Abstract: The steam condensation on the inside wall of containment and film evaporation on the outside wall of containment are very important phenomena during passive containment cooling system (PCS) heat removal process. The GOTHIC8.0 code was used to simulate condensation and evaporation heat removal processes in this paper. The code prediction results were compared and evaluated based on experimental data of condensation and evaporation tests. The results show that the condensation model in GOTHIC can simulate steam condensation heat transfer process quite well. The film evaporation rate from GOTHIC model is lower than that from evaporation test. Although GOTHIC model is conservative to analyze containment response during design benchmark accident, it is suggested that further work should focus on making code development to better simulate film evaporation phenomenon.