New Decladding System in the Reprocessing Process for Fast Reactor Fuel

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山田 誠也; 鷲谷 忠博 ; 竹内 正行 ; 菅沼 隆; 青瀬 晋一

Yamada, Seiya; Washiya, Tadahiro; Takeuchi, Masayuki; Suganuma, Takashi; Aose, Shinichi

酸化物燃料の乾式再処理及び湿式再処理へ適用が可能な脱被覆技術の開発として、破砕工程、ハル燃料分離工程及びハル洗浄工程から構成される新しい前処理システムを開発した。本システムでは高Pu富化度の高速炉燃料にも適用可能なシステムであり、燃料の粉砕化が必須な乾式再処理プロセスでは枢要機器と考えられる。本報告では、この新たな脱被覆システム及び各工程の新型機器の概要について報告する。

As a part of the feasibility study on commercialized fast reactor cycle systems, Japan Nuclear Cycle Development Institute (JNC) has been developing the fuel decladding technology for the dry reprocessing process (oxide electrowinning process) and aqueous reprocessing process. Particularly, in the oxide electrowinning process, the spent fuel should be reduced to powder for quick dissolution in the molten salt at electrolyzer. Heat treatment method such as a voloxidation might not be applicable in the decladding process, because of the high plutonium content as fast reactor fuel. Therefore, JNC proposes new decladding system with innovative mechanical decradding devices. The decladding system consists of fuel crushing stage, hull separation stage and hull rinsing stage. In this paper, the outline of this new decladding system and its innovative devices will be descried.