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Development of a non-destructive post-irradiation examination technique using high-energy X-ray computer tomography

高エネルギーX線CTを利用した非破壊照射後試験技術の開発

勝山 幸三 ; 永峯 剛; 中村 保雄

Katsuyama, Kozo; Nagamine, Tsuyoshi; Nakamura, Yasuo

本研究では、X線CT技術を照射済燃料集合体の非破壊試験に適用し、新しい非破壊検査技術を確立した。照射済燃料集合体からの$$gamma$$線放出の影響を低減するため、パルス状に高エネルギーX線を発生させ、それと同期した検出システムを採用した。これによって鮮明な画像を得るとともに、断層画像,3次元画像を得ることにも成功した。この画像により、これまで破壊試験でしか得られなかったデータをも非破壊試験で取得できることになり、作業効率の向上,放射性廃棄物の発生の低減化にも貢献できる。

High-energy X-ray computer tomography (X-ray CT) is one of the most powerful non-destructive test tools for checking the inner condition of structure materials. This technique has been applied to the inspection of structure materials such as the booster rocket and the engine of automobile. However, the application of X-ray CT technique to the post irradiation examination (PIE) of nuclear reactor fuel was impossible due to the effects of $$gamma$$ ray emissions from an irradiated fuel assembly. In order to minimize the effects of the $$gamma$$ ray emissions from the irradiated fuel assembly, the 12 MeV X-ray pulse was used in synchronization with the switch-in of the detector, and then clear cross section CT image could be successfully obtained. This technique makes it possible to observe the inner condition of irradiated fuel assembly (maximum radioactivity:2$$times$$10$$^{16}$$Bq) by non-destructive method for the first time in the world.

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