Treatment method of radioactive dry waste in nuclear power plant

Abstract

The invention discloses a method for treating dry radioactive waste of a nuclear power plant by adopting a vacuum pyrolysis method. The method is characterized by comprising steps as follows: (1), pretreatment: the dry radioactive waste is subjected to sorting and grinding; (2), pyrolysis: the dry radioactive waste is subjected to pyrolysis in a vacuum pyrolysis furnace; (3), filtering: pyrolysis gas is filtered; (4), cement solidification: ash obtained after complete reaction of the dry radioactive waste is subjected to cement solidification treatment. The method for treating the dry radioactive waste of the nuclear power plant adopts low-temperature vacuum pyrolysis and is reliable and easy to implement, equipment is simple, less secondary waste is produced, toxic and harmful gas such as dioxin and the like cannot be produced, the volume reduction effect is similar to that of incineration, and the volume reduction effect on pure cotton work clothes can be higher than 80:1; the volume of the final radioactive solid waste of the nuclear power plant is remarkably reduced, the temporary storage pressure of a radioactive solid waste temporary storage depository is relieved, the final treatment cost of the radioactive solid waste is greatly reduced, and the method has good economic efficiency and environmental protection property.

Description

technical field [0001] The invention relates to a treatment method for nuclear power plant radioactive dry waste, in particular to a treatment method for nuclear power plant radioactive dry waste, in particular to a treatment method for nuclear power plant radioactive dry waste using a vacuum pyrolysis method. Background technique [0002] During the operation and maintenance of nuclear power plants, a large amount of compressible maintenance dry waste, including work clothes, work shoes, paper, clothes, plastics, rubber, etc., will be produced, with a volume of 125m 3 / unit • years or so. This kind of waste will be discarded after generation. However, due to its radioactivity, a small part of it has a surface dose rate of > 2mSv / h. In order to prevent the spread of radionuclides contained in the waste from endangering public and environmental safety, it needs to be reconditioned. According to national standards, the volume of radioactive solid waste in nuclear power pl...

AI Technical Summary

Problems solved by technology

Third, due to the limitations of physical compression, the method of compression and cement curing can only achieve the effect of neither increasing nor reducing volume.

Fourth, the method of compression and cement solidification has a large volume of final solid waste, and the cost of geological disposal is relatively high, which has a great impact on the environment.

Fifth, the inherent characteristics of the compression and cement curing method also determine the required process equipment is more, and the interface is complicated

However, the incineration process will produce toxic and harmful gases such as dioxin, which will have a certain impact on the environment. In addition, the operating temperature of the incinerator is high and the maintenance cost is high

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