Development of chemical decontamination process with sulfuric acid-cerium (IV) for decommissioning. Single step process to dissolve chromium-rich oxides.:Single Step Process to Dissolve Chromium-Rich Oxides

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概要

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• The dissolution of Cr-rich oxides in and the decontamination of contaminated specimens by sulfuric acid-Ce (IV) (SC) solution have been investigated. The results have been compared with those by the reported typical decontamination reagents. The SC solution can dissolve simultaneously not only Cr but also Fe and Ni in the Cr-rich oxides. The dissolution mainly depends on Ce (N) concentration (1.310 × 10<SUP>-3</SUP> M) and temperature (4090°C), but is independent of H<SUB>2</SUB>SO<SUB>4</SUB>-concentration (0.20.5 M at 5 × 10-3 M Ce (IV)). The DF is ca. 33 at 90°C for 24 h with 0.25 M H2SO4 -5 × 10<SUP>-3</SUP> M Ce (IV). Under electrolytic regeneration of Ce (IV) from Ce (III) during the decontamination, the DF is raised to 460 even at 80°C for 24 h with 0.25 M H<SUB>2</SUB>SO<SUB>4</SUB> -1.3 × 10<SUP>-3</SUP> M Ce (IV). The SC solution can be applicable to the decontamination for decommissioning of both BWR and PWR. Furthermore the combination of the chemical cleaning with an additional ultrasonic cleaning provides a promissing cleaning procedure for post-disassembly components.

• 一般社団法人 日本原子力学会の論文

著者

• Tachikawa Enzo

  Department of Chemistry, Japan Atomic Energy Research Institute

• SUWA Takeshi

  Department of Chemistry, Japan Atomic Energy Research Institute

• KURIBAYASHI Nobuhide

  Department of Chemistry, Japan Atomic Energy Research Institute

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• Development of chemical decontamination process with sulfuric acid-cerium (IV) for decommissioning. Single step process to dissolve chromium-rich oxides.:Single Step Process to Dissolve Chromium-Rich Oxides
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