Overview of in-vessel retention concept involving level of passivity: with application to evolutionary pressurized water reactor design

摘要

In this work, one strategy of severe accident management, the applicability of the in-vessel retention (IVR) concept, which has been incor- porated in passive type reactor designs, to evolutionary type reactor designs, is examined with emphasis on the method of external reactor vessel cooling (ERVC) to realize the IVR concept in view of two aspects: for the regulatory aspect, it is addressed in the context of the resolution of the issue of corium coolability; for the technical one, the reliance on and the effectiveness of the IVR concept are mentioned.