[en] In this analysis, comparison of mitigating procedure when SGTR occurs between shutdown condition and full power condition was performed. In shutdown condition, the core uncovery would not take place in 16 hours whether the cooling procedures are performed or not. Therefore, the integrated amount of break flow should be considered only. In this point of view, cooling through intact SG only, case 3, is the best way to minimize the amount of break flow. In full power condition, the core water level is changed due to high reactor power. The important thing to protect NPP is to keep core water level. Although the break flow rate is smaller when no HPSI is injected, the core water level decreases continuously so that HPSI injection is inevitable. It is expected that SGTR EOP should be prepared for different mode of NPP, for instance, shutdown or full power.