Failure of a heat transfer tube and sodium-water chemical reaction is postulated as a safety evaluation event unique to sodium-cooled fast reactors. As one of the evaluation methods, a computer program called SERAPHIM has been developed to calculate compressible multicomponent multiphase flow with sodium-water chemical reaction. Evaluation of a reacting jet under a large-scale water leak needs to consider a substantial number of heat transfer tubes. This makes it difficult to perform sensitivity analysis due to its calculation time even in the case of using parallel computing. In this study, a porous model representing the effect of the tube bundle is incorporated into the code to reduce the number of mesh division. The model is tested through the analysis of the experiment on water discharging into the liquid sodium. The analysis showed that the flow resistance is represented by the model in a course mesh. On the other hand, we concluded that the mixing effect of gas and liquid phase should be considered to represent the high-temperature region.
UCHIBORI et al. (Wed,) studied this question.
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