Modeling and Simulation of Secondary Loop Systems of a Pressurized Water Reactor Based on the 3KEYMASTER Platform

The modeling of the secondary-loop system is important to investigate its behavior. Accurate modeling and simulation under transient conditions are also necessary to verify the control system of the secondary-loop and provide basis for operation scheme. Based on the 3KEYMASTER simulation platform, a simulation model of the secondary-loop system of a pressurized water reactor was built. The model includes the main subsystems such as turbine system, reheat heating system, condensate system, feedwater system. The control system with PID controllers is also added to the model. Three steady-state working conditions are obtained at 100%, 70%, and 50% full power. Power transients, such as power step change, are simulated by changing the boundary conditions, and the system responses are recorded and investigated. The trends of key parameters are reasonable and meets the simulation experimental requirements. The secondary-loop system model follows the basic physical laws and can be used for nuclear power plant engineering simulation analysis. With reasonable simplifications and assumptions, it can be used as a control object for nuclear power plant control scheme design and verification studies. Its steady-state accuracy meets the requirements of training operators and also provides a good test environment for the design and operation of new generation nuclear power units.