Analysis of loss of coolant accident without ECCS and DHRS in an integral pressurized water reactor using RELAP/SCDAPSIM

Small Modular Reactors (SMRs) are currently being developed and licensed in many countries. The innovations the designs provide significant features, such as decreased construction cost time, enhanced safety, modularity, possibility of factory production etc. Several new SMR based on concept an integral Pressurized Water Reactor. One designs, namely NuScale was selected for this analysis. An input model from scratch RELAP/SCDAPSIM code using publicly available data Final Safety Analysis Report provided by U.S. NRC some validation tests have already been conducted. extremely severe event is analyzed discussed current work. It inside containment Loss Coolant Accident followed failure both Emergency Core Cooling System Decay Heat Removal System. simulation conducted 86400 s (24 h) with core damage starting after ~4.8 h, which comparable to results similar scenarios presented references.