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Development of the ERIX process for reprocessing spent FBR-MOX fuel; A Study on minor actinides separation process

ERIXプロセスによる高速炉燃料再処理システム技術開発; マイナーアクチニド分離工程の研究

星 陽崇*; Wei, Y.*; 熊谷 幹郎*; 朝倉 俊英; 森田 泰治

Hoshi, Harutaka*; Wei, Y.*; Kumagai, Mikio*; Asakura, Toshihide; Morita, Yasuji

核燃料サイクルの開発において、再処理プロセスの経済性及び効率性の向上は最も重要な課題の一つである。特に将来の高速増殖炉システムの確立には、現行のPurexプロセスに比べコンパクトで放射性廃棄物量の少ない再処理プロセスの開発が強く望まれている。著者らは使用済みFBR-MOX燃料の再処理プロセスとして、新規湿式再処理プロセス「ERIXプロセス」を提案している。本プロセスは(1)陰イオン交換体によるPd除去工程,(2)電解還元による原子価調整工程,(3)陰イオン交換体によるU, Pu, Npの回収工程,(4)マイナーアクチニド分離工程から構成される。本研究ではマイナーアクチニド分離工程について検討した。

For the development of nuclear fuel cycle, it is one of the most important tasks to improve reprocessing more economically and efficiently. Especially, to establish the Fast Breeder Reactor (FBR) cycle system for the future, it is strongly desirable to develop a new reprocessing which uses more compact equipments and produces less radioactive wastes compared to the present PUREX process. For this purpose, we have proposed a novel aqueous reprocessing system named ERIX Process to treat spent FBR-MOX fuels. This process consists of (1) Pd removal by selective adsorption using a specific anion exchanger; (2) electrolytic reduction for the valence adjustment of the major actinides including U, Pu, Np and some fission products (FP) such as Tc and Ru; (3) anion exchange separation for the recovery of U, Pu and Np using a new type of anion exchanger, AR-01; and (4) selective separation of long-lived minor actinides (MA = Am and Cm) by extraction chromatography. In this work, MA separation process was studied.

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