Development of design technology on thermal-hydraulic performance in tight-lattice rod bundle, 3; Numerical estimation on rod bowing effect based on X-ray CT data

稠密格子燃料集合体熱流動設計技術開発,3; X線CTデータを用いた燃料棒曲がりによる影響の解析的評価

三澤 丈治; 大貫 晃; 光武 徹*; 勝山 幸三 ; 三澤 進*; 永峯 剛; 中村 保雄; 秋本 肇

Misawa, Takeharu; Onuki, Akira; Mitsutake, Toru*; Katsuyama, Kozo; Misawa, Susumu*; Nagamine, Tsuyoshi; Nakamura, Yasuo; Akimoto, Hajime

In this study, the rod positions in the rod bowing test section were measured using the high energy X-ray computer tomography (X-ray-CT). Based on the measured rod positions data, the subchannel analysis by the NASCA code was performed, in order to investigate applicability of the NASCA code to BT estimation of the rod bowing test section, and influence of displacement from design-based rod position upon BT estimation by the NASCA code.