Vibration monitoring system of reactor and reactor internals

Abstract

The invention provides a vibration monitoring system of a reactor and reactor internals, solving the problems of reliability, compatibility, stability and maintenance convenience and comprising an accelerometer, a charge amplifier, signal conditioning equipment, vibration signal analyzing equipment, a display terminal, vibration monitor software and the like. In the signal conditioning equipment,a signal conditioning module carries out programmable amplification and low-pass filter on vibration signals, and a multi-channel selection module receives control signals of a self-check control module of the vibration signal analyzing equipment so as to realize system programmable self check; the vibration signal analyzing equipment comprises a PXI bus crate; the vibration monitor software calculates vibration characteristic frequency and amplitude of each channel as well as a CPSD value, a coherence value and a phase value of each channel pair and monitors vibration acceleration and amplitude of a pressure vessel of the reactor, a first order modal frequency and amplitude and a second order modal frequency and amplitude of a reactor fuel assembly, frequency and amplitude of a core barrel beam mode and a second order shell mode as well as swinging frequency and amplitude of the pressure vessel, and the like.

Description

technical field [0001] The invention relates to a nuclear power plant reactor monitoring system, in particular to a reactor and reactor internal components vibration monitoring system. Background technique [0002] International standards and national nuclear industry standards (such as IEC 61502-1999 and EJ_T1188-2005) stipulate that the vibration of reactors and reactor internals in nuclear power plants needs to be monitored regularly. [0003] There is no report on the development of nuclear power plant reactors and reactor internal components vibration monitoring systems and related patented technologies by other domestic units. The vibration monitoring systems of active nuclear power plants are all imported from abroad. For example, Qinshan Nuclear Power Phase I has not been installed, Qinshan Nuclear Power Phase II, Australia's nuclear power is France's 01dB-Stell, Tianwan nuclear power is Russia's. [0004] The KIR vibration monitoring system supplied by France 01dB-...

AI Technical Summary

Problems solved by technology

[0006] (1) Vibration and noise analysis requires that the analyzed channels have strict synchronization performance. The KIR vibration monitoring system adopts the combination of traditional multiplexer and dual-channel digital acquisition, and collects and analyzes by selecting two channels each time. After the analysis, switch to the other two channels for acquisition and analysis, which is not only time-consuming (a measurement process takes several hours), but if the reactor operating conditions fluctuate within several hours, it will lead to inconsistency in the vibration measurement results;

[0007] (2) The original signal waveform display function is lacking, and it is impossible to visually judge whether the collected data is correct or not, and whether the system magnification setting is appropriate;

[0008] (3) Lack of auto-spectrum and cross-spectrum manual analysis functions, and new spectral lines appearing in the spectrogram cannot be analyzed;

[0009] (4) The monitoring frequency band is solidified, and the setting function of the monitoring frequency band is lacking. After the characteristic frequency band drifts, the monitoring result will deviate from the actual vibration situation;

[0010] (5) The original data is not saved, and when an abnormal signal is detected or a secondary analysis of the signal is required, additional data acquisition equipment and analysis equipment are required;

[0011] (6) The monitoring results are only printed paper materials, which is not convenient for the management and arrangement of monitoring historical data

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