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Report No.
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Adv.-ORIENT cycle; Its scientific progress and the engineering feasibility

Ozawa, Masaki; Suzuki, Tatsuya*; Koyama, Shinichi ; Yamagishi, Isao ; Fujita, Reiko*; Okada, Ken*; Tatenuma, Katsuyoshi*; Mimura, Hitoshi*; Fujii, Yasuhiko*

Feasibility studies on Adv.-ORIENT Cycle are progressed allowing to use hydrochloric acid as well as nitric acid. Tertiary pyridine resin enabled to separate MA/Ln and then Am/Cm precisely from the irradiated nuclear fuel, and very pure Am and Cm products were recovered. Catalytic electrolytic extraction of RMFP(Rare Metal Fission Product) was verified. RMFP-deposit electrodes made from simulated HLLW showed high catalytic reactivity on electrolytic production of hydrogen. Hastelloy-B and Ta were confirmed their anti-corrosiveness in highly concentrated hydrochloric acid media. Thermo-chemical stability for Tertiary Pyridine Resin was verified in either HCl or HNO$$_{3}$$ media toward its practical use in the reprocessing. The separation and utilization of RMFP in spent fuel would not only open a new direction in fuel cycle mission, but also improve the existing process performance of reprocessing, vitrification and the repository tasks.

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