Numerical analysis of 1/28 scaled NGNP HTGR reactor building test facility response to depressurization event using GOTHIC

In this study, generation of thermal hydraulic information in containments (GOTHIC) model of a 1/28-scaled simplified test facility was developed to analyze the depressurization scenarios and validate them against experimental data. Natural leakage from the test facility was modeled using two different methods. The post-depressurization refill of air into the test facility compartments along with two hypothetical depressurization scenarios were analyzed and compared with experimental data. In general, simulation results were observed to be consistent with the experimental data.