JPH0836094A - Closed treatment container for radioactive waste - Google Patents

Abstract

PURPOSE:To store radioactive wastes in order to completely shut out them from the outside, closedly store them to prevent radiation leakage, and carry out discharge and storage treatment while keeping safety. CONSTITUTION:A container main body part 1 which consists of a double-layer container 11 having an inner and outer double-layer structure and consisting of an outer container 12 made of lead and having a bottom and an inner container 13 made of glass and having a bottom, is installed. A circular step part 14 for joining and mounting is formed near the open upper end part on the inner wall face of the inner container 13. A radioactive waste 23 is stored in the container body 11, the open upper end part of the inner container 13 is closed by an inner cover plate 21 made of glass, and the upper side of the plate 21 is filled with a sealing material 24 such as mortar cement, etc., to close the inner container 13. On the upper part of the sealing material 24, the open upper end of the container 11 is closed by an outer cover plate 22 and the periphery of the cover plate 22 is welded with the upper end peripery of the outer container 12 to close these peripheral parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radioactive waste sealed container for containing and sealing radioactive waste for disposal and storage.

[0002]

2. Description of the Related Art Currently, a large amount of radioactive waste is generated from facilities such as nuclear power plants, and the amount of the waste is increasing year by year. It is compulsory to secure the safety of these radioactive wastes and to dispose of them and store them.

At present, for example, liquid radioactive waste is
Diluted to the specified value and discharged to the ocean, and solid radioactive waste is treated, for example, by storing it in a drum and hardening it with concrete.

However, a hermetically sealed processing container which can completely dispose of such radioactive waste while ensuring its safety has not yet been developed.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and it is safe to contain radioactive waste, completely shield it from the outside, and seal it so that there is no radiation leakage. It is an object of the present invention to provide a closed treatment container for radioactive waste that can be secured, disposed of, and stored.

[0006]

In order to achieve the above object, a sealed container for radioactive waste according to the present invention comprises a container body having an open upper end and a lid for closing the open upper end of the container body. Including the body part, the container body is composed of a two-tank container body having an inner and outer two-tank structure with a bottomed lead outer container and a bottomed glass inner container, near the opening upper end of the inner container. An annular engagement mounting step portion is formed on the inner wall surface at a position that is located at a position lower than the upper end of the opening of the inner container by an appropriate size, and the lid portion is used for the engagement mounting portion. It has an inner lid plate made of glass that is engaged and mounted on a step portion, and an outer lid body made of lead that is placed on the upper end of the opening of the container body portion, and the inner lid plate is the step portion for engaging and mounting. And the upper end of the opening of the inner container is closed, and the inner container on the upper side of the inner lid plate is engaged. The inner lid is filled with a sealing material to seal the upper end of the opening, the outer lid plate is placed on the upper end of the opening of the two-tank container body, and the upper end of the opening is closed, and the outer lid plate is placed. The outer edge of the outer container is welded to the upper edge of the outer container to seal the portion.

[0007]

The upper end of the opening of the glass inner container is sealed by the glass inner lid plate and the sealing material, and the periphery of the lead outer lid plate that closes the upper end of the opening of the two-tank container body is made of lead outer. Since the upper edge of the container is welded and hermetically sealed, radioactive waste is completely shielded from the outside and stored in the two-tank container body. Further, since the outer container and the outer lid are made of lead, it prevents the radioactivity from leaking out of the container. Furthermore, since the inner container and the inner lid plate are made of glass, rust is prevented from being generated inside the two-tank container body. In this case, if rust is generated inside the container body, it will cause radioactive leakage.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view showing an embodiment of a closed treatment container for radioactive waste according to the present invention, FIG. 2 is a vertical cross-sectional view of a container body of the above closed treatment container, and FIG. A vertical cross-sectional view showing a state in which the upper end of the opening is closed,
FIG. 4 is an explanatory view showing an example of the method for manufacturing the container body of the above.

1 to 4, the closed container for radioactive waste according to this embodiment has a container body 1 having an opening O at the upper end, and a lid portion for closing the opening upper end of the container body 1. 2 and.

The container body 1 comprises a leaded outer container 12 having a bottom.
And the bottomed inner glass container 13 constitute a cylindrical two-vessel container body 11 having an inner and outer two-vessel structure. The size of the two-tank container body 11 is arbitrarily set, and for example, the diameter is about 50 to 100 cm and the height is about 80 to 150.
It can be formed to about cm.

The upper end 12A of the outer container 12 and the upper end 13A of the inner container 13 are flush with each other. Both containers 12
The thickness of each of the inner container 13 and the outer container 12 is not particularly limited, but in consideration of the strength and the function of preventing radioactive leakage, for example, the inner container 13 is about 5 to 25 mm, and the outer container 12 is
Can be set to about 3 to 10 mm. Also, the inner container 1
It is preferable that 3 is made of heat-resistant glass.

On the inner wall surface near the upper end of the opening of the inner container 13, an annular engaging and mounting step 14 is provided.
It is formed at a position located on the lower side by an appropriate size from A. The step portion 14 engages and mounts a glass inner lid plate described later to close the opening upper end portion of the inner container 13, and at the opening upper end portion of the inner container 13, a sealing material having the inner lid plate as a bottom plate. The filling chamber 15 is formed, and the filling chamber 15 is filled with a sealing material 24, which will be described later, to completely seal the opening upper end portion of the inner container 13.
The dimension from 3A to the step portion 14 is, for example, 10 to 20c.
It can be set to about m. 16 is a bottom plate of the outer container 12, 17
Is the bottom plate of the inner container 13.

The lid portion 2 is an inner lid plate 21 made of glass that is engaged with the engagement mounting step portion 14 to close the opening upper end portion of the inner container 13, and the opening of the container body 1. An outer lid plate 22 made of lead placed on the upper end of O to close the upper end of the opening O. The thickness of the both lid plates 21 and 22 is appropriately set, and the outer diameter of the outer lid plate 22 is the upper end 12 of the outer container 12.
The outer diameter of A is matched.

The hermetically-sealed processing container of this embodiment has the above-mentioned structure, the radioactive waste 23 (solid, liquid and a mixture of both) is contained in the two-tank container body 11, and the upper end of the opening of the inner container 13 is After the lid is closed with the inner lid plate 21, the inside of the inner container 13 on the upper side of the lid plate 21, that is, the filling chamber 15 having the lid plate 21 as the bottom plate is filled with the sealing material 24 and the container 1
The upper end of the opening of No. 3 is sealed, and the two-tank container 11
The outer lid plate 22 is placed on the upper end of the opening to close the lid. Next, the peripheral edge of the outer lid plate 22 is welded 25 to the peripheral edge of the upper end of the outer container 12 to seal the portion. As the sealing material 24, for example, mortar cement, ready-mixed concrete or the like can be adopted.

Next, an example of a method for manufacturing the container body 1 will be described with reference to FIG. In the figure, 31 indicates a mold, 32 indicates molten lead, and the mold 31 is composed of a split mold or the like, and the size inside the mold 31 matches the outer size of the outer container 12. In the manufacturing method shown in the drawing, the mold 31 is an outer mold, and the inner container 13 is a medium mold, so that the two-tank container body 11 is formed.
A desired number of inner containers 13 manufactured by an arbitrary method are prepared and preheated to a temperature similar to that of molten lead.

Therefore, as shown in FIG. A, an appropriate amount of molten lead 3 (amount corresponding to the constituent amount of the outer container 13) is placed in the mold 31.
2 is poured, and the inner container 13 hung by a crane (not shown) or the like in the mold 31 is concentric with the mold 31 at a predetermined position, that is, the outer container 1 is placed on the bottom surface of the mold 31.
The second bottom plate 16 is lowered and fitted into a position where a thickness interval is formed. Through this step, as shown in FIG.
The molten lead 32 inside rises in the gap 33 formed between the outer peripheral surface of the inner container 13 and the inner peripheral surface of the mold 31, and at the end point of descent, as shown in FIG. The entire outer surface is covered with molten lead 32, and the lead outer container 12 is integrally formed on the outer side of the inner container 13. Next, this is cooled and taken out from the mold 31 to form a two-tank container body having an inner and outer two-tank structure with a bottomed lead outer container 12 and a bottomed glass inner container 13, as shown in FIG. 11 are manufactured.

FIG. 4 shows an example of a method of manufacturing the container body 1, and any manufacturing method other than this can be freely adopted.

[0018]

Industrial Applicability According to the present invention, radioactive waste is contained, completely shielded from the outside, and hermetically sealed so that there is no leakage of radioactivity. Will be possible.

[Brief description of drawings]

FIG. 1 shows a closed treatment container 1 for radioactive waste according to the present invention.
It is a longitudinal section showing an example.

FIG. 2 is a vertical cross-sectional view of a container body of the above closed processing container.

FIG. 3 is a vertical cross-sectional view showing a state in which the upper end of the opening of the inner container of the same container body is closed.

FIG. 4 is an explanatory view showing an example of a method for manufacturing the same container body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container main body 11 Two tank container body 12 Outer container 13 Inner container 14 Engagement mounting step 21 Inner lid plate 22 Outer lid plate 23 Radioactive waste 24 Sealing material 25 Welding

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location G21F 9/36 501 F

Claims (1)

[Claims] 1. A container main body having an open upper end and a lid body closing the open upper end of the container main body, wherein the container main body is made of a leaded outer container with a bottom and a glass with a bottom. An inner container and a two-tank container body having an inner and outer two-vessel structure, and an annular engaging mounting step is more suitable than the upper end of the opening of the inner container on the inner wall surface near the upper end of the opening of the inner container. It is formed in a place located only on the lower side by the dimension, and the lid part is
An inner lid plate made of glass that is engaged and placed on the engaging mounting step and an outer lid body made of lead that is placed on the upper end of the opening of the container body are provided, and the inner lid plate is the engaging member. The upper end of the opening of the inner container is closed by engaging and mounting on the step part for mounting and loading, and the sealing material is filled in the inner container on the upper side of the inner lid plate to open the upper end of the inner container. The outer lid plate is placed on the upper end of the opening of the two-tank container body to close the upper end of the opening, and the peripheral edge of the outer cover plate is welded to the upper peripheral edge of the outer container. A closed treatment container for radioactive waste, characterized in that it is constructed so as to close the portion.