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Report No.
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Basic study on decontamination of TRU wastes with cerium mediated electrolytic oxidation method

Ishii, Junichi; Kobayashi, Fuyumi ; Uchida, Shoji; Sumiya, Masato; Kida, Takashi; Shirahashi, Koichi ; Umeda, Miki ; Sakuraba, Koichi

At Nuclear Fuel Cycle Safety Engineering Research Facility, the cerium mediated electrolytic oxidation method which is a decontamination technique to decrease the radioactivity of TRU wastes to the clearance-level has been developed for the effective reduction of TRU wastes generated from the decommissioning of a nuclear fuel reprocessing facility and so on. This method corrodes the oxide layer and the surface of metallic TRU metal wastes by the strong oxidation power of Ce$$^{4+}$$ in nitric acid. In this study, parameter tests were conducted to optimize the solution condition of Ce$$^{3+}$$ initial concentrations and nitric acid concentrations. The target corrosion rate of metallic TRU wastes set to be 2$$sim$$4$$ mu$$m/h for the practical use of this method. Under the optimized solution condition, a dissolution test of stainless steel simulating wastes was carried out. From the result of the dissolution test, the average corrosion rate was 3.3 $$mu$$m/h during the test time of 90 hours. Based on the supposition that the corrosion depth of metallic TRU wastes was 20 $$mu$$m enough to achieve the clearance-level, the treatment time for the decontamination was about 6 hours. It was confirmed from the result that the decontamination could be performed within one day and the decontamination solution could repeatedly reuse 15 times.

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