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Development of nuclear instruments to measure power distribution of HTGR, 1; Development of ex-core detector

高温ガス炉出力分布測定のための核計装開発,1; 炉外検出器の開発

深谷 裕司  ; 沖田 将一朗  ; 中川 繁昭  ; 寺尾 剛*; 小池 昭史*

Fukaya, Yuji; Okita, Shoichiro; Nakagawa, Shigeaki; Terao, Tsuyoshi*; Koike, Akifumi*

日本原子力研究開発機構は、株式会社ANSeeN、静岡大学とともに、高温ガス炉の出力分布測定のための核計装の開発を実施した。このプロジェクトでは、高温ガス炉の炉心の高温環境を避けるため炉外計装の開発を行った。炉外計装は、中性子飛程の長い黒鉛減速の高温ガス炉とCT原理の特性を活かし出力分布測定を可能とする。この理論は、HTTR体系を対象とした計算及び、京都大学臨界集合体(KUCA)の臨界実験でも実証された。これらの技術は、他の炉型への応用も期待できる。

Japan Atomic Energy Agency, ANSeeN, and Shizuoka University has been conducted a joint-research to develop nuclear instrument for High Temperature Gas-cooled Reactor (HTGR) core power distribution. In the project, we developed the ex-core detector system to avoid heigh temperature environment of the HTGR core. The system achieves the measurement by taking advantage of the HTGR core feature of long flight length neutron due to the graphite moderated core with Computed Tomography (CT) technologies. The theory is demonstrated by calculation in HTTR (High Temperature Engineering Test Reactor) and criticality experiment in KUCA (Kyoto University Criticality Assembly). These technologies are expected to be applied to other reactors.

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