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高温ガス炉核的予測精度高度化のための研究開発,3; KUCAを用いたHTTR模擬炉心におけるRossi-$$alpha$$解析

R&D to improve accuracy of nuclear prediction for HTGR, 3; Rossi-$$alpha$$ analysis for HTTR simulated core in KUCA

中嶋 國弘*; 左近 敦士*; 高橋 和暉*; 芳原 新也*; 橋本 憲吾*; 深谷 裕司   ; 佐野 忠史*

Nakajima, Kunihiro*; Sakon, Atsushi*; Takahashi, Kazuki*; Hohara, Shinya*; Hashimoto, Kengo*; Fukaya, Yuji; Sano, Tadafumi*

京都大学臨界集合体実験装置(KUCA)のB架台に構築された黒鉛炉心体系においてAm-Be定常中性子源駆動下及び燃料固有の中性子源駆動下の中性子計数の時系列データを取得し、Rossi-$$alpha$$法による炉雑音解析を実施した。結果、Am-Be中性子源駆動下では中性子相関成分を観測することができなかったが、燃料固有の中性子源駆動下では明確な相関成分が観測され、即発中性子減衰定数を求めることができた。

Time series data of neutron detector was obtained under Am-Be steady neutron source driven condition and neutron source from fuel in the graphite core system configured on B rack of the Kyoto University Critical Assembly (KUCA), and the reactor noise analysis with Rossi-$$alpha$$ method was performed. As a result, neutron correlation component could not be observed under Am-Be neutron source driven condition, but a significant correlation component was observed under fuel neutron source driven condition, and prompt neutron decay constant could be determined.

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