Evaluation of corium behavior in the lower plenum of the reactor vesseln during a severe accident

摘要

Corium behavior in the lower plenum of the reactor vessel during a severe accident is very important, because this affects the failure mechanism of the lower spherical reactor vessel and the thermal load to the outer reactor vessel under the IVR-ERVC (in-vessel corium retention through external reactor vessel cooling). A detailed analysis of the in-vessel melt progression during a SBLOCA(small break loss of coolant accident) without the SI (safety injection) of the APR (advanced power reactor) 1