Abstract
Present status of research and development on pyrometallurgical reprocessing technology in Central Research Institute of Electric Power Industry is described with emphasis on electrorefining and waste salt immobilization. As for the electrorefining, three different electrodes — anode basket, solid cathode, and liquid-cadmium cathode — have been being investigated; prismatic anode basket with faster rotation was found to accelerate metal-fuel dissolution. Morphology and collection efficiency of electrodeposited uranium on solid cathode were found to vary with ratio of cathode to anode surface area. Liquid-cadmium cathode with a paddle-shape stirrer was developed and determined maximum uranium concentration into the cathode without dendrite formation. As for waste salt immobilization, sodalite is proposed as waste form and synthesized by dry reaction without gas generation. Measured leachability of the synthesized sodalite is as low as those of vitrified waste form.
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