Abstract: Advanced passive PWR adopts passive containment cooling system (PCCS) to maintain containment integrity during postulated accident, including water film cooling induced by gravity water spray and air conviction heat transfer in air cooling channels. The performance of PCCS during severe accident for advanced passive PWR was assessed using integrated safety analysis code. The analysis model including heat transfer models (conviction heat transfer and condensation/evaporation heat transfer) of containment and PCCS, coupled with primary system model and engineered safety features model was built. These models were validated against the Westinghouse PCCS large-scale test results. The station blackout accident and hot leg small LOCA were selected. The accident process, primary system response, and containment response were calculated. PCCS performance was evaluated by containment pressure and temperature change under PCCS cooling. The result shows that containment pressure is controlled under design limit. Containment integrity is maintained in 72 h with PCCS water cooling.