Analysis of Secondary Emergency Passive Heat Sink’s Ability to Relieve Accident of CPR1000

The transient thermal hydraulic characteristics of CPR1000 were analyzed using RELAP5/MOD3.4 to verify the capability of the adopting aircooled heat exchanger’s emergency passive heat sink (EPHS) for accident mitigation under the condition of feedwater line break (FLB). The calculation results show that the EPHS of CPR1000 can supply the water to steam generator immediately and remove the core residual heat after the FLB successfully. Therefore, it demonstrates that the design of the EPHS of CPR1000 is successful.