DEVELOPMENT OF AN ENGINEERING SIMULATOR WITH REALISTIC TURBINE ISLAND SYSTEMS FOR NPP DCS CLOSED-LOOP TEST

摘要

In the construction of a NPP, the configuration and function of I&C system need to be verified before connected to the real process systems. An engineering simulator with a virtual reactor model, which can provide plant thermal-hydraulic (T-H) parameters and feedbacks for I&C systems, is an effective tool for the closed-loop test of DCS. However, insufficient of the simulator was also exposed in the application of DCS testing for lack of realistic secondary loop models. To improve the credibility of the simulator, turbine island systems are modeled in detail and verified in this paper. Three fine T-H models of turbine island are coupled together to meet the real-time simulation. For further application, the models are coupled with nuclear steam supply system (NSSS) models, control system models and graphical user interface (GUI) in the simulator. The turbine models are validated based on comparison with design data. The engineering simulator with realistic turbine island model was used for the closed-loop DCS test of NPP. The application showed that characteristic of bypass feedwater valve has a significant influence on the performance of NPP, even leading to reactor trip. It is indicated that authentic secondary side models are important for DCS closed-loop test.