Treatment method, system and product for with radioactive devices of nuclear power station

Abstract

The invention discloses a treatment method, system and product for radioactive devices of a nuclear power station. The method comprises a disassembling step, a cutting and sorting step, a decontamination step and a smelting step. In the disassembling step, a radioactive to-be-treated device is disassembled, all parts of the radioactive to-be-treated device are obtained, in the cutting and sortingstep, cutting and sorting are conducted according to the preset specification and size corresponding to each part so that spare parts with corresponding specifications and sizes are obtained, in the decontaminating step, the spare parts with the corresponding specifications and sizes are decontaminated to obtain corresponding materials, in the smelting step, a reusable metal is melt in the materials and curing treatment is carried out on a non-reusable metal in the materials. Volume reduction treatment of the radioactive contaminated device in the nuclear power station is achieved through thedecontamination step and the cutting and sorting step, and an occupied space is reduced. Through the decontamination step and the smelting step, reuse of materials is achieved, and the big problem that radioactive contaminated devices are difficult to dispose is solved.

Description

technical field [0001] The invention relates to the technical field of nuclear power, in particular to a disposal method, system and product for nuclear power plants with radioactive devices. Background technique [0002] A spent fuel grid is a device used to store spent fuel assemblies discharged from the core of a nuclear power plant, new fuel assemblies, control rod assemblies, and damaged fuel assemblies. The early spent fuel grid neutron absorbing material used cadmium metal, and the sleeve size was large, which could accommodate 36 fuel assemblies. Its structure is as figure 1 As shown, it is mainly composed of a lower support plate, an upper support plate, a hoarding plate, a sleeve, a foot and connecting fasteners. The new spent fuel grid uses aluminum-based boron carbide as the neutron absorbing material. A spent fuel grid can accommodate 56 sets of fuel assemblies. In order to store more spent fuel assemblies in the spent fuel pool, some power plants use A trans...

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Problems solved by technology

The main shortcomings of this technical solution are as follows: 1. The Ministry of Environmental Protection of the People's Republic of China stipulates that the radioactive solid waste storage needs to establish corresponding waste temporary storage facilities, and simultaneously store The maximum lifespan is 5 years, and the original technical scheme needs to adopt other schemes for disposal after reaching the temporary storage period; 2. With the scheme of temporary storage and disposal, 20 spent fuel grids and their packaging materials will occupy about 300m 3 will occupy the storage space of radioactive machine repair, decontamination and storage workshops, seriously affecting the daily maintenance operations in this area; 3. Although the decontamination methods such as high-pressure water washing are adopted in this plan, the spent fuel grid still has certain Radioactive, presenting a potential exposure risk to personnel working in the area

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