JPH04359196A - Radioactive waste disposing method - Google Patents

Abstract

PURPOSE:To effectively utilize radioactive wastes by filling the fine powder generated when the concrete of a nuclear power-related facility is crushed into a radioactive waste disposing container inserted with miscellaneous solids. CONSTITUTION:Reclaimed coarse aggregates, reclaimed fine aggregates and fine sand obtained from the wastes generated when the concrete of a nuclear power-related facility is demolished are utilized for the construction material of the nuclear power-related facility, however fine powder is hard to utilize. The fine powder is utilized as a filling material when radioactive wastes are disposed. A kneaded material of the fine powder generated when the concrete of building demolition is crushed and Solfix 12(R) is filled into a radioactive waste disposing container inserted with miscellaneous solids simulating actual wastes. The miscellaneous solids are solidified in the radioactive waste disposing container, and higher safety is expected. The fine powder itself may be polluted by the radioactive material, however it is carried into a radioactive waste disposal site later on, and there is no problem.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for disposing of radioactive waste that effectively utilizes fine powder generated by crushing concrete in nuclear facilities.

0002

[Background of the Invention] The peaceful use of nuclear energy has been in use in Japan for more than 30 years, and today it is attracting worldwide attention. Nuclear power generation is one of the peaceful uses of nuclear energy.
Today, nuclear power generation plays a major role as a stable source of electricity supply. By the way, just as all things have a lifespan, nuclear power plants cannot avoid their lifespan. If this is a normal facility, there would not be much of a problem with how to dispose of it after dismantling the facility, but the treatment and disposal of dismantled waste from nuclear power plant facilities will need to be considered in the future, including economic considerations.

[0003] Furthermore, it is estimated that hundreds of thousands of tons of waste will be generated when nuclear power plant facilities are dismantled. Currently, disposing of a large amount of waste at a general industrial waste disposal site may become a problem in the future due to location issues at the general industrial waste disposal site, but disposing of it at a radioactive waste disposal site is However, there is a problem from an economic point of view, and there is a need to reuse demolition waste.

0004

[Disclosure of the invention] By the way, 90% of the hundreds of thousands of tons of waste generated by dismantling nuclear power plant facilities
The remainder is believed to be concrete and rebar scrap. Moreover, it is estimated that most of the concrete has a low radioactivity level of less than 10-4 curies/ton. Although it is thought that such low-level waste does not need to be transported to a radioactive waste disposal site, a more rational disposal method is expected.

[0005] Furthermore, in Japan, the basic policy of the country is to dismantle nuclear power plant facilities that have reached the end of their service life and to utilize the sites. In other words, the dismantling of nuclear power plant facilities does not mean that nuclear power generation is no longer necessary; instead, a new nuclear power plant will need to be constructed in conjunction with the dismantling. Construction of this nuclear power plant requires large amounts of concrete materials.

[0006] Therefore, if the concrete waste from nuclear power plants generated from the demolition of concrete with low radioactivity levels or virtually no contamination problems as described above could be effectively used in the construction of new nuclear power plants,
It is thought that it will be possible to eliminate wasteful use of resources, ensure a higher level of safety, and reduce the cost of demolition. The applicant of the present application proposes to crush this material and use it as construction material (aggregate) for nuclear power plants.

By the way, when producing aggregate by crushing concrete waste, a large amount of fine powder is produced. This large amount of fine powder must also be effectively processed. In addition, when processing this, consideration must be given to the fact that the waste comes from a nuclear power related facility. The present invention has been made in view of this point of view,
An object of the present invention is to provide a technique for effectively utilizing waste materials generated by dismantling nuclear power related facilities and reducing processing costs.

An object of the present invention is to provide a radioactive waste disposal method characterized by filling a radioactive waste disposal container containing miscellaneous solids with fine powder generated by crushing concrete of a nuclear power related facility. achieved. The present invention is also achieved by a radioactive waste disposal method characterized by filling a radioactive waste disposal container containing miscellaneous solids with fine powder and solidification material generated by crushing concrete in nuclear facilities.

[0009] Furthermore, according to a radioactive waste disposal method characterized by filling the gaps between radioactive waste disposal containers placed in a radioactive waste disposal site with fine powder generated by crushing concrete of a nuclear power related facility. achieved. In addition, by a radioactive waste disposal method characterized by filling the gaps between radioactive waste disposal containers placed at a radioactive waste disposal site with fine powder and solidification material generated by crushing concrete of nuclear power related facilities. achieved.

That is, according to the present invention, a radioactive waste processing container containing miscellaneous solids, including fine powder generated by crushing concrete of nuclear power-related facilities, as well as inorganic solidifying materials such as cement and water glass, is used. By filling the gaps between radioactive waste processing containers placed in radioactive waste disposal sites, the fine powder generated when crushing concrete at nuclear power related facilities to produce aggregate can be removed. It can be effectively used to dispose of radioactive waste, and if used in this way, there will be no problem even if the concrete is contaminated with radioactive substances, resulting in highly safe disposal. Further, there is no need for special disposal as radioactive waste, and the processing cost becomes lower accordingly.

The present invention will be explained in more detail. Nuclear power related facilities generate various wastes, and aggregates can be made from the waste generated from the concrete demolition of nuclear power related facilities. In order to obtain aggregate from concrete waste generated from the concrete demolition of nuclear power-related facilities, the first step is to roughly break it using a hydraulic breaker, etc.
Crushing is performed to about m square pieces. After this, in the second step, the earth and sand adhering to the concrete mass is removed by a grizzly bear, and in the third stage, the concrete mass is broken into smaller pieces using a jaw crusher or the like, and the reinforcing bars and concrete are separated. In the next fourth step, the peeled reinforcing bars are removed by a magnetic separator. After removing the reinforcing bars using a magnetic separator, the fifth step is primary crushing using an impact crusher. That is, a concrete block conveyed by a belt conveyor is crushed by an impact crusher, and then crushed by a screen into particles of about 0 to 10 mm and 10 to 40 mm.
Separated into grains of about 40 mm and grains of 40 mm or more,
The grains above are returned to the impact crusher again, and the grains from 0 to
Obtain 10 mm grains and 10-40 mm grains. In the sixth step, the particles of about 10 to 40 mm obtained in the primary crushing step are sent to a coarse aggregate regenerator for treatment, and are sieved through a screen to obtain recycled coarse aggregate. In the seventh stage, the particles of about 0 to 10 mm obtained in the primary crushing process are sent to a fine aggregate regenerator for processing, and are sieved through a screen to produce recycled fine aggregate, fine sand, and fine powder ( sludge) is obtained.

By the way, the applicant has proposed that the recycled coarse aggregate, recycled fine aggregate, and fine sand thus obtained be used as construction materials for nuclear power related facilities. Fine powder is difficult to use as a construction material for nuclear power-related facilities. However, this fine powder is used when disposing of radioactive waste by filling it into radioactive waste processing containers containing miscellaneous solids or filling the gaps between radioactive waste processing containers placed at radioactive waste disposal sites. They realized that it could be used as a filling material. In other words, until now, miscellaneous solids have simply been placed in radioactive waste processing containers, but by filling them with fine powder like the one mentioned above and solidifying them, safety will be even higher. Even if there is a concern that the fine powder itself may be contaminated by radioactive substances, there is no problem because it will eventually be transported to a radioactive waste disposal site. In addition, the above-mentioned fine powder is filled into the gaps between the radioactive waste processing containers placed at the radioactive waste disposal site,
By solidifying the powder, it is expected that safety will be further increased, and there is no problem even if there is a concern that the fine powder itself may be contaminated by radioactive substances.

[0013] Filling a radioactive waste processing container containing miscellaneous solids or an SFPIC container (high integrity container of Chichibu Cement Co., Ltd.), or filling it between radioactive waste processing containers placed at a radioactive waste disposal site. To fill the gaps, fine powder alone may be used, but ordinary Portland cement, early strength Portland cement, ultra early strength Portland cement, moderate heat Portland cement, sulfate-resistant Portland cement, blast furnace cement, silica cement, fly ash cement, In addition, it is preferable to use a cement-based solidifying agent for soil containing a large amount of SO3.

[0014]

[Example 1] Instead of concrete from nuclear power related facilities, a mixture of fine powder generated from crushing concrete during building demolition and Solfix 12 (a cement solidifying agent manufactured by Chichibu Cement Co., Ltd.) was used to simulate actual waste. It was filled into a radioactive waste disposal container containing solids.

[0015] According to such treatment, miscellaneous solids become solidified in the radioactive waste treatment container, so
Expected to be safer.

[0016]

[Example 2] Instead of concrete from nuclear power related facilities, fine powder produced by crushing concrete during building demolition and a mixture of Solfix 12 (cement solidification material from Chichibu Cement Co., Ltd.) were used to simulate actual waste. It was filled into the gaps between radioactive waste disposal containers containing radioactive waste.

[0017] According to such processing, the gaps between the radioactive waste processing containers are filled, so it is expected that safety will be higher.

[0018]

[Effect] According to the present invention, the voids within the radioactive waste processing container and the gaps between the radioactive waste processing containers are filled.
It is expected that the safety of these products will be higher, and since the fine powder used for this is generated from crushing concrete at nuclear power related facilities, there will be no waste, and waste will be used effectively. , the cost of processing waste has become cheaper, and even if there is a concern that the fine powder generated by crushing concrete at nuclear facilities may be contaminated by radioactive materials, this is not a problem and is highly safe. The features of the system are played out.

Claims (4)

[Claims] 1. A radioactive waste disposal method, which comprises filling a radioactive waste disposal container containing miscellaneous solids with fine powder generated by crushing concrete of a nuclear power related facility. 2. A method for treating radioactive waste, which comprises filling a radioactive waste treatment container containing miscellaneous solids with fine powder and solidifying material generated by crushing concrete of a nuclear power related facility. 3. A method for treating radioactive waste, characterized in that fine powder generated by crushing concrete at a nuclear power-related facility is filled into gaps between radioactive waste treatment containers arranged at a radioactive waste disposal site. Claim 4: Radioactive waste characterized by filling the gaps between radioactive waste processing containers arranged at a radioactive waste disposal site with fine powder and solidifying material generated by crushing concrete of nuclear power related facilities. Processing method.