Abstract
A new molten core model was developed to simulate the pre-mixing process of steam explosions in severe accidents at light water reactors. The phenomena considered here involves disintegration of a molten core jet dropping into a coolant pool and mixing of the melt droplets with the coolant. The model consists of a jet, particles and a pool of molten core, and also coupled with a two-phase flow code ACE-3D which solves the surrounding coolant flow field. The basic capability of the presentmodel in handling the phenomena considered was tested by simulating a molten metal jet breakup experiment. The calculation result showed that the model can reproduce the phenomena observed in the experiment well.
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