Research On The Dynamic Simulation Of The Chemical And Volume Control System In The Nuclear Power Units

Chemical and volume control system (RCV) is a main auxiliary system of the nuclear island. RCV is a typical fluid networks with pipeline, pump, valve, heat exchanger and so on. Its main function is chemical control and volume control to ensure the safety of the reactor. So it is necessary to establish an accurate simulation mode to analyze the dynamic characteristics of the RCV system on the steady and transient conditions. In this paper, aiming at the RCV system of the nuclear plant, the simulation mode of RCV was established, and the dynamic real-time simulation program was developed. The simulation results were compared with the existing date to validate its accuracy. Eventually the simulation program was integrated into real-time simulation system of a nuclear power plant as a complete module. A real-time simulation of the dynamic characteristics of RCV and real-time interaction with other program modules were achieved.In order to achieve real-time simulation of RCV, The structure and operation characteristics of the RCV system were analyzed. The physical model of complex fluid network of RCV was given. Fluid network nodes conservation equation, momentum equation and energy conservation equation were established. The detailed mathematical model of the key equipment in the RCV system was created. Then the momentum equation will be linearized. The three equations were combined, the node pressure, temperature and flowrate would be solved.In this paper, based on the fluid network theory, the real-time simulation program of RCV was developed. The fluid network core computer program was developed on the MATLAB platform. The user interface and data exchange module were written with VB core. Based on the technology of the VB application integrating with MATLAB, the visual interface of VB and the ability of computer of MATLAB were integrated.Independent test and integrated test was carried to analyze the steady state and transient state characteristics of RCV, and test the stability and reliability of the program. First, on steady operating conditions, the simulation results were compared with actual operating data and Flowmaster simulation results. The deviation of nodes pressure, temperature and flow rate was less than 5%, to verify the accuracy of the contents of the fluid network algorithms and mathematical models of RCV equipment. Secondly, A variety of transient and fault conditions were dynamic simulated. The dynamic response curves of node pressure, flow rate and the temperature had reasonable trend at these different transient conditions, and met the real-time requirements. Finally, the simulation program of RCV was integrated into a real-time simulation system of the nuclear power plan for joint debugging as a module. The results showed the program is stable, and data exchange met the needs of real-time simulation. In this paper, a complete real-time simulation program module of RCV in nuclear power plant was developed to implement the dynamic simulation and data exchange capabilities. While it provided a reference for the same real-time simulation of fluid systems...