Super Critical Water Reactor (SCWR) is one of the six types of nuclear reactors proposed by Generation 4 International Forum (GIF), whose technology is based on light water reactors. SCWRs are designed to remove heat from the core using the natural heat-circulation system, usually done by active pumps. This makes the reactors safer. The computational model starts by determining the survival equations (mass, energy and momentum) considered for the nodes. In the stability analysis model and drawing the stability map, these equations are first made linear and then are made dimensionless for better examination. Stability is solved by examining the system response to the created disruption. Stability maps are obtained for an operational period to provide a deeper look towards the inconsistencies in the system. A parametric study was conducted to examine the effect of different design parameters. The rising length is considered an important design parameter, as the increase in length makes the system unstable. In other words, it increases the mass flux rate. One has to consider the interaction between a stable system and a mass flux rate. We found that stability is reduced by increasing the wall cross-section.
