An analysis of containment DBA Pressure/Temperature with an analytical condensation model

In nuclear power plant, the containment building is used to isolate radioactive materials at postulated accident conditions as last barrier. Thus, the containment integrity should be kept under any conditions. Due to the complex thermohydraulic behavior in containment building, however, accurate analysis for containment temperature/pressure has many difficulties. In particular, condensation heat transfer phenomena which have large roles to sur press temperature/pressure in containment have large uncertainties as insufficient research. In this study, an analytical model on condensation model is developed and investigated its effects with application to containment temperature/pressure of design basis accident conditions. In this study, the calculation results show that the containment temperature/pressure is remarkably lower than previous results, but, the peak pressure has little difference. This is due to the decrease of heat absorption rate by heat structures as time increasing