Development of chemical decontamination process with sulfuric acid-cerium (IV) for decommissioning. System decontamination process with electrolytic regeneration of Ce4+ from Ce3+.:System Decontamination Process with Electrolytic Regeneration of Ce<SUP>4+
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概要
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The electrolytic regeneration of Ce<SUP>4+</SUP> from Ce<SUP>3+</SUP>, which is required to achieve a high decontamination factor (DF) in this process, has been investigated. A calculating model was derived for the regenerating current required during the decontamination as a function of dissolution rate of crud, corrosion rate (R<SUB>c</SUB>), current efficiency (η<SUB>e</SUB>) and characteristics of decontamination loop. From the above calculation, it was found that the current was mainly governed by R<SUB>c</SUB> and η<SUB>e</SUB>. A condition to obtain a high DF at low R<SUB>c</SUB> and high η<SUB>e</SUB> has been found experimentally by use of a mixture of Ce<SUP>3+</SUP> and Ce<SUP>4+</SUP> at the ratio of Ce<SUP>4+</SUP>/Ce<SUP>3+</SUP>=0.10.2. The desired values to be η<SUB>e</SUB> ?? 80% at above 50 A/m<SUP>2</SUP> was obtained under the flow rate above 300 cm/min and Ce<SUP>3+</SUP> concentration above 10×10<SUP>-3</SUP> M at 60°C using the dual-cylindrical type cell. The current efficiency was also investigated with cells of various geometries. The present decontamination process has been proposed as a system decontamination process, which is essentially a single-step decontamination process for Cr-rich oxides.
- 一般社団法人 日本原子力学会の論文
著者
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Tachikawa Enzo
Department of Chemistry, Japan Atomic Energy Research Institute
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SUWA Takeshi
Department of Chemistry, Japan Atomic Energy Research Institute
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KURIBAYASHI Nobuhide
Department of Chemistry, Japan Atomic Energy Research Institute
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