JP3193017U - Storage and transfer system for radioactive material containment - Google Patents

Abstract

The present invention provides a storage and transport system for a radioactive substance containment storage body using a storage body for storing waste containing radioactive substances for a long period of time.
A water-tight sealed package 2a, 2b, 2c, 2d for sealing a storage waste containing a radioactive substance, a cylindrical tube 3 and an adsorbent for adsorbing the radioactive substance are used. This is a storage body 30 having a structure in which adsorbents are filled in the side portions and the upper and lower portions between the packing bodies 2a, 2b, 2c, 2d and the cylindrical tubular body 3. Further, a water-tight sealed package that is disposed in the cylindrical tube body 3 according to the waste, the storage location, and the transfer form, depending on the specific gravity of the waste, the form of the storage place, or the portability at the time of movement. A system is provided in which the number of 2a, 2b, 2c, 2d and the cylindrical tube body 3 are determined to select the storage body 30.
[Selection] Figure 5

Description

  The present invention relates to a container for storing radioactive contaminants including radioactive substances such as radioactive cesium for a long period of time, and an article storage and transfer system using the same.

  For example, radioactive materials having a long half-life of about 30 years, such as cesium 137, require long-term storage management. For soil, forests, and water contaminated with radioactive materials, the problem is how to preserve and manage the shaved top soil, collected sludge, incinerated ash, and contaminated water for a long time without any external impact. Moreover, such radioactive materials make this problem more difficult because long-term storage cannot be limited to specific areas. Therefore, the idea of temporary storage and intermediate storage is required. In other words, there is a social need to provide storage means that can be moved while preventing radioactive leakage of waste containing radioactive materials.

  According to a conventionally well-known technique, for example, a means (Patent Document 1) for covering with concrete that is advantageous for long-term storage becomes a general idea. However, this is an effective means when the movement is not considered, but it is not necessarily an appropriate means in consideration of transportability. Therefore, in Patent Document 2, the drum can forming the radioactive waste storage unit and the concrete covering layer covering the outer surface of the side peripheral portion and the bottom portion of the drum can are tried to make it a little lighter. Such iron drums have the disadvantage of corroding.

  Moreover, when the container is made of such steel drums, concrete having a specific gravity of 2.3 to 2.6, or reinforced concrete having a specific gravity of 2.4 to 2.8, etc., in order to reduce the external release of radioactivity. Since it is necessary to thicken the wall, the concrete container with a large total weight is obtained. Therefore, when a radioactive material is accommodated and transported to another place, it is transported by a large transport vehicle, and the social cost is high. Here, improvement of transportability cannot be expected even if sand is mixed with gravel with a specific gravity of 1.9 and soft rock with 2.1 to 2.6 instead of concrete. Further, considering only the weight, wood having a specific gravity of 0.4 to 0.9 can be considered, but it is difficult to shield the radioactive material and is not practical.

  An example is disclosed in Patent Document 3 as a means for transporting waste containing a radioactive substance while paying attention to transportability and considering shielding of the radioactive substance. This means has an effect of reducing the exposure dose received by the transport worker by providing an outer filling portion for filling the low concentration contaminant around the high concentration contaminant container.

  Even such a technique disclosed in Patent Document 3 is easy to transport and can be further disposed of, and more importantly, a technique for further reducing the exposure dose of workers is required. .

JP2013-76659A (especially FIGS. 1-5 etc.) JP2013-195091 (particularly FIG. 1 etc.) JP 2014-25790 (particularly FIG. 4 etc.) Japanese Patent No. 3623718

  As described above, a concrete container effective as a shield increases the weight of the entire container relative to the amount of radioactive contaminants stored. Therefore, even if radioactive contaminants can be stored, they are not suitable for transporting containers. Therefore, there is a need for a transport / storage container that is suitable for both transport and storage of radioactive contaminants and that can further reduce the exposure dose of workers.

  Waste containing radioactive materials is filled in a predetermined container and is first transported to a “stack”. After that, it is transported to the “temporary storage site” (about 3 years), then transported to the “intermediate storage facility” (about 30 years) and finally moved to the “permanent disposal site” and stored at the storage site. There is also a need to provide suitable means for incineration of waste containing sufficiently reduced radioactivity.

  The present invention has been made to solve the problems in view of the above-described viewpoints. In order to achieve the above-mentioned object, it is easy to determine a suitable storage form for each storage point, and to provide a lightweight storage body that cannot be a concrete storage body of the prior art. It is a system that can easily determine the form to prevent.

  Therefore, the storage body used in the present invention is a watertight sealed package using a watertight sealed package that seals stored waste containing radioactive materials, a cylindrical tube, and a radioactive material adsorbent. A structure in which an adsorbent is filled between the cylindrical tube body is adopted.

  Here, the water-tight sealed package is a fixed size, but the number of water-tight sealed packages sealed in the cylindrical tube, the size of the cylindrical tube, etc. can be selected from a predetermined size, Provision of a storage structure with a structure that can be selected as required, such as a temporary storage area of about 3 years, a storage form in an intermediate storage facility that requires 30 years of storage, or an appropriate size during transportation, and By systematizing the storage and transfer, the present invention provides an appropriate management means for waste containing radioactive materials.

  As described above, the present invention stores the wastes containing radioactive substances when they are stored at a collection site, a temporary storage site, an intermediate storage facility, a permanent disposal site, and transferred between the storage points. In a storage and transfer system for radioactive substance containment storage bodies, a water-tight sealed package for packing the waste containing the radioactive substance and a number of the water-tight sealed packages for selection of at least four and a maximum of four are stored. A cylindrical tube body, a periphery of the bottom of the cylindrical tube and the periphery of the water-tight sealed package, and the cylindrical tube and the water-tight sealed package within the upper lid of the cylindrical tube. And a radioactive substance adsorbent that fills a gap between the storage body, at least one of the collection site, the temporary storage site, the intermediate storage facility, and the permanent disposal site, and When transporting to or between those locations Providing storage and transfer system of radioactive material containment housing body, characterized in that waste containment containing the radioactive material in the container.

  The radioactive substance containment storage and transport system of the present invention has the following effects. In other words, the present invention using the structure of the waste containing radioactive material is suitable for the “collection site”, “temporary storage site”, “intermediate storage facility”, and “permanent disposal site” at each storage point. In addition, it is possible to select a form that prevents radioactive exposure to workers when transferring and storing them between each point of storage, so it is safe and easy to store and transfer waste containing radioactive materials. Can provide a system.

It is a permeation | transmission perspective view which shows the radioactive substance containment storage body of 1st Example of this invention. It is the permeation | transmission top view seen from the upper direction of 1st Example of this invention shown in FIG. It is a permeation | transmission perspective view of the storage body which is 2nd Example of this invention. It is a permeation | transmission perspective view of the storage body which is 3rd Example of this invention. It is a permeation | transmission perspective view of the storage body which is 4th Example of this invention.

  Hereinafter, the radioactive substance containment container of the present invention will be described in detail with reference to the drawings. FIG. 1 and FIG. 2 are a transparent perspective view showing the overall structure of the storage body of the first embodiment of the present invention and a transparent top view seen from above. FIG. 3 is a transparent perspective view showing the second embodiment, and FIGS. 4 and 5 are transparent perspective views showing the third and fourth embodiments, respectively.

(First embodiment)
The storage body (1) of the first embodiment shown in FIG. 1 and FIG. 2 includes soil containing radioactive material such as cesium, humus, sludge, tree branches and leaves thereof, incinerated ash, or concentrated water containing high-concentration radioactive material. A radioactive material such as cesium placed on the bottom (4) of the cylindrical tube (3) with a water-tight sealed package (2) that can also be configured to shut off radioactive materials and block residues. It is placed on the adsorbing radioactive material adsorbing material (5a, 5b, 5c, 5d, 5e, 5f, etc.), and between the water-tight sealed package (2) and the cylindrical tube (3), The gap (6) is further filled with a radioactive substance adsorbing material (5a, 5b, 5c, 5d, 5e, 5f, etc.) that adsorbs a radioactive substance such as cesium indicated by an asterisk in FIG. Then, after this adsorbent is mounted on the water-tight sealed package (2), the upper part of the cylindrical tube (3) is sealed with a lid (7).

  The water-tight sealed package (2) preferably has a triple structure, for example, a polyethylene (PE) material with a liner and a waterproof processing, a diameter of 1080 mm and a height (height) of 2000 mm. Inner bag, polyethylene (PE) material of water-impervious material, medium bag of 1090 mm in diameter and 2000 mm length (height), and polypropylene (PP) material of UV durable sheet, 1100 mm in diameter and 1100 mm length ( The height of the outer bag can be a triple structure. Further, for example, when a polypropylene belt is formed of a polyethylene terephthalate (PET) sewing thread and a nylon 66 binding band (not shown) that can be lifted and lifted, the water-tight sealed package (2) is cylindrical. When the tube (3) is stored or taken out from the cylindrical tube (3), a forklift, a crane, or the like can be easily used. This waterproof and sealed package (2) can tolerate a weight of the contents to be sealed up to about 1 ton. In the figure, the upper portion of the water-tight sealed package (2) (the entrance and exit for radioactive waste) is shown in a state before sealing.

  The cylindrical tubular body (3) is made of a high-density polyethylene resin having an outer diameter of 1300 mm or more, for example, having an inner diameter of a circular cylinder having an inner diameter of 1200 mm or more and a reinforcing hollow rib provided on the outer side in an annular shape, and has a total length of 800 mm to 5000 mm. It can be. Specifically, a pressure-resistant polyethylene rib tube defined by Japanese Industrial Standard (JIS K 6780) can be used. The nominal diameter that determines the size of the inner diameter can be selected up to 3000 mm with various nominal diameters such as 1200 mm, 1350 mm, 1500 mm, and 1650 mm. This industrial standard product is recommended by the New Technology Registered Calvert Engineering and Flexible Construction Pipe of the Ministry of Land, Infrastructure, Transport and Tourism, and also recommended by the Ministry of Agriculture, Forestry and Fisheries of the Land Improvement Project Planning Design Standard and the Japan Road Authority Design Guidelines Vol. 2 It is also approved by public institutions and has a long service life and is economical. Furthermore, since the cylindrical tubular body (3) can avoid air bubbles generated in, for example, concrete, the radioactivity can be further blocked.

  The cylindrical tubular body (3) uses a pressure-resistant polyethylene rib pipe having a cylindrical inner diameter and a structure in which reinforcing ribs are provided on the outside. However, there is no need to be particular about this shape. It may be a tube structure having a substantially constant wall cross-sectional shape in the direction.

  The bottom (4) of the cylindrical tube (3) is preferably fitted with a polyethylene decontamination sheet (not shown). The joining of the bottom (4) and the wall of the cylindrical tube (3) is performed by energizing a heating wire to heat the polyethylene connection portion, and the sheet constituting the wall and the bottom of the cylindrical tube (3) The melt is welded. Since the joint portion between the bottom (4) and the wall (9) of the cylindrical tube (3) is fusion welded, the container has a sealing property and a water tightness.

  By the way, the sheet used in the cylindrical tube (3) and the bottom (4) is lighter by about one-tenth than the concrete. In addition, it is highly resistant to chemical resistance and salt damage against hydrogen sulfide, sulfuric acid, ammonia, etc., and the pressure-resistant polyethylene rib pipe defined by Japanese Industrial Standards is also excellent in earthquake resistance due to its structure. That is, it is a container that can be stored for a long period of time.

  In order to preserve soil, sludge and their incinerated ash, or radioactive polluted water for a long period of time, which is a stored waste containing radioactive elements such as cesium, a water-tight sealed package (2) so that radiation prevents external exposure And a cylindrical tube (3) are filled with a radioactive material adsorbent.

  Place it on the bottom (4) of the cylindrical tube (3) and place it next to the water-tight sealed package (2) as shown by the stars (5a, 5b, 5c, 5d, 5e, 5f, etc.) in FIG. The radioactive material adsorbent that adsorbs radioactive substances such as cesium placed thereon is preferably a natural adsorbent. As a natural adsorbent, at least one kind of zeolite (zeolite), bentonite, diatomaceous earth, clayey soil, fly ash (coal ash), activated carbon, volcanic ash and the like can be blended and used as necessary.

  This radioactive material adsorbent (5a, 5b, 5c, 5d, 5e, 5f, etc.) is not only convenient for transportation if it is packed in a desired composition in advance when these materials are used in combination. When filling the adsorbent and the cylindrical tube (3), it can be taken out of the bag and filled as it is, which is convenient because it does not have to be blended on site.

  The adsorbent that adsorbs the radioactive substance can be replaced with materials other than those described above. For example, a lightweight porous concrete material for greening (see Japanese Patent No. 3623718) in which wood powder or bamboo material is mixed with cement in diatomaceous earth may be used. In that case, it is also possible to mix the material with cement and pour it with an adsorbing element.

  A radioactive substance adsorbing material is also placed on the watertight sealed package (2) in the cylindrical tube (3), and the watertight sealed package (2) is covered with the radioactive substance adsorbing material. Then, the upper lid (7) is sealed with a cylindrical tube (3) and a rubber gasket, or sealed by fusion welding in the same manner as the bottom (4). Thus, according to the cylindrical tube body (3) of the present invention, it is also advantageous that sealing is easy.

  The water-impervious hermetically sealed package (2), the adsorbent (5a, 5b, 5c, 5d, 5e, 5f, etc.) and the cylindrical tube (3) can contain the radioactive material in a triple manner.

(Second embodiment)
FIG. 3 shows a second embodiment (10) in which a water-tight sealed package (2a, 2b) packed with storage waste containing radioactive material is set up in a cylindrical tube (3). Shows the stacked state. It is possible to select whether to use the one-stage water-tight sealed package (2) shown in FIG.

(Third embodiment / fourth embodiment)
FIGS. 4 and 5 show the third and fourth embodiments (20, 30), in which three or four water-tight sealed packages (2a, 2b, 2c) are stacked in a cylindrical tube (3). It is a thing. The third and fourth embodiments are suitable for storing stored waste in an intermediate storage facility. When the storage body of the first embodiment or the second embodiment is transferred from, for example, a temporary storage site to an intermediate storage facility, it can be stored vertically as it is. The storage body of the first embodiment or the second embodiment can be switched to that of the third embodiment or the fourth embodiment according to the necessity of increase / decrease or replacement of the adsorbent. Switching from the first embodiment or the second embodiment to the third embodiment or the fourth embodiment is because the water-tight sealed package (2) has a constant size and almost the same weight. Replacement is possible in accordance with the selected cylindrical tube (3). If necessary, the cylindrical tubes (3) can be joined together on site. The reason why the four-layer stacking is maximized is that the weight and size of the entire body including the cylindrical tube (3) and the adsorbent (5a, 5b, 5c, 5d, 5e, 5f, etc.), transportation and This is a result of considering the installation work.

  The size of the cylindrical tubular body (3) can be selected as necessary for the water-tight sealed package (2) of a predetermined size. For example, when the impermeable sealed package (2) packed with radioactive waste is first transported to a collection site, or when waste is high in specific gravity with a lot of stone and moisture, emphasis is placed on ease of transport. In the form shown in At that time, in the case of a waste having a low specific gravity such as wood, the configuration shown in FIG. Further, in such a case where the specific gravity is light, etc., a four-piece watertight sealed package as shown in FIG. 5 may be used.

  Then, as a storage management form, in the “temporary storage place” of about 3 years, the water-tight sealed package (2) is increased from the viewpoint of effective use of land as shown in FIG. Furthermore, the “intermediate storage facility” can be changed to the form shown in FIG. 5 in order to improve land use.

  Since the cylindrical tube (3) is made of polyethylene, it can be incinerated at a combustion temperature of 350 to 450 ° C. Therefore, since the cesium becomes semi-destructive if it is stored for about 30 years in the “intermediate storage facility”, the cylindrical tube (3) is incinerated together with the water-tight sealed package (2) to reduce the volume. The final waste can be transferred to a “permanent disposal site”.

  Use a cylindrical tube (3) with a large diameter that can increase the number of radioactive material adsorbents (5a, 5b, 5c, 5d, 5e, 5f, etc.) in order to prevent workers from being exposed to radioactive rays. It is also possible to do.

  The cylindrical tube (3) has room for a shape other than the cylindrical shape, and for example, it may be a rectangular parallelepiped. In addition, there is room for the watertight sealed package (2) to have a shape other than the circular cylindrical shape, and for example, a rectangular parallelepiped may be considered.

  According to the present invention, it is possible to provide a container suitable for “collection site”, “temporary storage site”, “intermediate storage facility”, and “permanent disposal site” at each point of storage of waste containing radioactive materials. . In addition, it is possible to select a form that prevents radioactive exposure to workers during their accumulation and transfer between storage points, so a system for safe and easy storage and transfer of waste containing radioactive materials is provided. it can. For this reason, it is possible to dramatically improve the processing and storage work of waste containing radioactive materials, which has been regarded as an important issue so far. Therefore, the industrial applicability of the present invention is extremely high.

1, 10, 20, 30 Storage body 2, 2a, 2b, 2c Water-tight sealed package 3 Cylindrical tube body 4 Bottom portions 5a, 5b, 5c, 5d, 5e, 5f of the cylindrical tube body Radioactive substance adsorbing material 6 Gap 7 Lid 9 Wall

Claims (1)

Storage of radioactive material-contained containers for storing wastes containing radioactive materials when storing wastes in collection sites, temporary storage sites, intermediate storage facilities, permanent disposal sites, and transporting them between each storage point In the transfer system,
A water-tight sealed package for packing the waste containing the radioactive material;
A cylindrical tubular body for selecting and storing at least one of the above-mentioned water-tight sealed packages at a maximum of 4;
Radiation filling the gap between the cylindrical tube and the water-tight sealed package in the bottom of the cylindrical tube and the periphery of the water-tight sealed package and in the upper lid of the cylindrical tube A material adsorbent,
A storage body with
At least one of the collection site, the temporary storage site, the intermediate storage facility, and the permanent disposal site, and at the time of transfer to or between the one or more, the radioactive material in the container A storage and transfer system for a radioactive substance containment container, which contains a waste containing a substance.

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