JP3174865U - Storage container - Google Patents

Abstract

Provided is a storage container that is easy to handle, easy to transport, excellent in durability, low in price, and high in radiation shielding rate.
A storage container 10 stores contaminants due to radioactive substances, and is provided so as to cover an outer periphery of a side portion of the inner container 11 with an interval between the inner container 11 and the inner container 11. And a shield 12. The inner container 11 has a container body 11A made of plastic and a lid 11B. The shield 12 is made of concrete, and is divided into a plurality in the height direction.
[Selection] Figure 1

Description

  The present invention relates to a storage container for storing contaminants contaminated with radioactive substances such as cesium 137 and cesium 134.

  With the accident at TEPCO's Fukushima Daiichi Nuclear Power Station, contamination by radioactive materials such as cesium 137 and cesium 134 has become a problem. Radioactive materials released into the atmosphere fall to the ground due to rain and adhere to soil, vegetation, buildings, and the like. As a decontamination method, for example, it is considered that contaminants such as contaminated soil and vegetation are removed and stored in a storage container for shielding. As a decontamination procedure, first place contaminants in each container in a storage container, isolate them temporarily, store them in temporary storage, store them for about three years, and then transport them to an intermediate storage facility for storage. However, it will be transported to the final disposal facility within 30 years for disposal. Therefore, as a storage container for storing and storing radioactive contaminants, it is easy to handle in each house, etc., easy to transport, excellent durability, low cost, and high radiation dose shielding rate Is preferred.

  As a conventionally known radioactive substance storage container, for example, there is a container for storing spent fuel or the like (see, for example, Patent Document 1). However, this storage container stores fuel and the like, has a completely different purpose and required performance, has a complicated structure, and is expensive. Accordingly, there has been a demand for a storage container that can easily store radioactive contaminants.

JP 2011-247701 A

  The present invention has been made based on such problems, and aims to provide a storage container that is easy to handle, easy to transport, excellent in durability, low in price, and high in radiation shielding rate. And

  The storage container of the present invention stores contaminants due to radioactive substances, and includes a container main body made of plastic with a storage portion provided therein and an opening formed in the upper portion, and the opening of the container main body. An inner container having a lid that covers the inner container, and a shield that covers the outer periphery of the side part of the inner container with a space between the inner container and the inner container.

  According to the storage container of the present invention, the inner container having the container body made of plastic and the shielding body covering the outer periphery of the side portion of the inner container with a space between the inner container and the inner container are provided. And the shield can be separated and transported and installed, and handling and transportation can be facilitated. In addition, since the container body is made of plastic, it can be handled and transported more easily, is resistant to snow and rain, can be highly durable, and can be inexpensive. . Furthermore, since the shield is provided outside the inner container, the radiation shielding rate can be increased with a simple structure.

  Moreover, if the shield is made of concrete, a high shielding rate and high durability can be obtained, and if the shield is divided into a plurality in the height direction, it is transported and installed in a divided manner. Therefore, handling and transportation can be made easier.

  Furthermore, if the shield is made of plastic or a plastic composite material to which an inorganic material is added, high durability can be obtained and the weight can be reduced, so that handling and transportation are easy. Can do. In particular, if a corrugated tube having a corrugated shape in the height direction is provided, the strength can be increased, so that a plurality of storage containers can be stacked and stored. If the straight tube is provided inside the corrugated tube, the radiation shielding rate can be increased with a light and simple structure.

  In addition, if the lower end of the shield is closed and a water storage space for water is provided between the shield and the inner container, the radiation shielding rate can be increased with a simple structure, and transportation can be facilitated. It is easy and the price can be reduced.

It is a figure showing the structure of the storage container which concerns on the 1st Embodiment of this invention. It is a figure showing the structure of the storage container which concerns on the 2nd Embodiment of this invention. It is a figure showing the structure of the storage container which concerns on the 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
1A and 1B show a configuration of a storage container 10 according to a first embodiment of the present invention. FIG. 1A is an external view, and FIG. The storage container 10 stores contaminants due to radioactive substances, and is a shield provided to cover the outer periphery of the side of the inner container 11 with a space between the inner container 11 and the inner container 11. 12.

  The inner container 11 includes, for example, a container main body 11A in which a storage unit is provided and an opening is formed in the upper part, and a lid 11B that covers the opening of the container main body 11A. The container body 11A is constituted by a so-called plastic drum made of plastic such as high-density polyethylene, for example. This is because by using plastic, handling and transportation are easy, it is resistant to snow and rain, high durability can be obtained, and the price can be reduced. The lid 11B is also preferably made of plastic, for example.

  The shield 12 is, for example, a cylinder with both ends open and is made of concrete. This is because concrete has a high radiation shielding rate. The shield 12 is divided into a plurality of pieces in the height direction of the inner container 11, for example, and is formed by laminating a plurality of annular bodies 12A. If the annular body 12A divided into a plurality is laminated, even if it is made of heavy concrete, it can be divided and transported and installed, and handling and transportation can be facilitated.

  Each annular body 12A, for example, is provided with a concave step portion 12B on the inner peripheral upper surface and a step portion 12C protruding downward on the inner peripheral lower surface corresponding to the step portion 12B. Yes. This is because the annular body 12A can be quickly and stably laminated beautifully by making the step portion 12B and the step portion 12C correspond to each other.

  For example, it is preferable to place the upper shielding body 13 in which muddy water or the like is put in a bag on the lid 11B of the inner container 11 because leakage of radiation from above can be shielded. .

  In the storage container 10, for example, a plurality of annular bodies 12 </ b> A are stacked on the outside of the inner container 11 and the shielding body 12 is disposed, and a contaminant due to a radioactive substance is placed in the storage portion of the inner container 11 and stored. When transporting the storage container 10, for example, the shielding body 12 is divided into a plurality of annular bodies 12 </ b> A and removed, and the inner container 11 is placed on a truck or the like, and then the shielding body 12 is disposed outside the inner container 11. . Similarly, when unloading from a truck or the like.

  As described above, according to the storage container 10 of the present embodiment, the container body 11A is made of plastic, so that it can be easily handled and transported, is resistant to snow and rain, and has high durability. Can be obtained and the price can be reduced. Moreover, since the inner container 11 having the container main body 11A made of plastic and the shield 12 covering the outer periphery of the side part of the inner container 11 with a space between the inner container 11 are provided, the structure is simple. While the radiation shielding rate can be increased, the inner container 11 and the shield 12 can be transported and installed separately, and handling and transport can be facilitated.

  Furthermore, if the shield 12 is made of concrete, a high shielding rate and high durability can be obtained. In addition, if the shielding body 12 is divided into a plurality of parts in the height direction, it can be divided and transported and installed, so that handling and transportation can be made easier.

(Second Embodiment)
FIG. 2 shows a cross-sectional structure of the storage container 20 according to the second embodiment of the present invention. The storage container 20 has the same configuration as that of the first embodiment except that the specific structure of the storage container 10 and the shield 22 according to the first embodiment is different. Therefore, the same constituent elements are denoted by the same reference numerals and detailed description thereof is omitted, and the corresponding constituent elements are described with reference numerals in which the tens place is changed to “2”.

  The shield 22 has, for example, a cylindrical shape whose both ends are open, and is provided so as to cover the outer periphery of the side portion of the inner container 11 with a space between the shield 22 and the inner container 11. The shield 22 is made of, for example, a plastic composite material in which an inorganic material such as carbon is added to plastic such as high-density polyethylene or plastic such as high-density polyethylene. This is because if the plastic or plastic composite material is used, high durability can be obtained and the weight can be reduced, so that handling and transportation can be facilitated.

  Moreover, it is preferable that the shield 22 has a corrugated tube 22A made of plastic or a plastic composite material in which a wave shape is formed in the height direction of the inner container 11. This is because by forming a wave shape in the height direction, the strength can be increased and a plurality of storage containers 20 can be stacked and stored. It is more preferable to provide a straight tube 22B made of plastic or a plastic composite material inside the corrugated tube 22A. This is because the shield 22 has a double structure, so that the radiation shielding rate can be further increased with a light and simple structure.

  As described above, according to the storage container 20 of the present embodiment, since the shield 22 is made of a plastic composite material to which plastic or an inorganic material is added, high durability can be obtained and the weight can be reduced. Can be handled and transported easily. Moreover, if it has the corrugated pipe | tube 22A in which the waveform was formed in the height direction, intensity | strength can be raised and the several storage container 20 can be piled up and stored. Furthermore, if the straight tube 22B is provided inside the corrugated tube 22A, the radiation shielding rate can be further increased with a light and simple structure.

(Third embodiment)
FIG. 3 shows a cross-sectional structure of a storage container 30 according to the third embodiment of the present invention. The storage container 30 has the same configuration as that of the first embodiment except that the specific structure of the storage container 10 and the shield 32 according to the first embodiment is different. Therefore, the same constituent elements are denoted by the same reference numerals and detailed description thereof is omitted, and the corresponding constituent elements are described with reference numerals in which the tens place is changed to “3”.

  The shield 32 has, for example, a side part 32A that covers the outer periphery of the side part of the inner container 11 with a space between the shield part 32 and a bottom part 32B that closes the lower end of the side part 32A. ing. The upper end portion of the side portion 32A is open, and a water storage space 32C for containing water is formed between the side portion 32A and the inner container 11. The shield 32 is made of plastic or a plastic composite material, for example, as in the second embodiment. Therefore, with a simple structure, by putting water into the water storage space 32C during storage, the radiation shielding rate can be increased, and during transportation, the water can be easily transported without water. . Also, the price can be reduced.

  Regarding the storage container 10 according to the first embodiment, the storage container 20 according to the second embodiment, and the storage container 30 according to the third embodiment, soil contaminated with radioactive materials is stored in the storage unit. The radiation shielding rate at a position 10 cm away from the storage container 10, 20, 30 was examined. The shielding body 12 of the storage container 10 was formed by laminating a plurality of annular bodies 12A made of concrete. The shield 22 of the storage container 20 has a double structure in which a straight tube 22B made of a plastic composite material is provided inside a corrugated tube 22A made of a plastic composite material having a wave shape formed in the height direction. In the storage container 30, the inner container 11 was placed in a shielding body 32 made of plastic having a side portion 32 </ b> A and a bottom portion 32 </ b> B, and water was placed between the inner container 11 and the shielding body 32.

  Further, as a comparative example, the shielding rate of radiation in the case where only the inner container 11 was provided without providing the shielding bodies 12, 22, and 32 was similarly examined. The obtained results are shown in Table 1. The air dose was 0.62 μSv / h at 1 cm above the ground, 0.49 μSv / h at 50 cm above the ground, and 0.46 μSv / h at 1 m above the ground.

  As shown in Table 1, it was found that any of the storage containers 10, 20, and 30 can obtain a high shielding rate for radiation with a simple structure. In particular, in the storage container 10 using the shield 12 made of concrete, a high shielding rate exceeding 90% could be obtained. Moreover, in the storage container 20 using the corrugated pipe 22A and the straight pipe 22B made of a plastic composite material, a sufficiently high shielding rate could be obtained without using heavy concrete. Since the radiation dose decreases as the distance from the radioactive material increases, it has been found that the storage container 20 can be adequately accommodated by installing it at a certain distance from the place of residence. Even in the storage container 30 in which water is put between the plastic shield 32 and the inner container 11, although there is a trouble of putting water, a sufficiently high shielding rate can be obtained as in the case of the storage container 20.

  The present invention has been described with reference to the embodiments and examples. However, the present invention is not limited to the above-described embodiments and examples, and various modifications can be made. For example, in the above-described embodiment, the configuration of the shields 12, 22, and 32 has been specifically described. However, other configurations may be used.

  DESCRIPTION OF SYMBOLS 10,20,30 ... Storage container, 11 ... Inner container, 11A ... Container main body, 11B ... Cover, 12, 22, 32 ... Shielding body, 12A ... Annular body, 12B, 12C ... Stepped part, 22A ... Corrugated tube, 22B ... straight pipe, 32A ... side, 32B ... bottom, 32C ... water storage space

Claims (6)

A storage container for storing contaminants caused by radioactive substances,
A container main body made of plastic having an accommodating portion provided therein and having an opening formed at the top thereof, and an inner container having a lid that covers the opening of the container main body,
A storage container comprising: a shielding body covering the outer periphery of the side part of the inner container with a space between the inner container and the inner container.   The storage container according to claim 1, wherein the shield is made of concrete and is divided into a plurality of parts in a height direction of the inner container.   The storage container according to claim 1, wherein the shield is made of a plastic composite material to which plastic or an inorganic material is added.   The storage container according to claim 3, wherein the shield has a corrugated tube made of plastic or a plastic composite material having a wave shape formed in a height direction of the inner container.   The storage container according to claim 4, wherein the shield has a straight tube made of plastic or a plastic composite material inside the corrugated tube.   The shield has a side part that covers the outer periphery of the side part of the inner container, and a bottom part that closes a lower end of the side part, and has a water storage space for putting water between the inner container. The storage container according to claim 3.

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