The dynamic simulation of cold start-up based on two-group point reactor model

Abstract A two-group point reactor model has been used to simulate the cold start-up of a small pressurized-water reactor. When compared with the results of a three-dimensional computation model, the simulation results obtained with this method show that the method is suitable for the prediction of the power variations, variations of coolant average temperature and fuel temperature when a small pressurized-water reactor starts up in a cold state is of interest. It is also shown that the method is conservative for safety analysis of reactor cold start-up, even though it requires a shorter computing time.