The Results of HLW Processing Using Zirconium Salt of Dibutyl phosphoric Acid in Hot Cell

Zirconium salt of dibutyl phosphoric acid (ZS HDBP), is an effective solvent for liquid HLW and ILW (high and intermediate level wastes) processing with radionuclide partitioning into different groups for further immobilization according to radiotoxicity. The rig trials in mixer-settles in hot cells were carried out using 30 L of real HLW containing transplutonium (TPE), rare earths (RE), Sr and Cs in 2 mol/L HNO3, characterized by total specific activity 520 MBk/L. The recovery factor for TPE and RE was as high as 104, but only 10 for Sr. Purification factor of TPE and RE from Cs and Sr was 104, and that of Sr from TPE and Cs was 103. Almost all Cs was localized in the second cycle raffinate. So Zr salt of HDBP can be used in HLW processing with radionuclide partitioning with respect to the categories of radiotoxicity. (authors)