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X線CTデータを用いた高速炉燃料ピンの曲がり測定及びその解析

Measurement and Analysis of the Fuel Pin Deflection Irradiated in Fast Reactor using the X-Ray CT Image

勝山 幸三; 永峯 剛; 松元 愼一郎

Katsuyama, Kozo; Nagamine, Tsuyoshi; Matsumoto, Shinichiro

高速実験炉「常陽」で照射した炉心燃料集合体のX線コンピュータトモグラフィ試験(以下CT試験)を実施し、得られたCT断面像から集合体内の燃料ピンの曲がり量を計算コードの結果と比較評価した。この結果、集合体の外周に装荷された燃料ピンの曲がり傾向は、内部の燃料ピンと比較すると大きく、ラッパ管側へ変位していることが確認された。

In order to evaluate the irradiation behavior of fuel pin, X-ray CT test was carried out for the fuel assembly irradiated in the experimental fast reactor Joyo and fuel pin deflection were measured based on the analysis of CT image. It was observed that the deflection of the fuel pins loaded in the outermost array of the fuel assembly were large as compared with the fuel pins loaded in the inner region and the fuel pins fuel situated fronting on wrapper tube were markedly displaced in the direction of wrapper tube.

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