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Sahboun, N. F.; 松本 俊慶; 岩澤 譲; Wang, Z.; 杉山 智之
Annals of Nuclear Energy, 195, p.110145_1 - 110145_12, 2024/01
被引用回数：0 パーセンタイル：0.01(Nuclear Science & Technology)Relocated corium into the Primary Containment Vessel needs to be properly cooled to avoid or mitigate molten core concrete interactions in the PCV in order to maintain its supporting capability for the reactor pressure vessel and to suppress combustible or non-condensable gas releases. To know how effective the cooling is, it became important to know the geometry of the relocated corium. The present study chooses to focus on the "Wet Cavity" strategy and to build a reliable tool to evaluate the corium coolability in such a case. To achieve this goal, a previously developed formulation built to predict the corium geometry under the "Dry Cavity" strategy was extended to the conditions used in the "Wet Cavity" strategy. This extension includes the effect of solidification and cooling from the water by using a newly developed expression for the dimensionless thickness s, the water subcooling, and the melts super heat. After the validation of the extended formulation was confirmed, potential restrictions and limitations were investigated.
Sahboun, N. F.; 松本 俊慶; 岩澤 譲; 杉山 智之
Proceedings of Asian Symposium on Risk Assessment and Management 2021 (ASRAM 2021) (Internet), 15 Pages, 2021/10
The accident at the Fukushima Daiichi Nuclear Power Station triggered reevaluation and necessary enhancement of the accident countermeasures and safety regulations worldwide. Such actions are based on the present knowledge and evaluation techniques of the important phenomena anticipated to occur in a severe accident. The present study focused on the under-water melt spreading behavior and aimed at a formulation to predict the final geometry of the solidified melt on the floor of the containment vessel. The formulation, based on the author's previous study of the dry spreading of molten metal, considers the thermal and fluid properties of the melt, so the gap between the core and simulant materials could be filled by using adequate properties. In addition, the formulation was extended to the wet condition by considering the film boiling heat transfer at the upper side of the spreading melt. The improved formula was applied to the PULiMS experiments conducted by the Swedish Royal Institute of Technology with a simulant oxide material under wet conditions. The predicted final spreading area and thickness were in agreement with the experimental results within a twenty percent error.
