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ISSN : 1738-1894(Print)
ISSN : 2288-5471(Online)
Journal of Nuclear Fuel Cycle and Waste Technology Vol.5 No.1 pp.39-52
DOI :

사용후핵연료의 연소도 변화에 따른 산화 및 OREOX 공정에서 핵분열기체 방출 특성

Release Characteristics of Fission Gases with Spent Fuel Burn-up during the Voloxidation and OREOX Processes

Geun IL Park, Kwang Hun Cho, Jung Won Lee, Jang Jin Park, Myung Seung Yang, Kee Chan Song

Abstract

Quantitative analysis on release behavior of the fission gases from the spent fuel material during the voloxidation and OREOX process has been performed. This thermal treatment step in a remote fabrication process to fabricate the dry-processed fuel from spent fuel has been used to obtain a fine powder The fractional release percent of fission gases from spent fuel materials with burn-up ranges from 27,000 MWd/tU to 65,000 MWd/tU have been evaluated by comparing the measured data with these initial inventories calculated by ORIGEN code. The release characteristics of fission gases during the voloxidation process at seem to be closely linked to the degree of conversion efficiency of powder, and it is thus interpreted that the release from grain-boundary would be dominated during this step. The high release fraction of the fission gas from an oxidized powder during the OREOX process would be due to increase both in the gas diffusion at a temperature of in a reduction step and in U atom mobility by the reduction. Therefore, it is believed that the fission gases release inventories in the OREOX step come from the inter-grain and inter-grain on matrix. It is shown that the release fraction of fission gases during the voloxidation step would be increased as fuel burn-up increases, ranging from 6 to 12%, and a residual fission gas would completely be removed during the OREOX step. It seems that more effective treatment conditions for a removal of volatile fission gas are of powder formation by the oxidation in advance than the reduction of spent fuel at the higher temperature.
DUPIC, Spent fuel. Voloxidation, OREOX, Oxidized powder, Fractional releasepercent, 85Kr, 14C, 듀픽, 사용후핵연료. 휘발성산화, 산화 · 환원, 산화분말, 방출 분율, 85Kr,14C

 

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