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

CPFにおける乾式再処理法に関するJAEA-CRIEPI共同研究の最近の進捗

北脇 慎一 ; 仲吉 彬 ; 福嶋 峰夫 ; 小泉 務; 倉田 正輝*; 矢作 昇*

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

原子力機構は、電力中央研究所と共同で金属電解法乾式再処理開発を東海CPFにおいて実施している。U試験を2002年から開始し、2008年までにMOX試験までを終了した。U試験では、UO$$_{2}$$ペレットの還元,還元物の電解,電解析出物に付着する塩化物の蒸留分離と析出物のインゴット化を行い、99%の回収率でUを金属として回収した。PuO$$_{2}$$を用いた試験でも同様にPu金属をUとともに回収した。MOX試験では、Puの物質収支が$$sim$$100%で維持されることを確認した。現在U-Pu-Zr合金の調整中であり、2009年以降は合金を用いた試験を継続する。

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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