KR101046449B1 - Radioactive Waste Packaging Container - Google Patents

Abstract

Disclosed is a radioactive waste packaging container capable of simultaneously repackaging and containing a plurality of reservoirs for storing radioactive waste. The radioactive waste packaging container according to the present invention includes a packaging container body having a plurality of reservoirs in which radioactive wastes are stored and provided with an entrance through which the reservoir is inserted, a sealed portion of bentonite material for sealing between the package container body and the reservoir; It includes a cover member for sealing the entrance and exit of the packaging container body. Here, the sealing part includes a plurality of sealing blocks having a shape corresponding to the storage body. According to this configuration, it is possible to simultaneously repackage a plurality of reservoirs in which various kinds of radioactive waste are stored without separate treatment processes.

Radioactive, waste, nuclear, medium and low levels, pavement, bentonite, concrete.

Description

Radioactive Waste Packaging Containers {RADIOACTIVE WASTE PACKING CONTAINER}

The present invention relates to a radioactive waste packaging container, and more particularly, to a radioactive waste packaging container for repackaging ineligible waste that does not meet the "medium and low level waste delivery criteria".

The low and medium potential wastes generated during the power generation process of a nuclear power plant are converted to solid form after a predetermined treatment, and then packaged in approximately 200 L of iron-packed drums and temporarily stored in the power plant site. Here, the medium and low level wastes are relatively low in radioactivity and refer to radioactive wastes as defined in Article 2, Paragraph 1 of the Enforcement Decree of the Atomic Energy Act.

However, in the packaging container for temporarily storing the low and medium level waste, problems such as generation of free water due to long-term storage, corrosion of the container, and deterioration of the solid matter are caused. Due to the factors of these containers, wastes that are difficult to meet the "low and medium level waste delivery criteria" that define the conditions of disposable wastes are generated, and special wastes such as dehydrated waste resins and waste filters exist.

Packaging containers containing waste that is ineligible for such "low and medium level waste delivery criteria" should be treated using different treatment methods according to the characteristics of each waste received. As a result, the processing process of the packaging container is complicated, causing a problem that takes time and cost.

In some cases, it may not be possible to process ineligible packaging containers using existing low and medium level waste treatment facilities. Corresponding to this case, instead of separately reprocessing the ineligible packaging, a method of repackaging the high integrity container (HIC) is generally employed. However, the high-health container is expensive, and research / development is required for an inexpensive repackaging method that can replace it.

The present invention has been made in view of the above-described problems, and is to provide a radioactive waste packaging container capable of simultaneously repackaging a plurality of reservoirs in which various kinds of radioactive wastes are stored without a separate treatment process.

Another object of the present invention is to provide a radioactive waste packaging container capable of maintaining a sealing force even after long-term storage of radioactive waste.

The radioactive waste packaging container for achieving the above object, a plurality of reservoirs for storing the radioactive waste is accommodated, the packaging container body is provided with an entrance for the storage is inserted, sealing the gap between the packaging container body and the reservoir. Bentonite seal and the cover member for sealing the entrance and exit of the packaging container body.

According to the present invention, the sealing part includes at least one first sealing block sealing the front end and the rear end of the storage body based on the insertion direction of the storage body to the packaging container body, and the insertion of the storage body to the packaging container body. At least one second sealing block for sealing the side of the reservoir relative to the direction.

Here, the second hermetic block is provided in a shape corresponding to the outer surface of the storage body and has a support groove for supporting the storage body, and is provided in pair to face each other with one storage body therebetween. .

On the other hand, the cover member comprises a stepped insertion portion to be inserted into the entrance and the predetermined depth of the packaging container body, it is coupled to the packaging container body by a fastening means.

In addition, the packaging container body is formed of a concrete material, the dry density of the bentonite sealed blocks is more than 1.2Mg / ㎥.

According to another aspect of the present invention, a radioactive waste packaging container includes a plurality of first containers in which radioactive wastes are stored, a sealing part including a plurality of sealing blocks of bentonite material compression-molded to enclose and seal the first container; It includes a second container of a concrete material for wrapping and sealing the closure.

Here, the sealing unit has at least one first sealing block for sealing the lower end of the first container, the support groove for wrapping and supporting the side of the first container, in a pair with the first container therebetween At least one second sealing block is provided, and at least one third sealing block for sealing the upper end of the first container.

In addition, the second container is formed in the accommodating space for accommodating the first container and the sealing portion therein, a rectangular having an opening having one side open so that the first container and the sealing portion can be inserted into the receiving space. And a cover member inserted into the doorway of the body to a predetermined depth to close the doorway, and a cover member fastened and fixed to the body by screws.

According to the present invention having the configuration as described above, first, by sealing the container and the container using a sealed block formed of bentonite, various kinds of radioactive waste is repacked in one packaging container having an engineering barrier called a sealed block. You can do it. This makes it easier to treat radioactive waste by not having to individually reprocess waste that does not meet the low and medium level waste delivery regulations.

Second, it is possible to repackage wastes that fall short of the low and medium level waste delivery regulations without the use of high-performance containers, which are generally used in the prior art, so that radioactive waste treatment is more economical.

Third, since the sealing block for sealing between the container body and the reservoir is formed of bentonite, it can be configured as an integral order wall that completely seals the gap between the sealing blocks by the characteristic of the swellable bentonite. In addition, the high swelling properties of the bentonite, even if the free water or radioactive material leaks from the reservoir can be absorbed by the bentonite around the reservoir to prevent leakage out of the packaging. Therefore, safety can be ensured even in long-term use.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

Referring to Figure 1, the radioactive waste packaging container 1 according to an embodiment of the present invention includes a body 10, the cover member 20 and the sealing portion 30.

The body 10 accommodates a plurality of storage body S in which radioactive waste is stored, and an entrance 11 for accessing the storage body S is formed thereon. Here, the body 10 is a rectangular hollow inside, it is formed of concrete. This rectangular concrete body 10 contributes to improved work efficiency due to the ease of handling, transport and loading in the disposal site.

The storage body S accommodated in the body 10 is an iron packing drum of approximately 200 liters. In addition, the radioactive waste stored in the storage body (S) can be disposed of due to problems such as generation of free water, container corrosion, deterioration of the solidified body, among the medium and low level waste packaging containers currently being temporarily stored at the nuclear power plant. Special wastes, such as wastes and dehydrated waste resins and waste filters, which are difficult to meet the "Low-Level Waste Management Regulations" that define the conditions for wastes.

The cover member 20 is installed in the open doorway 11 of the body 10 to selectively open and close the inside of the body 10. As shown in FIGS. 1 to 3, the cover member 20 includes an insertion portion 21 protruding stepwise to be introduced into the entrance 11 of the body 10 by a predetermined depth. Therefore, the cover member 20 is excellent in the coupling force and the sealing force to the body 10.

For reference, the cover member 20 is fixed to the entrance 11 of the body 10 by a bolt (B). However, it is obvious that the cover member 20 may be modified by any one of various fastening means other than the bolt B, or modified by welding.

By the above configuration, the storage body S corresponds to the first container for primary sealing the radioactive waste, and the body 10 and the cover member 20 are made of secondary sealing the radioactive waste. It corresponds to two containers. The packaging container 1 for packaging radioactive waste is disposed of in the low and medium level waste disposal site.

The seal 30 seals between the body 10 and the reservoir S, and is formed by compression of bentonite. Here, bentonite forming the sealing part 30 is a mineral that has been changed to the most stable state chemically and radiologically through various mineral altering processes for many millions of years. The bentonite is excellent in the ability to adsorb water and radioactive material, so that the long-term performance can be maintained even in an environment in which radioactive material leaking from the storage body S or groundwater flowing through the strata where the packaging container 1 is disposed is interfered with. Can be. For reference, in this embodiment, the dry density of bentonite forming the sealing part 30 is exemplified as 1.2 Mg / m 3 or more.

As described above, the sealing part 30 formed of bentonite is stored based on the insertion direction of the storage body S inserted into the doorway 11 of the body 10, as shown in FIGS. 1 to 3. It includes the first to third sealing blocks 31, 32, 33 corresponding to the lower end (S1), side surface (S2) and the upper end (S3) of the sieve (S), respectively.

The first sealing block 31 seals the lower end S1 of the storage body S, between the bottom surface 12 of the body 10 and the lower end S1 of the storage body S. Is installed. Here, the first sealing block 31 has a shape corresponding to the bottom surface 12 of the body 10, the bottom surface 12 of the body 10 and the lower end of the storage (S) ( An empty space is not formed between S1).

The first sealing block 31 may be configured as a single having a size corresponding to the lower end (S1), as shown in Figure 2, is divided into four is installed in consideration of the production efficiency during compression molding desirable.

The second sealing block 32 is in contact with the side (S2) of the reservoir (S), and seals it. Specifically, as shown in FIGS. 3 and 4, the second sealing block 32 has no empty space formed between the inner surface 13 of the body 10 and the side surface S2 of the storage body S. To be installed. In addition, as shown in FIGS. 2 to 4, the second sealing block 32 is composed of a pair facing each other with one storage body S interposed therebetween and stacked in multiple layers.

At this time, the second sealing block 32 is formed with a support groove 34 corresponding to the shape of the side surface (S2) of the storage (S). For reference, in the present exemplary embodiment, the storage body S is illustrated as having a cylindrical shape, and correspondingly, the supporting groove 34 formed in the second sealing block 32 has an introduced hemispherical shape. Therefore, when the pair of second sealing blocks 32 face each other, a predetermined hole through which the storage body S can be inserted is formed by the support groove 34 therebetween.

For reference, in order to manufacture the pair of second sealed blocks 32 in one piece, a high compression force is required and production efficiency is low. Thus, the body 10 may be manufactured as a block having a thickness of about 10 cm to 15 cm. ) A plurality of blocks are stacked and installed inside.

In addition, in the present embodiment, as shown in FIG. 4, it is illustrated that there are four storage bodies S accommodated in the interior of the body 10, whereby the second sealing block 32 has four Four pairs are provided so that the side surface S2 of the storage body S may be sealed, respectively.

As shown in FIGS. 1 and 2, the third sealing block 33 seals between the upper end S3 of the storage body S and the cover member 20. The third hermetic block 33 has the same shape as the first hermetic block 31. In addition, the third sealing block 33 has a thickness corresponding to the separation height between the upper end S3 of the storage body S and the cover member 20, so that an empty space is not formed. It is more preferable in terms of manufacturing efficiency that the third sealing block 33 is configured to be divided into four like the first sealing block 31.

On the other hand, the first to third sealing blocks 31, 32, 33 are in a state in which the storage body (S) is sealed, groundwater inflow due to the crack of the concrete body 10 or from the storage body (S) Even if the radioactive material leaks, the gap between the sealing blocks 31, 32 and 33 and the second sealing blocks 32 stacked in multiple layers are completely sealed by the self-expansion and absorbency characteristic of bentonite. . As a result, the first to third sealing blocks 31, 32, 33 become integral barriers, that is, engineered barriers.

The packaging sequence of the radioactive waste packaging container 1 according to the present invention having the above configuration will be described with reference to FIGS. 1 to 4.

1 to 3, when the entrance 11 of the body 10 is in an open state, the first sealing block 31 is laminated on the bottom surface 12 of the body 10. . Thereafter, the pair of second sealing blocks 32 constituted by the pair are inserted into the body 10 while facing each other with the support grooves 34 interposed therebetween. At this time, the second sealing block 32 is made of a block having a thickness of approximately 10 to 15cm, is installed by stacking a plurality of inside the body (10). Then, the storage body S is inserted into a circular space formed by the support groove 34 of the second sealing block 32. Therefore, the side surface S2 of the storage body S is sealed by the second sealing block 32, and the lower end S1 of the storage body S is closed by the first sealing block 31. It is sealed.

Thereafter, the third sealing block 33 is inserted into the body 10 and laminated on the upper end S3 of the storage body S. As a result, the four storage bodies S are surrounded by the first to third sealing blocks 31, 32, 33. Finally, when the insertion portion 21 of the cover member 20 is inserted and seated through the doorway 11, the cover member 20 is fixed to the body 10 with the bolt B.

In conclusion, after the radioactive waste is first stored by the storage body S, the radioactive waste is enclosed by the first to third sealing blocks 31, 32, 33. Are accepted. As a result, even if the radioactive waste is varied, it can be repackaged in one packaging container 1 having an engineering barrier.

As described above, although described with reference to the preferred embodiment of the present invention, those skilled in the art various modifications and variations of the present invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

1 is a perspective view schematically showing a radioactive waste packaging container according to the present invention;

2 is an exploded perspective view of FIG. 1;

3 is a cross-sectional view taken along the line III-III of FIG. 1, and

4 is a cross-sectional view taken along line IV-IV of FIG. 1.

Description of the Related Art [0002]

1: radioactive waste container 10: body

11: entrance 20: cover member

30: sealing part 31: the first sealing block

32: second sealing block 33: third sealing block

Claims (9)

A packaging container body in which a plurality of storage bodies for storing different kinds of radioactive waste are accommodated, and provided with an entrance through which the storage bodies are inserted; And a plurality of sealing blocks made of bentonite material which are compression molded to be in close contact with the plurality of storage bodies at the same time and are inserted into the packaging container body, thereby sealing between the packaging container body and the storage body in the packaging container body. Seals; And A cover member for sealing an entrance and exit of the packaging container body; Radioactive waste packaging container comprising a. The method of claim 1, The sealing part, At least one first sealing block sealing the front and rear ends of the storage body based on the insertion direction of the storage body with respect to the packaging container body; And At least one second sealing block sealing a side of the storage body based on an insertion direction of the storage body with respect to the packaging container body; Radioactive waste packaging container comprising a. The method of claim 2, The second sealing block, Radioactive waste packaging container characterized in that it comprises a support groove for entering the shape corresponding to the outer surface of the reservoir to support the reservoir. The method of claim 2, The second sealed block is a radioactive waste packaging container characterized in that it is provided in a pair to face each other with one of the reservoir therebetween. The method of claim 1, The cover member is a radioactive waste packaging container, characterized in that it comprises a stepped insertion portion to be introduced into a predetermined depth into the entrance and exit of the packaging container body, it is coupled to the packaging container body by a fastening means. 6. The method according to any one of claims 1 to 5, The packaging container body is formed of a concrete material, The dry density of the bentonite is radioactive waste packaging container, characterized in that more than 1.2Mg / ㎥. A plurality of first containers in which different kinds of radioactive waste are stored; A sealing part including a plurality of sealing blocks made of bentonite material which are compression molded to be in close contact with the plurality of first containers at the same time to be sealed and inserted into the first container; And A second container made of concrete to wrap and seal the sealing part; Radioactive waste packaging container comprising a. The method of claim 7, wherein The sealing part, At least one first sealing block for sealing a lower end of the first container; At least one second sealing block having a support groove surrounding the side surface of the first container and provided in a pair with the first container therebetween; And At least one third sealing block sealing an upper end of the first container; Radioactive waste packaging container comprising a. 9. The method according to claim 7 or 8, The second container, A rectangular body in which an accommodation space for accommodating the first container and the sealed part is formed, and an opening having one side opened to allow the first container and the sealed part to be inserted into the accommodation space; And A cover member inserted into a doorway of the body to a predetermined depth to seal the doorway, the cover member being fastened and fixed to the body by a screw; Radioactive waste packaging container comprising a.

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