Abstract
This paper proposes a fuzzy fault accommodation (FFA) method for nuclear power plants under actuator stuck faults. It can adjust the plant target load dynamically to match the reactor power during transients in which a few of the actuators lose their regulating capacity completely. The method was applied to a small pressurized water reactor (SPWR) under control rod driven mechanism and steam generator feedwater valve stuck faults. The obtained results demonstrate that the method can maintain balance well between the plant load and the reactor power under actuator stuck faults. Accordingly, the coolant average temperature and steam pressure of the SPWR can be restored to their constant setpoints without regulating the corresponding actuators, i.e., the control rods and the feedwater valves, demonstrating the effectiveness of the method. The research is expected to provide possible solutions for the reasonable and satisfactory control of NPPs under the dangerous actuator stuck faults.
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