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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,2; KUCAを用いたHTTR模擬炉心における逆動特性解析

R&D to improve accuracy of nuclear prediction for HTGR, 2; Inverse kinetics analysis for HTTR simulated core in KUCA

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

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

京都大学臨界集合体実験装置(KUCA)のB架台においてHTTR模擬炉心を作成し、制御棒落下や中心架台落下実験を行い時系列データの取得を行った。取得された時系列データに対して逆動特性解析を行った結果、各検出器の位置依存性が確認された。更に、C1及び中心架台のように大きな反応度価値を有する場合、積分法と最小二乗逆動特性法の解析結果に有意な差異が確認された。

A Mock-up core for HTTR was configured on the B rack of the Kyoto University Critical Assembly (KUCA), and control rod and center core drop experiments were conducted to obtain time-series data. As a result of performing inverse kinetics analysis on the acquired time-series data, position dependency of each detector was confirmed. Furthermore, in the case with large reactivity worth, such as C1 and the central core, significant differences were found between the analysis results of the integration method and the least squares inverse kinetics method.

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