Development of the electrorefining analysis code in the dry reprocessing

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The electrorefining using molten salt is employed in some pyrochemical reprocessing systems. The material behavior in this process, however, is not sufficiently clarified because of the lack of experimental data. The objective of this study is to develop the analysis code of the material behavior. There are two kinds of codes for the analysis of electrorefining process. One is based on the model of material behavior in macroscopic region, which calculates the electrical potential distribution and the current density distribution from electrical potential difference between anodes and cathodes, and obtain the amount of deposited material with spatial distribution on cathode surface. The other is based on the model of material behaviors in microscopic region, which calculates material concentrations on cathode surface with the Nernst's equation from cathode electrical potential, and estimates deposition yields to solve the diffusion equation with material concentrations in molten salt and on cathode surface. In this study, the analysis code, that is able to treat material behaviors with the model of ones in macroscopic and microscopic region and consider molten salt flow, has been developed. As a result, it is confirmed that the segregation of the deposit on cathod caused by the current density distribution is disappeared by stirring molten salt and PuO is efficiently recovered in the MOX electrolysis in which Pu4 is oxidized to PuO by O and PuO is reduced by electrochemical reaction.