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Numerical simulation of natural circulation experiment under asymmetric cooldown using LSTF

LSTFを用いた非対称冷却自然循環実験の数値解析

石垣 将宏; 渡辺 正*

Ishigaki, Masahiro; Watanabe, Tadashi*

2011年にOECD/ROSA-2プロジェクトの一環として自然循環実験を行った。事故時において蒸気発生器(SG)の2次側の冷却材を喪失した場合、異常側SGにおける循環が停止する可能性がある。実験では片側SGの2次側を空にし、健全側SGの2次側を階段状に減圧した際の自然循環挙動の計測を行った。本研究ではこのLSTFによる自然循環実験をTRACEコードにより解析を実施した。解析の結果、健全側ループの循環流量は実験よりもわずかに過小評価し、異常側ループの流量を過大評価した。さらに冷却率に対する自然循環挙動の感度解析も実施した。

When coolant in one of the secondary side of steam generator (SG) is lost under some accident condition, the NC in the loop with the affected SG may terminate. Hence, the experiment was done in order to discuss the behavior of the natural circulation flow when the secondary side of the intact SG was depressurized stepwisely and that of the affected SG was empty of coolant. In this paper, we analyzed this NC experiment using the LSTF by the TRACE code. The objective of this analysis is to clarify the sensitivity of the code to the NC behavior. The calculated mass flow rate in the intact loop was slightly underestimated compared with the experimental result. On the other hand, the calculated mass flow rate in the affected loop was overestimated compared with the experimental result. In addition, we did the sensitivity analysis of the NC behavior in the case that the cooldown rate was changed.

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