REDOX Decontamination Technique Development, (II)REDOX Decontamination System Using Pilot Plant

摘要

The decontamination technique is required to have a high decontamination rate and decontamination factor, to be applied to irregularly formed metallic wastes, and to minimize secondary waste volume for component replacement and decomissioning. The authors have developed a new decontamination technique using Ce4+ for decomissioning, namely "REDOX decontamination technique". In previous paper, the REDOX decontamination conditions and stainless steel and carbon steel dissolution conditions were established in fundamental tests. This paper describes about the establishment of REDOX decontamination system in the engineering scale equipment based on the fundamental test results. In comparison with the fundamental test results, Ce4+ generation rate and current efficiency, stainless steel and carbon steel dissolution rate, and Ce4+ regeneration rate and current efficiency were not effected by scaling up. The system which consists of Ce4+ generation-stainless steel and carbon steel decontamination (dissolution)-Ce4+ regeneration-reduction from Ce4+ ions to Ce3+ ions-drying-plasticization has been established in engineering scale equipment as the REDOX docontamination system.