Setpoint analysis of POSRV for KNGR

In accordance with adoption of POSRV, as a safety valve to protect overpressure of reactor coolant system for KNGR, the sensitivity study were performed to determine the actuation setpoint of POSRV. The results of the sensitivity studies for the loss of condenser vacuum and the inadvertant opening of POSRV were described in this paper. Various actuation setpoint of POSRV were assumed for sensitivity study in conjunction with initial conditions, that is, the core inlet temperature, reactor coolant flow, pressurizer pressure and level, and steam generator water mass. The actuation setpoint of POSRV was determined so that the results of these sensitivity studies under the most conservative conditions could meet the acceptance criteria (below 110% of design pressure and above the specified acceptable fuel design limit) and it was verfied that the design of POSRV was pertinent to KNGR