JPS6259280B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shipping container for transporting low-level radioactive waste in which heat generation from radioactive materials is almost negligible.

Currently, a large amount of radioactive waste is generated in business establishments that handle nuclear fuel materials, among which low-level solid waste is mainly stored in drums. In the case of nuclear power plants, this quantity is generated in the thousands per year.
Storage within business premises has now reached its limit.

On the other hand, from a legal perspective, the legal system regarding the transportation of radioactive materials has been rapidly developed in recent years, and when transporting radioactive materials on general roads outside the workplace, it is necessary to performance and shielding performance, etc.
Transport conditions different from normal transport will be imposed. Additionally, there is an opportunity to establish and implement standards for each workplace when transporting within a workplace.

Due to the above-mentioned circumstances, when transporting radioactive materials, etc., both inside and outside the workplace, there is a need for transport containers that satisfy laws and standards.

Therefore, the present invention was achieved as a result of research to provide a container for transporting radioactive materials that satisfies the above-mentioned laws and standards. A storage container is provided within the outer shell of the container and supports the shock absorber, and a plurality of internal storage bodies each having an opening and a door for sealing the opening are disposed within the storage container. ,
A radiation shielding material and a heat insulating material are arranged on the surfaces of the internal storage body and the storage container, and a heat insulation material is filled between the internal storage body and the storage container and between the storage container and the outer shell of the container. A low-level radioactive material transport container that can obtain impact resistance, sealing performance, fire resistance, and shielding performance that satisfies laws and regulations, and also allows for easy loading and unloading of radioactive materials. The purpose is to provide.

Next, embodiments of the present invention will be described with reference to the drawings.

In the figure, a container 1 for transportation mounted on a vehicle (not shown) is essentially composed of a container shell 2, a storage container 3, and members for satisfying various performances.

First, the container outer shell 2 will be explained. This container outer shell 2 is a container shell 2 that is normally used or a slightly reinforced version of the same, and can be stored by opening the side or top surface of the container outer shell 2. container 3
It is formed so that it can be attached to and removed from it.

Next, explaining the storage container 3, the storage container 3 shown in FIGS. 1a, b, and c has an outer frame or an outer box 4.
and a large number of cylindrical internal storage bodies 5 provided therein,
It consists of a door 6 that seals the opening of this internal storage body 5, and in this embodiment, it is a drum containing radioactive material, a solid radioactive material in the shape thereof, or a drum containing radioactive material. When loading and unloading other similar containers (hereinafter simply referred to as drums) 7 from the internal storage body 5,
An internal storage body 5 and a door 6 are arranged so that the drum can 7 can be put in and taken out in the axial direction. Also, Figure 2a
In the storage container 3 of the embodiment shown in , the internal storage body 5 and the door 6 are arranged so that the drum 7 is placed horizontally, that is, the drum can 7 is placed in and taken out in the radial direction. Furthermore,
The storage container 3 of the embodiment shown in FIG. 3a is formed so that drums assembled to some extent on a pallet 8 can be taken in and out of the internal storage body 5.

In any of these internal storage bodies 5, the door 6
The sealing performance when closed is based on the minimum standards of laws and regulations that ``do not scatter the contents of the internal storage outside'' in the event of a shock.
10 ^-3 _Acc /sec or less, and is appropriately determined according to the level of contents, etc. In addition, when sealing performance is not so required, as shown in FIG. 1 c or 2 c, a plurality of drums 7 are placed in one bottomed internal storage 5 and the door 6 is closed from one side. However, if particularly high sealing performance is required, for example, as shown in FIG. 1b or FIG. It is sufficient to seal each 71 pieces independently. In this case, the internal storage body 5 is opened and closed using the doors 6 at both ends. Furthermore, drum can 7
In sealing not only the internal storage body 5,
The storage container 3 and the container shell 2 can also have a sealed structure.

Between the storage container 3 formed in this way and the container outer shell 2, especially at the shoulder of the storage container 3, there is wood,
A shock absorber 10 formed of a honeycomb structure or other material capable of absorbing energy is interposed. This is for mitigating the impact force applied to the storage container 3 when the container 1 falls over, and is formed in a shape and size that satisfies the impact resistance performance required by laws and regulations. Note that depending on the material of the shock absorber 10, a shielding material may be added or it may also serve as a part of a heat insulating material.

On the other hand, in order to prevent radiation from leaking to the outside, shielding materials are attached to the surface of the internal storage body 5, the surface of the door 6, the surface of the storage container 3, etc. in the cavity 11 of the storage container 3. It is designed to satisfy the shielding performance required by laws and regulations.

Furthermore, appropriate heat insulating material is placed in the gap 11 of the storage container 3 and the gap 12 between the container shell 2 and the storage container 3 depending on the required fire resistance.

In this way, in order to load and unload the drum 7 into the container 1 configured to satisfy each performance required by laws and regulations, etc., the container 7 is From both sides of 1, as well as Fig. 1 c, Fig. 2 c, and Fig. 3 b.
In the embodiment shown in FIG. 1, the containers can be taken in and out from one side or the top of the container 1 by hand by a worker, a forklift, a crane, or the like.

As described above, according to the present invention, the posture of the radioactive material stored in the storage section is restricted, so that the load will not collapse even if vibrations or the like are transmitted during transportation.

In addition, in addition to sealing the internal storage, shock absorbers, radiation shielding materials, and heat insulating materials have been placed in appropriate locations to ensure impact resistance, sealing performance, and fire resistance that satisfy laws and regulations and standards set by each business site. It is possible to obtain shielding performance. Furthermore, since a plurality of internal storage bodies are formed in one storage container, it becomes easy to load and unload even a large number of radioactive materials. In addition, since the present invention targets low-level radioactive waste where the heat generation from radioactive materials is almost negligible, the heat dissipation from the waste can be considered to be virtually zero. Even if it is surrounded by multiple layers of heat insulating material, there is no risk of the internal temperature rising.

Therefore, it is an extremely useful invention that allows radioactive materials to be safely and easily transported both inside and outside of a business office.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1a is an explanatory diagram of the front view, FIG. 1b is an explanatory diagram of the side view, and FIG. 1c is another example corresponding to FIG. FIG. 2a is an explanatory side view showing the embodiment, FIG. 2a is an explanatory front view showing another embodiment, FIG. 2b is an explanatory side view thereof, and FIG. FIGS. 3A and 3B are explanatory diagrams in a side view showing another corresponding embodiment, and FIGS. 3A and 3B are explanatory diagrams in a front view and a side view showing still another embodiment. 2...Container outer shell, 3...Storage container, 5...Inner storage body, 6...Door, 7...Drum containing radioactive material, or solid radioactive material in that form,
Furthermore, other containers similar to drums containing radioactive materials, 10...shock absorbers, 11, 12
...Void area.

Claims (1)

[Claims] 1. A shock absorber is arranged at a corner inside the container outer shell, a storage container is provided within the container outer shell and supported by the shock absorber, and the storage container has an opening and the opening A plurality of internal storage bodies each having a door for sealing the area are arranged, and a shielding material is arranged on the surfaces of the internal storage body and the storage container, and between the internal storage body and the storage container and between the storage container and the outside of the container. A radioactive material transport container characterized by having a heat insulating material filled between the shells.