전해환원공정발생 LiCl 염폐기물 재생기술

Reuse Technology of LiCl Salt Waste Generated from Electrolytic Reduction Process of Spent Oxide Fuel

조용준, 정진석, 이한수, 김인태

Abstract

Layer crystallization process was tested for the separation(or concentration) of cesium and strontium fission products in a LiCl waste salt generated from an electrolytic reduction process of a spent oxide fuel. In a crystallization process, impurities (CsCl and SrCl2) are concentrated in a small fraction of the LiCl salt by the solubility difference between the melt phase and the crystal phase. Based on the phase diagram of LiCl-CsCl-SrCl2 system, the separation possibility by using crystallization was determined and the molten salt temperature profile during layer crystallization operation was predicted by using mathematical calculation. In the layer crystallization process, the crystal growth rate strongly affects the crystal structure and therefore the separation efficiency. In the conditions of about 20-25 l/min cooling air flow rate and less than 0.2 g/min/cm2 crystal flux, the separation efficiency of both CsCl and SrCl2 showed about 90 % by the layer crystallization process, assuming a LiCl salt reuse rate of 90 wt%.

Key Words : 파이로공정, LiCl 염페기물, 재생, Cs/Sr 분리, 경막결정화, pyroprocessing, LiCl salt waste, reuse, Cs/Sr separation, layer crystallization

Reference

JNFCWT

Online Submission

Korean Radioactive
Waste Society (KRS)

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