Monitoring and fault diagnosis method for quality performance of key parts of nuclear power unit

Abstract

The invention discloses a method for determining quality performance problems and faults of key parts of a nuclear power unit by analyzing a structure vibration response signal under determined excitation. The method comprises the following steps: primarily determining positions of excitation and response points according to analysis on common faults or possible potential quality performance problems of the key parts with different types of the nuclear power unit; requiring that a formed running state point-spanning frequency response function can cover possible quality problems and faults; drawing a multi-running-state point-spanning frequency response function curve of the key parts of the nuclear power unit according to real-time acquired excitation signals and vibration response signals of running states of the key part of the nuclear power unit; analyzing a peak value-frequency, a loss factor and a change rule thereof in each running state point-spanning frequency response function of the key parts with the different types; extracting a characteristic parameter of each running state frequency response property curve; quantitatively describing corrosion, crack, abrasion, loosening, leakage and jamming fault properties; testing and determining influences, caused by each fault and a degree thereof, on the characteristic parameter of each stage.

Description

technical field [0001] The invention discloses a monitoring and fault diagnosis method for the quality and performance of critical components of a nuclear power plant, belonging to the technical field of fault diagnosis of nuclear power systems. Background technique [0002] Fault diagnosis technology is one of the important components of nuclear power plant operation support technology. The research on fault diagnosis technology is of great significance to the safety and economy of nuclear power plant. It can enhance the safety performance of nuclear power plant and reduce operator errors. Probability of action. [0003] At present, fault diagnosis methods can be roughly divided into two categories: empirical model method based on data and physical model method based on mathematical equations. These two methods have their own advantages and disadvantages. The former only needs the historical data and online data of the diagnosed object, while the latter can provide more si...

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Problems solved by technology

[0009] (1) From the perspective of the use and operation of the nuclear power plant, since the nuclear power plant is very complex, the components are compact in structure, and some parts are sealed in the safety casing, the fault location is not easy to detect, and the fault result can only be reflected indirectly through the change of the control system detection parameters. It is difficult to accurately determine the location and extent of the fault, and find out the root cause of the fault. Therefore, it is of great practical significance to conduct quality diagnosis through online testing during the operation of nuclear power plants.

[0010] (2) From the point of view of the working principle, operation process and component assembly relationship of the nuclear power plant, the structure of the nuclear power plant is complex and compact, highly integrated, including power drive, medium transmission, and electromechanical system detection and control. Early weak faults are difficult to find , the fault will cause a safety accident soon after the development

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