Method for monitoring pressure pipeline leakage acoustic emission in nuclear power plant and monitoring system thereof

Abstract

The invention relates to a method for monitoring pressure pipe leakage acoustic emission in a nuclear power plant and a monitoring system thereof. The monitoring method adopts the technical scheme that a pressure pipe leakage test piece is prepared; the initiation, crack, expansion and through leakage of the pipeline of the nuclear power plant are imitated, a leakage acoustic emission calibration test is performed, and the through crack leakage of the pipeline under high temperature and high pressure environment in nuclear power plant is imitated. The monitoring system adopts a standardized and modularized design which is based on PXI bus and convenient for system maintenance and part replacement. Through adopting the monitoring method and the monitoring system, the data record of leakage event and the database management of monitoring result can be achieved; moreover, the leak position and the dynamic change of leak rate are completely reflected.

Description

technical field [0001] The invention relates to a monitoring method and a monitoring system for a nuclear power plant pressure pipeline, in particular to a nuclear power plant pressure pipeline leakage acoustic emission monitoring method and a monitoring system. Background technique [0002] There are a large number of welded structures in the pressure vessels and pipelines of nuclear power plants, and there will be welding defects in many welds. Alternating loads, as well as being affected by the environment (such as radiation) and media (such as corrosion), will cause the original defects in pressure vessels and pipelines to crack, expand, and sometimes new defects will be initiated. Defective pressure vessels and pipelines cause crack initiation and expansion during production, and eventually lead to failure of pressure vessels and pipelines. There are two types of failure: leakage and explosion. In order to avoid the occurrence of blasting, the evaluation criterion of ...

AI Technical Summary

Problems solved by technology

However, the current acoustic emission monitoring method for pressure boundary leakage can only realize the identification and location of pressure pipeline leakage, and cannot perform accurate quantitative analysis on leakage, and lacks an effective estimation of leakage rate

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