore the container 9 is mainly used for storing radioactive substances. However, the radioactive substance transport or storage container according to the present invention is a cask for transporting radioactive substances, storing radioactive substances, and transporting and storing radioactive substances. A container in a transport or storage container for radioactive material is a container used to transport radioactive material, store radioactive material, and transport and store radioactive material.

  The container 9 includes a sealed container 7 and a shielding housing 16 disposed outside thereof. The sealed container 7 includes a basket 5 that stores the radioactive substance X therein, a primary lid 3 that mainly has a shielding function, and a secondary lid 2 that mainly has a sealing function, and the shielding housing 16 includes an inner cylinder 6. (Inner body part), outer cylinder 8 (outer body part), a layer of reinforced concrete that is one of the inorganic shielding materials inserted between them, and a shielding lid 1 are provided. The basket 5, the sealed container 7, and the outer cylinder 8 are arranged coaxially and each have a bottom portion and are made of a metal material such as carbon steel or stainless steel. The basket 5 has a plurality of plate-like members made of metal (for example, a metal material added with a neutron absorbing material such as boron-added aluminum alloy or boron-added stainless steel) arranged alternately in a grid pattern. The space for accommodating the radioactive substance X is formed. The primary lid 3 and the secondary lid 2 of the sealed container 7 are made of a metal material such as carbon steel or stainless steel, and the shielding lid 1 is made of a concrete material inside the metal material such as carbon steel or stainless steel. It is the structure which has.

  A ventilation layer 15 is formed in the axial direction of the container 9 by the inner cylinder 6 disposed with a gap between the sealed container 7 and the inner cylinder 6. The lower end of the ventilation layer 15 communicates with the air supply port 11 provided at the lower portion of the container 9, and the upper end of the ventilation layer 15 communicates with the exhaust port 10 provided at the upper portion of the container 9. Here, when the concrete is exposed to a high temperature environment and the temperature rises, the moisture content of the concrete tends to decrease, thereby reducing the neutron shielding ability of the concrete. The ventilation layer 15 prevents the temperature of the concrete 12 from increasing by removing the heat of the radioactive substance X by natural convection of air.

  As the inorganic neutron shielding material inserted between the sealed container 7 and the outer cylinder 8 (between the inner cylinder 6 (inner trunk) and the outer cylinder 8 (outer trunk)), not only concrete 12 but also mortar It may be. Further, concrete containing an admixture such as blast furnace slag fine powder may be used.

  Next, as shown in FIG. 2A, the ring-shaped protrusion 4 provided in the circumferential direction of the container 9 is a ring-shaped member that continues continuously without terminating in the circumferential direction orthogonal to the axial direction of the container 9. ing. FIG. 2B is a schematic view for showing a ring-shaped protrusion 14 which is a modification of the ring-shaped protrusion 4. As shown in FIG. 2B, the ring-shaped protrusions 14 provided in the circumferential direction of the container 9 are a plurality of arcuate shapes having a longitudinal direction in the circumferential direction of the container 9 and arranged at predetermined intervals. It consists of the member 13.

  By making the protrusion provided on the outer peripheral surface of the container 9 into a ring shape like the ring-shaped protrusion (4, 14), the load of the container 9 acting on the ring-shaped protrusion (4, 14) is dispersed. The stress generated in the protrusion is reduced by dispersing the load acting on the ring-shaped protrusion (4, 14). Therefore, the storage container 50 can be supported without using a special high-strength material as the material of the ring-shaped protrusions (4, 14), and the storage container 50 can be easily handled. Examples of the material for the ring-shaped protrusions (4, 14) include austenitic stainless steel such as SUS304 and carbon steel used as a general structural material.

  In particular, the storage container 50 of this embodiment forms a layer of concrete 12 that is one of inorganic neutron shielding materials between the sealed container 7 and the outer cylinder 8 (between the inner cylinder 6 and the outer cylinder 8). Concrete transport and storage container. On the other hand, there is a metal cask made of a metal material, for example, a resin such as ethylene propylene rubber as a neutron shielding material. The storage container 50, which is a concrete cask, is heavier than a metal cask and is, for example, a very heavy object such as 100t to 200t. However, by using the ring-shaped protrusions (4, 14) that can support the load in a distributed manner, the storage container 50 can be operated more easily than the conventional cylindrical trunnion as described above. Therefore, the handling property of the storage container 50 is significantly improved. That is, by applying the ring-shaped protrusions (4, 14) to the concrete storage container 50 as in the present embodiment, the effect is more manifested from the viewpoint of handling properties. Needless to say, the ring-shaped protrusions (4, 14) according to the present invention can also be applied to a metal cask.

  Returning to FIG. 1, in the present embodiment, of the two ring-shaped protrusions 4 (4 a, 4 b) provided on the container 9, the ring-shaped protrusion 4 a disposed on the top of the container 9 is the container 9. Is located above the center of gravity position G. Thus, when the storage container 50 is handled, the storage container 50 is supported above the position of the center of gravity of the container 9, so that stable handling is possible without causing the storage container 50 to fall.

  Further, the ring-shaped protrusion 4 b is disposed at the lower part of the container 9. Thus, for example, when the storage container 50 is stored at the storage position of the storage place, when it is necessary to firmly fix it for earthquake resistance, the storage is performed using the ring-shaped protrusion 4b arranged at the lower part of the container 9. The storage container 50 can be firmly fixed to the position in a simple and space-saving manner. When the storage container 50 is fixed at the storage position, both the upper and lower ring-shaped protrusions 4 (4a, 4b) can be used, so that the storage container 50 can be fixed more firmly. is there.

  Next, the ring-shaped protrusion in the radioactive material transport or storage container according to the present invention will be described in more detail. FIG. 3 is a schematic view showing a part of a cross-sectional shape of a storage container according to an embodiment of the present invention. Here, FIG. 3A is a schematic view for showing a cross-sectional shape along the axial direction of the container 9 in the ring-shaped protrusion 4 shown in FIG. 1, and FIG. It is a schematic diagram for showing ring-shaped projection part 4 'which is a modification of this.

  As shown in FIG. 3A, the ring-shaped protrusion 4 of the storage container 50 has a base 22 embedded in the concrete 12 so as to be flush with the outer cylinder 8, and the axis of the container 9 more than the base 22. The projecting portion is integrally formed so as to have a projecting portion 21 that has a short length in the radial direction of the container 9 from the outer cylinder 8. The cross-sectional shape of the base 22 is a rectangle, and the cross-sectional shape of the protrusion 21 is a square or a rectangle. In the circumferential direction orthogonal to the axial direction of the container 9, the ring-shaped protrusion 4 may be integrally formed without a terminal, or a plurality of arc-shaped members are adjacent to each other without a gap so as to be continuous without a terminal. The ring-shaped protrusion 4 may be formed by welding or the like. Further, when the concrete 12 is reinforced concrete, workability is improved if the base 22 of the ring-shaped protrusion 4 is temporarily attached to the reinforcing bar in advance.

  A ring-shaped protrusion 4 ′ shown in FIG. 3B is a modification of the ring-shaped protrusion 4 shown in FIG. As shown in FIG. 3 (b), the ring-shaped protrusion 4 ′ has a base 22 having a concave portion embedded in the concrete 12 and a protrusion 21 protruding in the radial direction of the container 9 as parts. Manufactured and joined by bolts or welding. With such a structure, it is possible to avoid occurrence of shear stress at the joint portion between the base portion 22 and the protruding portion 21. In the circumferential direction orthogonal to the axial direction of the container 9, at least one of the base portion 22 and the projecting portion 21 may be integrally formed without termination, or a plurality of arc-shaped members may be formed continuously without termination. You may form ring-shaped projection part 4 'by welding etc. adjacent to each other without a gap. The base portion 22 and the protruding portion 21 are joined together by bolts or welding to form the ring-shaped protruding portion 4 ′, so that the base portion 22 and the protruding portion 21 are integrated with the ring-shaped protruding portion 4 integrally formed by cutting or the like, for example. Manufacturing costs are reduced. When the concrete 12 is reinforced concrete, workability is improved if the base 22 is temporarily attached to the reinforcing bar in advance.

  FIG. 4 is a schematic diagram for showing a ring-shaped protrusion 4 ″ which is a modification of the ring-shaped protrusion 4. As shown in FIG. 4, a groove is provided on the outer peripheral surface of the outer cylinder 8 to fit the protruding portion 21 in the circumferential direction orthogonal to the axial direction of the container 9, and the protruding portion 21 is fitted to this groove, The protrusion 21 may be coupled to the outer cylinder 8 of the container 9 by bolts or welding to form the ring-shaped protrusion 4 ″.

  Next, a modification of the protrusion 21 of the ring-shaped protrusion 4 will be described. FIG. 5 is a schematic view showing a part of a cross-sectional shape of a radioactive substance storage container according to an embodiment of the present invention. Here, FIG. 5A is a schematic view for showing a ring-shaped protrusion 31 provided with a protrusion 24 which is a modification of the protrusion 21 shown in FIG. 3B, and FIG. These are the schematic diagrams for showing the ring-shaped projection part 32 provided with the protrusion part 25 which is another modification of the protrusion part 21 shown in FIG.3 (b).

  As shown in FIG. 5A, the cross-sectional shape along the axial direction of the container 9 in the protruding portion 24 is a triangular shape having a bottom on the lower side of the protruding portion 24. Further, as shown in FIG. 5B, the cross-sectional shape along the axial direction of the container 9 in the protruding portion 25 is such that one side on the radially outer side of the container 9 is the other side on the axial center side of the container 9 in contact with the base 22. The bottom surface of the protruding portion 25 is a slope that slopes downward as the distance from the axial center of the container 9 increases. A jig for handling the storage container is locked to the lower surface of these protrusions (24, 25), and the storage container is lifted or hung, or the posture is changed. In addition, the slope which inclines below as it leaves | separates from the axial center of the container 9 formed in the lower surface of the protrusion part 25 is preferable as a jig | tool removal prevention at the time of handling. Further, the structure is not limited to the projecting portions (24, 25) shown in FIG. 5 as long as the jig for supporting the container 9 can be locked from the lower side of the container 9.

  Next, lifting of the storage container 50 using the ring-shaped protrusion 4 (4a) will be described. FIG. 6 is a schematic view showing a state in which the storage container 50 shown in FIG. 1 is lifted.

  As shown in FIG. 6, for example, a ring-shaped steel jig 41 with a wire rope 42 attached thereto is locked to the ring-shaped protrusion 4 a from below the ring-shaped protrusion 4 a of the storage container 50 to store the storage container 50. Is lifted by an overhead crane (not shown) or the like, and the storage container 50 is transported (moved). Thereby, the storage container 50 can be conveyed with the storage attitude | position of a perpendicular direction. If the height at which the storage container 50 is lifted is adjusted, it can be conveyed even if the floor surface has some unevenness. In addition, an air pallet transfer device (not shown) having a structure in which the storage container 50 is temporarily lifted by an overhead crane using the ring-shaped protrusion 4a and the air is blown to the floor surface below the storage container 50. You may insert and convey the storage container 50 using an air pallet conveying apparatus. If an air pallet conveying device is used, it can be moved so as to crawl on the floor surface, so that stable conveyance is possible. As described above, the storage container 50 according to the present embodiment is a concrete cask, and is a heavier weight than a metal cask. That is, it is more preferable to use the ring-shaped protrusion 4 according to the present invention for a very heavy object such as the storage container 50.

  Next, fixing of the storage container 50 using the ring-shaped protrusion 4 (4b) will be described. FIG. 7 is a schematic diagram showing a state in which the storage container 50 shown in FIG.

  As shown in FIG. 7, the ring-shaped protrusion 4 b of the storage container 50 is sandwiched between, for example, two divided arc-shaped steel securing members 44 in plan view, and the storage container 50 is sandwiched between the steel securing members 44. The storage container 50 can be firmly fixed by fixing the steel fixation member 44 to the floor surface 43 with an anchor bolt or the like in the collapsed state. Further, since the pinching force received by the ring-shaped protrusion 4b is dispersed by the ring-shaped protrusion 4b formed in the circumferential direction of the storage container 50, a wide securing area where the pinching force acts is ensured. The storage container 50 can be stably fixed.

  Next, a method for lifting the storage container 50 using the ring-shaped protrusion 4 (4a) and transporting the inside of the facility without using an overhead crane will be described. FIG. 8 is a schematic view showing a transfer device 60 for transferring the storage container 50 shown in FIG.

  As shown in FIG. 8, the transport device 60 for transporting the storage container 50 includes an arc-shaped arm 61 that supports the ring-shaped protrusion 4 a of the storage container 50 from below the ring-shaped protrusion 4 a, and an arm 61. The arm drive device 62 which connects and raises / lowers the arm 61 up and down, and the traveling device 63 which carries the arm drive device 62 and conveys the storage container 50 in a lifted state are provided. The arm 61 is formed in a shape and a dimension along the outer peripheral surface of the container 9. The arm drive device 62 is driven by hydraulic pressure or electric drive. Examples of the traveling device 63 include a device provided with electrically driven wheels 64 or an air pallet provided with a structure for blowing air to the floor surface. Further, the end portion on the arm 61 side of the traveling device 63 is formed in a concave shape with a shape and dimensions along the outer peripheral surface of the container 9 as shown in FIG.

  First, the arm 61 of the transport device 60 is lowered below the ring-shaped protrusion 4 a provided on the storage container 50 by the arm driving device 62, and the transport device 60 is placed sideways on the storage container 50. Next, the arm 61 is moved upward by the arm driving device 62 and is slowly brought into contact with the ring-shaped protrusion 4a. And the arm 61 is further raised, the storage container 50 is lifted, and the inside of the facility is transported by the traveling device 63 in a state where the storage container 50 is lifted. In this way, the storage container 50 can be transported without using an overhead crane. Since it is not necessary to use an overhead crane, it is not necessary to install an overhead crane in the building, and the storage container 50 can be transported outdoors without an overhead crane. Further, if the transfer device 60 is used, it can be moved over the floor surface, so that stable transfer is possible.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims.

It is a schematic perspective view which shows the storage container of the radioactive substance which concerns on one Embodiment of this invention. It is a schematic diagram which shows the planar view shape of the storage container of the radioactive substance which concerns on one Embodiment of this invention. It is a schematic diagram which shows a part of cross-sectional shape of the storage container of the radioactive substance which concerns on one Embodiment of this invention. It is a schematic diagram which shows a part of cross-sectional shape of the storage container of the radioactive substance which concerns on one Embodiment of this invention. It is a schematic diagram which shows a part of cross-sectional shape of the storage container of the radioactive substance which concerns on one Embodiment of this invention. It is a schematic diagram which shows the state which lifted the storage container of the radioactive substance shown in FIG. It is a schematic diagram which shows the state which fixed the storage container of the radioactive substance shown in FIG. 1 to the mount frame. It is a schematic diagram which shows the conveying apparatus for conveying the storage container of the radioactive substance shown in FIG.

Explanation of symbols

4, 14: Ring-shaped protrusion 6 Inner cylinder (inner trunk)
7: Sealed container 8: Outer cylinder (outer trunk)
9: Container 12: Concrete (inorganic neutron shielding material)
13: Arc-shaped member 50: Storage container for radioactive material

Claims (6)

A container for transporting or storing radioactive material;
A transport or storage container for a radioactive material, comprising: a ring-shaped protrusion provided on an outer peripheral surface of the container in a circumferential direction orthogonal to the axial direction of the container.   2. The transport or storage of a radioactive substance according to claim 1, wherein the ring-shaped protrusion is composed of a plurality of arc-shaped members having a longitudinal direction in the circumferential direction and arranged at a predetermined interval. container.   3. The radioactive substance transport or storage container according to claim 1, wherein the ring-shaped protrusion is disposed above the center of gravity of the container. 4.   The radioactive ring transportation or storage container according to claim 1, wherein the ring-shaped protrusion is disposed at a lower portion of the container.   The radioactive ring transportation or storage container according to claim 1, wherein the ring-shaped protrusions are disposed above the center of gravity of the container and below the container. .   The container has an inner trunk part and an outer trunk part, and an inorganic neutron shielding material is inserted between the inner trunk part and the outer trunk part. Item 6. A radioactive material transport or storage container according to any one of Item 5.

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