Abstract: In the diploma thesis the flow pattern and conditions in the downcomer of a pressurized water nuclear reactor were simulated, to study coolant mixing inside the primary circuit. This was done using computational dynamics software Ansys CFX. The nuclear reactor in Krško (Slovenia) was used as a basis for the model. The downcomer geometry was simplied for a more feasible study. Three separate simulations were done: one with normal conditions, one with loss of coolant accident conditions and one with a modified geometry. The flow was then studied at different condition at the same levels using velocity contours. The results showed that the axial velocity profiles at the downcomer outlet are not completely uniform.Keywords: Nuclear Power Plant, Pressurized Water Reactor, Downcomer, Flow simulation, Ansys CFXPublished in DKUM: 13.10.2021; Views: 508; Downloads: 47 Full text (2,49 MB)
