Method for monitoring nuclear reactor canned motor pump operation fault and monitoring system

Abstract

The invention relates to a method for monitoring nuclear reactor canned motor pump operation fault and a monitoring system. By aiming at a structural characteristic of a canned motor pump, the method for monitoring the nuclear reactor canned motor pump operation fault is established by the processes of signal acquisition, signal analysis, characteristic quantity extraction, abnormity discrimination, alarm, characteristic quantity database establishment and data reanalysis. The invention of the monitoring system adopts a distant controlling technology based on the standardization and modularization of PXI bus and FPGA, the reliability and easy maintenance performance of the system can be enhanced, the monitoring object enables configuration graphical, interface enables visualization, the operation is simple, the data export is convenient. The monitoring method and the monitoring system of the present invention are suitable for monitoring the fault of the nuclear reactor canned motor pump.

Description

technical field [0001] The invention relates to a nuclear reactor equipment operation failure monitoring method and a monitoring system thereof, in particular to a nuclear reactor shielding pump operation failure monitoring method and a monitoring system thereof. Background technique [0002] The main pump of the nuclear reactor is the only power source for the forced circulation of the reactor coolant, and the faulty operation of the main pump will directly endanger the safety of the nuclear reactor. Therefore, all nuclear power plants at home and abroad are equipped with a main pump operation status monitoring system to detect possible faults in the main pump in time, reduce maintenance faults caused by blind disassembly and assembly, reduce the exposure dose of maintenance personnel, shorten the shutdown time, and help prolong The service life of the main pump. The main pump of the nuclear reactor generally uses a shaft-sealed pump, and there are also shielded pumps. Fo...

AI Technical Summary

Problems solved by technology

[0003] (1) In addition to providing bearing vibration values ​​to the main control room, only portable, offline data collectors can be used to periodically collect vibration signals from the buffer output terminals of the cabinet, which lacks real-time and convenience;

[0004] (2) There is only rotor amplitude measurement and no vibration spectrum analysis. It can only monitor whether the rotor vibration is normal, and cannot analyze the rotor vibration trend;

[0005] (3) There is no rotor over-vibration phase detection function. During the maintenance period, a temporary sensor can only be installed on the main pump, and the portable data acquisition device can be used to determine the maintenance or dynamic balance test plan through on-site measurement, analysis and calculation, which is time-consuming and laborious. , personnel are exposed to large doses, and the maintenance time is long;

[0006] (4) Since the shaft seal pump can measure the vibration intensity of the pump body by installing a speed sensor on the pump casing, while the pump casing temperature of the shielded pump is very high, the speed sensor cannot work normally at high temperature;

[0007] (5) Since the rotor of the shaft-sealed pump is exposed, the displacement sensor can be used to conveniently measure the motor speed and rotor displacement, and the measurement results are accurate and reliable; while the rotor of the shielded pump is completely shielded by the pump casing, only an inductive sensor can be used. The AC voltage signal output by the inductive sensor is converted into a rotational speed after calculating the effective value, resulting in a delayed measurement result of the rotational speed and a large measurement error

[0008] Since the rotor of the canned pump is completely shielded by the pump casing, the displacement of the rotor cannot be measured, and it is impossible to directly judge whether the rotor is eccentric or bent or even worn out. It is not until the components are damaged or even unable to operate that the existence of the fault is known

[0009] After retrieval, there is no monitoring technology for nuclear reactor canned pumps at present, and the relevant standards and criteria for monitoring have not yet been established. Therefore, it is necessary to study a nuclear reactor canned pump operation fault monitoring method and its monitoring system.

Images