Research on Knowledge Base of Intelligent Diagnosis Expert Based on Tubing Leakage of High-Pressure Heater in Nuclear Power Plants

In order to improve the accuracy and timeliness of the tubing leakage of the high-pressure heater in nuclear power plants, the fault diagnosis is carried out with the terminal difference triggered by the heat economy of the unit. Through the mechanism modeling of the tubing leakage of the high-pressure heater, the set of the symptom parameters related to the fault is obtained. The expert knowledge base of the tubing leakage in the fault diagnosis system of the high-pressure heater is analyzed by using the mathematical statistics and the experience of the on-site experts. Through the insert of man-made fault in the 1000 MW nuclear power model, the intelligent diagnosis expert system of nuclear power plant based on terminal difference is used to fault diagnosis. The results show that the method can accurately diagnose the tubing leakage of the high-pressure heater at the beginning of the fault, which proves the validity and feasibility of the knowledge base.