Containment model library of the Apros process simulation software: an overview of development and validation work

Pressure Transient Analysis on the Condenser of the HPR1000 Nuclear Power Unit

“…(4) After the turbine tripping, the condensate pump is shut down without considering the idleness of the condensate pump, and water flow is instantaneously at 0; (5) After the turbine tripping, the vacuum pump is shut down without considering idle running; (6) The model needs to consider the influence of the steam side volume of the condenser on the vacuum; (7) Without considering the heat dissipation of the condenser shell due to the temperature rise, the metal heat storage inside the condenser should be considered; (8) According to the steam turbine bypass steam system, two sets of valves open at the same time calculation; (9) When the steam turbine bypass valve opens, the bypass steam flow reaches the maximum flow of the valve and maintains this until the end of the simulation; (10) According to the calculation assumptions ( 8) and ( 9), the pressure changes of the two condensers are consistent during the simulation process, and the model is only simulated for one. From the diagram, it can be seen that, under the initial state of the unit back pressure of 11.8 kPa, after experiencing transient sequence 1 (Figure 3a), the turbine generator set and the circulating water pumps, the main feed water pumps, and the pumps tripped, and the condenser pressure increased rapidly.…”

“…Silde et al [10] provided a detailed validation of selected validation cases and demonstrated that Apros can be used for analyses of containment thermal-hydraulic behavior, including related aspects of engineering safety systems in various containment geometries. Xian et al [11] developed the OTSG numerical model of ACP100 (Advance China Plant 100 MW, Modular Small Reactor developped in China) with Apros and gave the key parameters that influenced the OTSG's operation during the whole startup process.…”