Safety Analysis of ATWS Events for PGSFR

The PGSFR (Prototype Gen-Ⅳ Sodium-cooled Fast Reactor) consists of the PHTS (Primary Heat Transport System), the IHTS (Intermediate Heat Transport System), and the DHRS (Decay Heat Removal System). Four events of Unprotected Transient Over-Power (UTOP), Unprotected Loss OF Flow (ULOF), Unprotected Loss Of Heat Sink (ULOHS), and Unprotected Station Black-Out (USBO) are selected as representative events for the Anticipated Transient Without Scram (ATWS). Safety analysis of four representative ATWS events are carried out with MARS-LMR code. Safety analysis of four representative ATWS events has been implemented using MARS-LMR code. As a results, the peak assembly outlet temperatures fulfill the safety acceptance criteria.