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孫 昊旻; Leblois, Y.*; Gelain, T.*; Porcheron, E.*
Journal of Nuclear Science and Technology, 59(11), p.1356 - 1369, 2022/11
被引用回数：0 パーセンタイル：0.01(Nuclear Science & Technology)PWRのシビアアクシデントシナリオにおいて、格納容器内エアロゾル状放射性物質の除去・保持のために、格納容器スプレイを用いることができる。そのために、高精度な除去効率の予測は安全評価上重要である。PWRの格納容器スプレイでは、84%-95%と高いスプレイカバー率が要求されるのに対して、既往研究では、そのような高いカバー率におけるエアロゾル除去実験はかなり限られている。本論文では、カバー率に着目し、スプレイによるエアロゾル除去現象の理解と除去効率評価モデル高度化のために、大型容器において実機相当のカバー率を有する体系のエアロゾル除去実験を実施し、詳細なエアロゾルと液滴特性の計測結果から除去特性を調査した。また、MELCORの除去モデルと実験結果を比較し、粒子径に対する除去効率の傾向が再現でき、大きい粒子径に対して過小評価となるものの、最小除去効率を有する小さい粒子径(
0.52
m)において良好な一致が得られることを示した。
孫 昊旻; Leblois, Y.*; Gelain, T.*; Porcheron, E.*
Proceedings of 2020 International Conference on Nuclear Engineering (ICONE 2020) (Internet), 11 Pages, 2020/08
During a severe accident of PWR, fission products (FPs) may be released. Containment spray can be utilized to remove the aerosols of FPs. Therefore, it is important to develop an analytical model for predicting aerosol removal efficiency. The containment spray has high spray coverage ratio where the droplets are expected to impact side walls. In such condition, the gas flow induced by droplets will behave differently from that without droplet impaction where a stable gas circulation is expected. Since the aerosol removal efficiency depends on gas flow, to develop the removal model for the containment spray from this viewpoint, several experiments were carried out in TOSQAN facility. It was confirmed that the spray coverage ratios were comparable to that of the containment spray and many droplets impacted side wall. Aerosol removal was found to be more effective in higher spray water flow rates. Aerosol concentration decay calculated by CFD was in agreement with measured one.
