Transactions of the Korean Nuclear Society Virtual Autumn Meeting December 17-18 Numerical Analysis of Algebraic Heat Flux Model in a Rectangular Cavity (original) (raw)

For the past decades, many researchers have been focusing in the area of severe accident in nuclear power plants, which has notable impacts in environment. One of its causes is long absence of the core cooling, which results to overheating and the possibility of relocation of melt pool to the lower plenum of reactor vessel. Corium, the molten mixture, can be stratified with a metallic layer coming from debris particles of reflector, steel, iron and zircaloy, above an oxide layer which is made up of ZrO2 and UO2. Heat transfer phenomena and fluid behavior in these layers play a vital role for the vessel integrity. One of which is natural convection involving internal heat source. The complexity of phenomena occurring inside the corium requires high-fidelity numerical simulation, as various CFD researchers take account into the unsteadiness of the flow, near-wall modelling, constant transition of the boundary layer regions, and lastly the turbulent kinetic energy production due to the...

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