Evaluations of fission product reduction strategies for severe accident management in CANDU6

This paper presents the mitigation effects of fission product reduction strategies that can be applied to severe accident management for CANDU6 plants. Strategy effects for 'control of the reactor building condition' and 'reduction of the fission product release' have been evaluated. The operations of a dousing spray system, local air cooler system, and containment filtered vent system are simulated as severe accident management strategies. The present analysis is mainly focused on determining an estimate of the fission products in the release and transport processes, i.e., (1) their release from the reactor core, (2) their distribution in a primary heat transport system, calandria vessel, molten corium, and reactor building, and (3) their release from the reactor building into the environment during a severe accident.