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Report No.

Recent progress of JAEA-CRIEPI joint study for metal pyroreprocessing at CPF

Kitawaki, Shinichi ; Nakayoshi, Akira ; Fukushima, Mineo ; Koizumi, Tsutomu; Kurata, Masaki*; Yahagi, Noboru*

JAEA is developing the pyroreprocessing by collaboration with CRIEPI. The test using U began in 2002, and the test using PuO$$_{2}$$ and unirradiated MOX were ended in 2008. The reduction of UO$$_{2}$$ pellets by using Li-reduction method, the electrowinning using reduced pellets, the separation of adhered salt with deposit by distillation, and the ingot formation of deposit were performed. As a result, 99% of the loaded U is recovered as metal ingot. The tests similar to U tests were performed by using PuO$$_{2}$$. As a result, Pu was successfully recovered with U metal. In the MOX test, the mass balance of Pu was maintained at $$sim$$100% with respect to the initial amount. We try to form the U-Pu-Zr alloy by using reduced MOX. After 2009, the process development that uses the alloy will be continued.



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