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Development of disassembly & pin chopping technology for FBR spent fuels

使用済高速炉燃料集合体の解体及びせん断技術の開発

小林 嗣幸*; 難波 隆司*; 河辺 幸成*; 鷲谷 忠博 

Kobayashi, Tsuguyuki*; Namba, Takashi*; Kawabe, Yukinari*; Washiya, Tadahiro

日本原子力発電(JAPC)は日本原子力研究開発機構(JAEA)と共同でFBR実証炉燃料集合体の解体・せん断技術の開発を実施している。ここで開発する解体技術は機械式切断によるラッパ管切断を基本としたものであり、せん断技術としてはせん断後の燃料粉化率を高めるため短尺せん断技術を採用している。これまでに機械式切断要素試験として各種砥石によるラッパ管材の切断試験を行い切断工具の選定を行うとともに耐久性等の切断性能を把握した。また、解体後の燃料ピン束のハンドリング性能の評価として、搬送装置を試作しマガジン装荷性能等を確認した。本報ではこれらの研究開発成果について報告する。

Japan Atomic Power Company (JAPC) and Japan Atomic Energy Agency (JAEA) have been developing fuel disassembly and fuel pin chopping systems for a future Japanese commercial FBR. At first, the wrapper tube is cut by the slit-cut to pull it out, then the fuel pins are cut by the crop-cut at their end-plugs to separate them from the entrance nozzle. The pins are transferred to the magazine of the chopping machine. A series of tests were performed to develop this procedure. As the result of mechanical cutting tests, the CBN wheel was selected. The slit-cut tests were carried out to evaluated the cutting performance of the wheel. Fuel pin handling tests were performed to transfer them from the disassembly machine to the chopping machine. The Saucer tray was selected to receive the disassembled pins. All the pins were transferred and loaded into a magazine of the chopping machine.

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