RECOVERY OF TECHNETIUM FROM HIGH-LEVEL LIQUID WASTE GENERATED IN NUCLEAR-FUEL REPROCESSING

We have been working on partitioning for high-level liquid waste during the past 20 years. In the present study we focus mainly on the four group separation. The main item to be established is how to separate transuranic elements (TRU) and Tc From high-level liquid waste (HLLW). The preferential separation of TRU was considered so as to avoid its spread into many fractions which would be generated in a partitioning process. The Te separation was conducted on the raffinate generated from the TRU extraction with diisodecylphosphoric acid. Two kinds of chemical methods, precipitation and adsorption with active carbon, have been developed for the Tc separation. The four group partitioning process, including Tc separation, will be demonstrated by using actual HLLW in the near future.