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燃料ピンの再装荷を考慮した「常陽」炉心燃料集合体の解体手法の高度化

Establishment of the disassembling technique of the driver fuel assembly irradiated in JOYO

市川 正一; 芳賀 広行; 勝山 幸三 ; 前田 宏治  ; 永峯 剛

Ichikawa, Shoichi; Haga, Hiroyuki; Katsuyama, Kozo; Maeda, Koji; Nagamine, Tsuyoshi

FBRサイクル実用化研究(FaCT)の照射計画で燃料ピンを再装荷することが重要な照射オプションとして計画されている。炉心燃料集合体と同様の構造の集合体はノックバー固定タイプであり再装荷が従来できなかった。このため今回、燃料ピンの再装荷を考慮した「常陽」炉心燃料集合体の解体手法を高度化したので報告する。

Disassembling technique of the driver fuel assembly irradiated in the experimental fast reactor JOYO has been established at Fuel Monitoring Facility in JAEA. This technique made it possible to remove the fuel pins from the driver fuel assembly without the fuel pin sectioning. After disassembling the fuel assembly, some selected fuel pins can be reassembled into the new irradiation vehicle for the continuous irradiation at JOYO. This technique enables us to obtain the irradiation data of high burn-up fuel and high neutron dose material.

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