Emergency Strategy Research of MSLB Accident with Loss of Passive Residual Heat Removal for Small Modular Reactor

This paper researched the behavior of main steam line break (MSLB) accident with loss of passive residual heat removal (PRHR) of small modular reactor (SMR) in case of full power with RELAP5-3KEYMASTER code. Cooldown and depressurization by the mode of automatic depressurization system (ADS) and passive core cooling system are calculated post-accident. The variation of main parameters post-accident and the accident advancement and results have been analyzed. Operation intervention is given and the effects with it are discussed. And the emergency strategy for development and verification of emergency operating procedures (EOP) is given.