PHWR Modelling and Simulation Issues for SAM Enhancement in Korea after Fukushima

Abstract

Severe Accident Management (SAM) strategies can typically be grouped into three categories such as (1) coolant injection, (2) containment condition control, and (3) fission product release control. After Fukushima, enhancements in SAM strategies and measures are under way in Korean PHWR plants corresponding to those categories by adding (1) new injection paths, (2) passive autocatalytic recombiners (PARs) for hydrogen control, (3) containment filtered vent system (CFVS) for overpressurization control, and (4) new SAM strategies in SGTR (Steam Generator Tube Rupture) bypass events for source term control. New modellings for these are being integrated into SAM simulation aid, called SAMEX-CANDU, in Korea.