Tóm tắt

For pressurized water reactors, the pressurizer pressure is expected to be maintained constant to limitrnadverse impacts on the reactor due to pressure variations. To achieve this, a constant pressure setpointrnis usually adopted in the pressurizer pressure control system. But it may not guarantee satisfactory pressurerncontrol performances especially under severe transient conditions. A feasible solution may bernadjusting the pressure setpoint during transient processes and then restoring it to the initial value. Forrnthis purpose, the paper proposes a fuzzy-logic-based pressure setpoint modification (FPSM) methodrnfor pressurizers. A simulation platform was developed in MATLAB/Simulink implementing a nonequilibriumrnthree-region pressurizer model, the pressure and waterlevel control systems and the FPSM system.rnSimulation studies of the AP1000 pressurizer during typical load change transients were performed, andrnresponses of the pressurizer implementing the FPSM system are compared with those employing constantrnpressure setpoint to demonstrate feasibility and effectiveness of the system.