The Mark-Ⅳ electrorefiner (Mk-Ⅳ ER) contains an electrolyte/molten cadmium system for refining uranium electrochemically. Typically, the anode of the Mk-Ⅳ ER consists of the chopped sodium-bonded metallic driver fuels, which have been primarily U-10Zr binary fuels. Chemical analysis of the residual anode materials after electrorefining indicates that a small amount of cadmium is removed from the Mk-Ⅳ ER along with the undissolved anode materials. Investigation of chemical analysis data indicates that the amount of cadmium in the undissolved anode materials is strongly correlated with the anode rotation speeds and the residence time of the anode in the Mk-Ⅳ ER. Discussions are given to explain the prescribed correlation.
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