Optimization of safety injection system design for Korean standard nuclear power plant

A series of scoping analyses have been performed, using safety analyses methodology approved from regulatory authorities, for the safety injection system (SIS) of Korean standard nuclear power plant (KSNP) to optimize the designs of the high pressure safety injection pump (HPSIP), the low pressure safety injection pump (LPSIP) and the safety injection tank (SIT). The result of these analyses provides the possibility of reducing the SIS down 75% of current capacity subject to design changes such as adopting a 3-train power operated safety relief valve (POSRV) system on the pressurizer for HPSIP, and increasing capacity of the heat exchanger of the shutdown cooling system (SCS) or relaxing the design requirements of nuclear steam supply system (NSSS) for LPSIP