System performance test of mechanical decladding system for FBR fuel reprocessing

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小泉 健治 ; 鷲谷 忠博 ; 青瀬 晋一

Koizumi, Kenji; Washiya, Tadahiro; Aose, Shinichi

サイクル機構では、高速炉酸化物燃料の再処理プロセスにおける新しい前処理技術として、機械式脱被覆システムを開発している。模擬燃料ピン(SUS316製被覆管+アルミナ製燃料ペレット)を用いた基礎試験を実施し、各工程機器(機械式粉砕装置、分級搬送装置、磁気分離装置、溶融分離装置)の基本性能として破砕刃物耐久性、ラッピングワイヤ及び燃料分離性能を確認するとともに、システムとしての成立性を確認した。

JNC has been developing the mechanical decladding system for FBR oxide fuel. The mechanical decladding system is consists of the fuel pin crushing step(mechanical crusher), the hull separation step(magnetic separator) and the hull rinsing step(melting separator). The system mock-up test device is fabricated, and the system performance tests are carried out with simulated oxide fuel pins. As the results, the basic performance of each device and system performance were confirmed. The longevity of the crushing blades of mechanical crusher is one year or more and practical use. The majority of wrapping wire can be separated by the vibration classifier. High fuel purity and a high fuel separation efficiency are obtained by the multi-stage magnetic separator. An efficient fuel recovery is possible according to the CCLM technology. In the future, the positive proof data that uses the spent fuel will be obtained, and the design for the remote maintenance will be verified.