Abstract
This paper describes development of the detailed and phenomenological numerical simulation code named JUPITER for predicting the molten core behavior including solidification and relocation based on the three-dimensional multiphase thermal-hydraulic simulation models to precisely investigate molten core relocation behavior in the Fukushima-Daiichi nuclear power plant. In order to distinguish nuclear fuel from core internals in the JUPITER, we added the multicomponent analysis method to the JUPITER and carried out to check its effectiveness. From the present numerical results, it was confirmed that a newly developed multicomponent analysis method appropriately can predict the relocation behavior of molten materials in complicated structures, that is relocation and solidification behavior for fuel components with the heat source and the core internals without heat sources from simplified fuel assemblies through the core support plate and simplified control rod guide tubes to the lower head in the RPV.
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