A critical safety control method for a dissolver with ring-shaped solid neutron poison partition layout

Abstract

The invention relates to the critical safety control technologies of nuclear fuel reprocessing plant dissolvers, in particular to a critical safety control method for a dissolver with an annular solid neutron poison partition layout. The dissolver includes a big hanging basket disposed in a dissolver intramural dissolution solution. The big hanging basket is internally provided with a solid neutron poison partition structure, which comprises an annular neutron poison layer. The inner side and the outer side of the neutron poison layer are respectively provided with a poison outer coating shell and a poison inner coating shell, and the poison inner coating shell is internally provided with a neutron moderation material. The method provided by the invention improves the cross-sectional area and loading capacity of the reprocessing plant key technological equipment dissolver, and can solve the critical safety control problem of reprocessing plants.

Description

technical field [0001] The invention relates to a critical safety control technology for a dissolver of a nuclear fuel reprocessing plant, in particular to a critical safety control method for a dissolver in which annular solid neutron poisons are arranged in partitions. Background technique [0002] Spent fuel reprocessing is an important stage of a closed nuclear fuel cycle, and the process mainly includes head-end treatment, chemical separation, and uranium and plutonium tail-ends. Among them, the head-end treatment is mainly to cut, dissolve, filter, and season the spent fuel components in preparation for chemical separation. [0003] The dissolver is a key process equipment for the head-end treatment of the reprocessing plant, and its main function is to dissolve the spent fuel cut into short sections. The batch dissolver currently used in China can handle the initial 235 The power reactor spent fuel assembly with a U enrichment degree of 3.3wt% and a maximum burnup c...

AI Technical Summary

Problems solved by technology

During the shearing process, the remaining spent fuel assembly fragments hang in the shearing hot chamber, and the remaining spent fuel assembly fragments act as a strong radiation source, which will not only make the precision parts of the shearing machine, gas pipelines, cables Radiation damage, etc., accidentally falling into the dissolver increases the feeding volume, which affects critical safety, increases the release of radioactive gases or aerosols, which affects the ventilation system, and also affects the related operations of the shear heat chamber, such as heat chamber maintenance, hanging basket transfer and cladding dumping etc.

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