Although control performance of some fuzzy logic control systems in a nuclear power plant are analytically evaluated, there is no examples of the application to the actual plant. This is mainly because that it requires long time for careful tuning of parameters (membership functions) as compared with the case in conventional control system.We have studied the application of fuzzy logic controller to the feedwater control system in the FUGEN advanced thermal reactor. In order to reduce the controller tuning time in the actual plant, we limited the operational region for fuzzy logic control and used a weight instead of membership functions as the tuning parameters.A schematic model of the feedwater system in the FUGEN is used for the study of the tuning method. Efficiency of the developed method was demonstrated by numerical simulation as well as by the application to FUGEN.From the operational data of the actual plant, we confirmed the improvement of controllability by the fuzzy logic control system. KEYWARDS: fuzzy logic control, nuclear power plants, limited fuzzy control region, weight, feedwater controller, feedwater control system, parametric analysis, operating parameters (Fugen Nucl. Power Station, Power Reactor and Nucl. Fuel Dev. Corp.)
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