Short-term and long-term analysis of WWER-1000 containment parameters in a large break LOCA

Nuclear safety has been one of the major issues to be studied since the inception of the nuclear industry. Establishing and maintaining core cooling and ensuring containment integrity are the two main goals that nuclear safety must guarantee. The specific type of large LOCA is DECL (Double Ended Cold Leg) break which means a total guillotine type of break in cold leg pipe and is one of the most dangerous accidents in the reactor containment. In this paper, thermal-hydraulic parameters (Temperature and Pressure) of WWER-1000 (Bushehr Nuclear Power Plant) containment in a DECL accident have been simulated by CONTAIN2.0 code and a single cell model. The Containment has been divided to 23 cells in CONTAIN code but for simplicity only one cell has been considered in modeling. The model has been programmed by MATLAB. The accident has been simulated for Short-term (0 < time<200 s) and long-term (200 < time<100,000 s) and all of the results have been compared with Bushehr's Nuclear Power Plant FSAR.