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In order to optimize the radioactive waste treatment in the nuclear fuel cycle, partitioning and transmutation (i.e. PT e.g. 2.4 × 10, 4.3 × 10 and 2.1 × 10 years for Pu, Am and Np, respectively. Among FPs concerned, Tc, Pd, Se and Te are long-lived fission products (LLFP), and Ru, Rh, Pd, Tc, Se and Te are precious and rare metal fission products (RMFP). The half-life of Tc is as long as 2.1 × 10 years. By considering its fate, utilization with and without transmutation (Tc (n,γ)Tc → β → Ru(stable)) are pictured in the future. Typical amounts of FP estimated by calculations with the ORIGEN-II code are shown in Table 1. Amounts of RMFP generated are proportional to burnup of the fuel, and spent mixed oxide (MOX) fuel, highly irradiated in fast reactor (burnup: 150 GWd/t, cooling time: 4 years), will contain more than 30 kg of RMFP per metric ton.

Separation and Utilization of Tc and Other Rare Metal Fission Products by an Extended Aqueous Reprocessing