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Model improvement of the simmer-iii fast reactor safety analysis code to freezing phenomena for molten core materials

Kamiyama, Kenji  

In this study, model improvement of SIMMER-III code is presented which is based on the knowledge of metallurgy area consisting of the microstructure observation of solodofoed materials. The formation of supercooling layer in the vicinity of wall surface and the imperfect contact of melt to the wall were confirmed. Some applications to freezing tests showed that the temperature of supercooling layer dominated the rate of bulk enthalpy loss and it was specific to each material. Thus, in order to increase the applicability and accuracy of SIMMER-III code for freezing phenomena in CDA, a new correlation was proposed in this study to predict the temperature of supercooling layer in the vicinity of wall.

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