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Report No.

Advanced ORIENT cycle, toward realizing intensified transmutation and utilization of radioactive wastes

Ozawa, Masaki; Koyama, Shinichi ; Suzuki, Tatsuya*; Fujita, Reiko*; Mimura, Hitoshi*; Fujii, Yasuhiko*

To minimize the ecological burden originating in nuclear fuel recycling, a new R&D strategy, Adv.-ORIENT (Advanced Optimization by Recycling Instructive ElemeNTs) cycle, was set forth. A key separation tool is ion exchange chromatography (IXC) by a tertiary pyridine resin having soft donor nitrogen atoms. This method has provided individual recovery of pure Am and Cm products with a Pu/U/Np fraction from irradiated fuel in just a 3-step separation. A catalytic electrolytic extraction (CEE) method by Pd$$_{adatom}$$ has been employed to separate, purify and fabricate RMFP catalysts. High separation efficiency of RMFP proved hydrochloric acid as a suitable media for their recovery. Different functioned ion exchangers, e.g., ammonium molybdophosphate (AMP), have been investigated for the separation of Cs$$^{+}$$. Theoretical and laboratory studies on the isotope separation of LLFPs were begun for $$^{79}$$Se, $$^{126}$$Sn and $$^{135}$$Cs.



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