Preliminary safety analysis of the PWR with accident-tolerant fuels during severe accident conditions

•Analysis of severe accident scenarios for a PWR fueled with ATF system is performed.•A large-break LOCA without ECCS is analyzed for the PWR fueled with ATF system.•Extended SBO cases are discussed for the PWR fueled with ATF system.•The accident-tolerance of ATF system for application in PWR is illustrated. Experience gained in decades of nuclear safety research and previous nuclear accidents direct to the investigation of passive safety system design and accident-tolerant fuel (ATF) system which is now becoming a hot research point in the nuclear energy field. The ATF system is aimed at upgrading safety characteristics of the nuclear fuel and cladding in a reactor core where active cooling has been lost, and is preferable or comparable to the current UO2–Zr system when the reactor is in normal operation. By virtue of advanced materials with improved properties, the ATF system will obviously slow down the progression of accidents, allowing wider margin of time for the mitigation measures to work. Specifically, the simulation and analysis of a large break loss of coolant accident (LBLOCA) without ECCS and extended station blackout (SBO) severe accident are performed for a pressurized water reactor (PWR) loaded with ATF candidates, to reflect the accident-tolerance of ATF.