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Hydrazine-based and tetramethylammonium hydroxide-based salt-free solvent wash reagents which can be decomposed and decreased in their volume were investigated in order to reduce the generation of radioactive waste from the solvent regeneration process in nuclear fuel reprocessing. These wash reagents were tested regarding their wash efficiency using simulated spent solvent which contained Ru, Zr, U and dibutylphosphate (DBP). The experimental results indicate that the wash efficiency depends mainly on the pH of the wash reagents. The DBP and metal-DBP complex are dissociated by hydroxide ion to become water soluble forms. Citrate ion in citrate wash reagents is effective for Zr under relatively lower pH conditions. The wash efficiency for Ru decrease gradually below pH7 independing on the kind of wash reagents. The solvent wash tests using mixer-settler also indicate that high pH is necessary to get high wash efficiency. However, metal-DBP complex and nitrosylruthenium complex are precipitated and accumulate on the interface between organic and aqueous phases in the mixer-settler.

nippon genshiryoku gakkaishi/nihon genshiryoku gakkaishi

Development of radioactive waste volume reduction technique from solvent regeneration process in nuclear fuel reprocessing. Wash efficiency and wash mechanisms of salt-free solvent wash reagents.