Evaluation of the Heat Removal Performance of the Passive Containment cooling System using MARS-KS with an Empirical Condensation Correlation

The heat removal performance of the Passive Containment Cooling System (PCCS) is an important factor for the integrity of the containment. In this study, the heat removal performance of the conceptual PCCS design is evaluated by using MARSKS 1.4. After the simulation, the result of this study is compared with the Lim's data for validation. An empirical condensation correlation is applied to the MARS-KS to replace the embedded condensation model by Colburn and Hougen. The heat removal performance of the conceptual PCCS design was modeled by using MARS-KS 1.4. The result of this study was compared with the Lim's data for validation. The empirical condensation correlation was applied to the MARS-KS for evaluation of the existence condensation model. The overall trend is analogous to Lim's data but the difference between the data was started after about 100 seconds. It happens two reasons: condenser tube length and the total heat removal capacity of PCCS. At the beginning of the event, the heat removal rate by PCCS in the MARS-KS result shows the good performance compared with that of MARS-KS with empirical correlation until 40 seconds. However, the heat removal rate by PCCS in the result of MARS-KS with empirical correlation is more helpful to decrease the pressure in the containment due to the empirical condensation correlation which is derived from the experimental results. This study will be a good option to determine the realistic heat removal capacity of the PCCS.