A simulation study on the application of a fuzzy algorithm to a feedwater control system in a nuclear power plant

Abstract

Abstract The feedwater control system is reponsible for maintaining the steam drum water level at the set point. The response of the feedwater system is so slow that it is difficult to maintain an optimal water level by using a traditional PI (Proportional-Integral) controller. The objectives of the present study are to apply the fuzzy control method, which can utilize the flexibility and the heuristic control strategy employed by humans, to the feedwater control system in a HWR (Heavy Water Reactor) type nuclear power plant, and to improve the starting performance on a steam drum eater level control. Numerical simulations on the step and ramp response for the water level set point and the reactor power, and on the response after manual closing of the feedwater control valve have been performed. The results of the study show that fuzzy control can reflect successfully the experience gained in skilled manual operation. It is expected that fuzzy control can contribute to the reduction of human errors and to the improvement of the reliability and safety of plant operation.