JPH0690314B2 - Radioactive waste treatment method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radioactive waste treatment method for burying radioactive waste in the ground or discarding it into the ocean.

[0002]

BACKGROUND OF THE INVENTION The amount of various radioactive wastes carried out from various nuclear facilities such as nuclear power plants is ever increasing. Among these radioactive wastes, medium and low level radioactive wastes are put in radioactive waste treatment containers such as drums, solidified, sealed with a lid and suitable for underground burial or ocean dumping. It is in the final form.

Various types of containers for treating radioactive waste have been proposed in the past.
For example, a radioactive waste treatment container obtained by impregnating a mild steel drum can or steel fiber reinforced concrete molded into a container shape with a polymerizable impregnating agent and polymerizing and solidifying the mixture (Japanese Patent Publication No. 56-1284).
No. 0), a radioactive waste treatment container (Japanese Patent Publication No. 57-34518) obtained by partially impregnating a steel fiber reinforced concrete molded into a container shape with a polymerizable impregnating agent and polymerizing and solidifying it, or as an outer shell. A multi-layered container having a double structure of an outer shell and an inner shell, which is made of a metal container, concrete reinforced on the inner surface of the metal container and reinforced with a reinforcing agent, and further reinforced with an impregnating agent. 59-8599
No. 9) has been proposed.

Then, for example, fine radioactive waste such as powdery or granular incinerated ash and other machinery contaminated with radioactive substances are filled in a radioactive waste treatment container together with a cement solidifying material and solidified. After that, the cement paste is filled on the radioactive waste layer, and an inner lid coated with an adhesive is arranged around the inner surface side, and then the outer lid is arranged with respect to the radioactive waste treatment container. It is considered to be buried underground or dumped in the ocean.

However, various radioactive wastes are filled in a radioactive waste treatment container together with a cement solidifying material and solidified, and then the radioactive waste layer is filled with cement paste, and an epoxy system is provided around the inner surface side. In the processing method in which the inner lid coated with the adhesive is arranged, and the outer lid is arranged with respect to the radioactive waste treatment container, the degree of encapsulation by the epoxy adhesive is not so good, for example, there is a pinhole,
There were cases where there was a problem with hermeticity.

[0006]

DISCLOSURE OF THE INVENTION In view of the above problems, the present inventor does not apply the adhesive to the inner surface of the lid in advance, but after covering the lid, injecting the adhesive from above the lid. However, the nozzle used for the injection filling was blocked by the adhesive remaining inside even after the work, and the nozzle could not be reused.

Therefore, in order to reuse the nozzle, it was considered to wash the nozzle with a solvent after the injection and filling work of the adhesive, but since the radioactive waste treatment work is performed in a closed space. However, the sealed space is contaminated due to the evaporation of the solvent used for this cleaning, and it is difficult to take measures against this solvent contamination, and in reality, this technical idea could not be adopted.

With respect to such a point, the present inventor has further earnestly conducted research and development, and as a result, in order to reuse the nozzle, a multi-liquid curing type adhesive was used and After the injection and filling work, it became clear that it would be better to fill one liquid in the nozzle to prevent the hardening. The present invention has been achieved based on this revelation, and its first object is to provide a radioactive waste treatment method that is excellent in encapsulation with an adhesive and that can treat radioactive waste with good airtightness. is there.

A second object of the present invention is to provide a radioactive waste treatment method which can reuse the nozzle used in the bonding work and has a low treatment cost. A third object of the present invention is to provide a radioactive waste treatment method that requires no special measures at the time of treatment work and has a low work cost.
The object of the present invention is to inject a multi-liquid curable adhesive from a nozzle arranged on the upper part of the lid after fitting a lid to a treatment container for radioactive waste, and after injecting the multi-liquid curable adhesive into the nozzle. It is achieved by a method for treating radioactive waste, which is characterized in that only a part of the liquid of the adhesive of 1 is filled.

[0010]

FIG. 1 is an explanatory view showing one embodiment of the radioactive waste treatment method according to the present invention. In the figure, A is the main body of the radioactive waste treatment container, and the main body A of this treatment container is
For example, a steel drum can 1 is integrally provided with a polymer-impregnated concrete layer 2 lined therein.

Reference numeral B denotes a polymer-impregnated concrete lid used as an inner lid of the processing container main body A. The lid B has a top surface and a bottom surface (for example, 3 c from the outer circumference).
The sponge tapes 3 and 4 are provided on the inner side (about m). The lid B can be obtained, for example, by pouring steel fiber concrete, allowing it to stand for a predetermined time, injecting a polymerizable monomer into it, polymerizing it, and then pasting sponge tapes 3 and 4 at predetermined positions. .

C is a nozzle arranged above a lid B which is closed on the container body A. Although only the tip portion of the nozzle C is shown, the main component of the two-component curing type epoxy adhesive and the curing agent are sufficiently stirred in the nozzle C using, for example, a static mixer. It is configured to be supplied later. Examples of the two-component curing type epoxy adhesive include Technodyne N86A and Technodyne N86AL manufactured by Taoka Chemical Co., Ltd.

The processing container body A having the above-mentioned structure
Explaining the treatment method using the lid B and the nozzle C, first, after putting various kinds of radioactive waste into the treatment container main body A, for example, water and a paste containing ordinary Portland cement mixed at a predetermined ratio are filled. After that, a lid B is placed on the cement paste, and an epoxy adhesive (main agent and curing agent) is applied from a nozzle C placed above the lid B.
Is injected into the adhesive reservoir 5 formed between the sponge tape 3 provided on the lid B and the drum can 1, the adhesive filled in the adhesive reservoir 5 is placed between the lid B and the drum can 1. The space 7 formed under the lid B through the passage 6 is fully filled, and the waste can be treated with high airtightness.

Even if the nozzle C for injecting the adhesive is operated from a distance, since the adhesive reservoir 5 is formed widely, the adhesive can be injected into the adhesive reservoir 5 without fail, so that the radiation The risk of radiation exposure can be reduced accordingly. Since the sponge tape 4 is also provided on the lower surface side of the lid B, the adhesive that has been injected and filled is not covered with the sponge tape 4.
Therefore, a large amount of the adhesive does not flow out to the side of the processing container body A filled with the radioactive waste, and the adhesive is not wasted.

After that, the main body A of the processing container (drum can 1)
Then, the outer lid is closed and the waste is transported to the disposal site, whereby the treatment of radioactive waste is completed. The injection and filling work of the adhesive from the nozzle C is completed (the completion of the injection and filling work for one day)
Then, on the lid B at the time of the final treatment, after the adhesive is injected and filled, only the main agent of the two-component curing type adhesive is injected and filled into the nozzle C, and the nozzle C is treated so that only the main agent remains. . By doing so, since the two-component curing type adhesive agent is not cured only by the main agent, the adhesive agent is not cured and blocked in the nozzle C, and the nozzle C can be reused on the next day. For use on the next day, the main component in the nozzle C may be discharged, and then the mixed liquid of the main component and the curing agent may be supplied.

Since it is not necessary to wash the nozzle C with a solvent after the adhesive is injected and filled, the workplace treating the radioactive waste is not contaminated with the vaporized solvent, and no countermeasure is required for this contamination. Does not increase costs for waste treatment.

[0017]

[Effect] In the radioactive waste treatment method according to the present invention, after the lid is fitted to the radioactive waste treatment container, a multi-liquid curing type adhesive is injected from a nozzle arranged on the upper part of the lid, and after the injection, Since the nozzle is filled with only a part of the liquid of multiple liquid curable adhesive, the adhesive injected from above the lid passes through the passage between the lid and the container body, and It is filled in the space that is formed in the space, can be sealed against radioactive waste with high airtightness, can be processed without fear of pinholes, etc., and the nozzle used for bonding work can be reused and adhesive injection No need to wash the nozzle with solvent after filling, the workplace treating radioactive waste is not contaminated with vaporized solvent, no countermeasures against this contamination are required, and the cost of radioactive waste treatment is low. It has features such as

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of a radioactive waste treatment method according to the present invention.

[Explanation of symbols]

 A Main body of radioactive waste treatment container B Lid C Nozzle 1 Drum can 2 Polymer impregnated concrete layer 3,4 Sponge tape 5 Adhesive reservoir 6 Passage 7 Space

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kanjiro Ishizaki 2-1-1 Tsukimi-cho, Kumagaya-shi, Saitama Chichibu Cement Co., Ltd. Central Research Laboratory (72) Inventor Naoaki Koyanagi, Tsukimi-cho, Kumagaya-shi, Saitama 1-1-1 Chichibu Cement Co., Ltd. Central Research Laboratory (72) Inventor Akira Asami 2-1-1 Tsukimi-cho, Kumagaya-shi, Saitama Chichibu Cement Co. Central Research Laboratory (72) Inventor Hiroyuki Yamaguchi Osaka City, Osaka Prefecture 4-21 Nishimikuni, Yodogawa-ku Taoka Chemical Industry Co., Ltd.

Claims (1)

[Claims] 1. A multi-liquid curing type adhesive is injected from a nozzle arranged on the upper part of the lid after a lid is fitted to a radioactive waste treatment container, and the multi-liquid curing type adhesive is adhered to the nozzle after the injection. A method for treating radioactive waste, which comprises filling only a part of the liquid of the agent.