Abstract
In this paper, the integrated, transient analysis model of IVR for AP1000 is built to evaluate the transient performances and thermal safety margins. In the conservative scenario, the molten pool behavior can be divided into two phases according to the melting process of the lower core support plate, as transient molten pool and stable molten pool. In the phase of the transient molten pool, before the melting of the lower core support plate, the peak heat flux along the RPV wall is about 1.7 MW/m2 at nodes 17–21 resulting in with only 14% thermal safety margin caused by the heat focusing effect of the light metal layer. The thermal focusing effect is effectively alleviated due to the melting of the lower core support plate with a 50% thermal safety margin after the formation of the stable molten pool.
Published Version
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