Japan Nuclear Cycle Development Institute (JNC) is studying the electro-winning process using NaCl-2CsCl molten salt as a dry reprocessing technology development. It would be necessary to repeatedly purify the used salt after the MOX co-deposition electrolysis and the MA recovery in this process. JNC had selected the phosphate precipitation method as a purification technique of the used salt, and we carried out the phosphate precipitation experiment.
In this experiment, Na3PO4 was added into the NaCl-2CsCl molten salt including fission product (FP) ions (Ce3+ Nd3+, Sr2+) of non-radioactive, and we investigated the removing performance of FP ions from the NaCl-2CsCl molten salt by the phosphate precipitation. In conclusion, we confirmed most of FP ions in the molten salt were removed by adding Na3PO4 of 1.5 times the mole amount of the FP content.
