SIMULATION OF INADVERTENT ROD CLUSTER CONTROL ASSEMBLY BANK WITHDRAWAL AT POWER FOR ANGRA I NPP USING AN LQR DIGITAL CONTROLLER

摘要

This paper simulates a rod cluster control assembly bank withdrawal at full power for a PWR incorporating a linear quadratic regulator (LQR) for evaluating the plant stability behavior before actuation of the reactor protection system. The results obtained are quantitatively compared with those presented in the final safety analysis report (FSAR) of Angra Ⅰ nuclear power plant, a Westinghouse-designed 640 MWe reactor. The results obtained by our simulation model show that power response, pressure, and average coolant temperature to a rod cluster control assembly withdrawal incident starting from full power are in accordance with those presented in FSAR. Higher control flexibility has been observed and also all local controllers were integrated into a unique LQR global controller, which in turn allows easier insertion of restrictions to state variables. All calculations and plots were generated by MATLAB™.