When the hot molten core comes into contact with the water in the reactor cavity a steam explosion can occur. The steam explosion might be triggered during some scenarios of severe nuclear reactor accidents, when extremely hot molten nuclear fuel interacts with the coolant water. A highly energetic steam explosion in a nuclear power plant could cause the containment failure and the release of radioactive fission products to the environment. The purpose of the performed analysis is to provide a first estimation of the expected pressure loadings on the typical PWR cavity structures during a steam explosion. To achieve this, the fit-for-purpose steam explosion model is proposed, followed by a Computational Fluid Dynamics (CFD) analysis. In the present work two steam explosion scenarios in the partially flooded Pressurized Water Reactor (PWR) cavity were simulated with the general purpose code CFX-5  to estimate pressure loadings on cavity walls.
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Modeling of Steam Explosion in Partially Flooded PWR Reactor Cavity
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Koncˇar, B, Leskovar, M, & Cizelj, L. "Modeling of Steam Explosion in Partially Flooded PWR Reactor Cavity." Proceedings of the ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. Heat Transfer: Volume 2. San Francisco, California, USA. July 17–22, 2005. pp. 477-485. ASME. https://doi.org/10.1115/HT2005-72479
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