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高速中性子直接問いかけ法の燃料デブリへの適用性検討,2; 非破壊測定装置の基本設計

Investigation on applicability of fast neutron direct interrogation method to fuel debris, 2; Basic design of non-destructive measurement system

前田 亮; 古高 和禎; 呉田 昌俊; 大図 章; 飛田 浩; 春山 満夫; 米田 政夫; 服部 健太朗

Maeda, Makoto; Furutaka, Kazuyoshi; Kureta, Masatoshi; Ozu, Akira; Tobita, Hiroshi; Haruyama, Mitsuo; Komeda, Masao; Hattori, Kentaro

原子力機構では、燃料デブリの有望な非破壊測定技術として期待されている核分裂性核種(Fissile)の総量を計測する技術である高速中性子直接問いかけ法(FNDI法)に着目して、燃料デブリを収納した容器内のFissile量の測定に適用できるかどうかの可能性について検討を開始した。本報では、モンテカルロ解析コードPHITSや新たに開発した可視化ツールを用いた非破壊測定装置の基本設計の現状と、中性子拡散特性の3次元時系列可視化結果について報告する。

We have developed the fast neutron direct interrogation, FNDI, method which measures the total amount of the fissile in fuel debris expected as promising nondestructive measurement technology. And we started examination about the possibility of whether to be applicable to measurement of the amount of fissile in the container which stored the fuel debris. In this report, the progress about the basic design of non-destructive measurement system which has been designed by using Monte Carlo code PHITS and newly developed visualization tools, and also the 4D visualization results of neutron diffusion characteristic in the system are reported.

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