Nuclear power station pressure pipeline leakage acoustic emission monitoring method and monitoring system thereof

Abstract

The invention relates to a nuclear power station pressure pipeline leakage acoustic emission monitoring method and a monitoring system thereof. The monitoring method comprises the following steps that: a pressure pipeline leakage test piece is prepared; the defects of initiation, cracks, expansion and even through leakage of a nuclear power station pipeline are simulated; a leakage acoustic emission calibration test is taken; and the pipeline through crack leakage of the high-temperature and high-pressure environment of a nuclear power station is simulated. The monitoring system adopts a standardized and modularized design based on a PCI extensions for instrumentation (PXI) bus, so that the system overhaul and the part replacement are convenient. According to the invention, the data recording of leakage events and the database management of monitoring results can be carried out, and the leakage positions and the dynamic changes of the leakage rate thereof can be comprehensively 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 the influence of 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. [0003] Defective pressure vessels and pipelines cause crack initiation and expansion during production, and eventually lead to failure of pressure vessels and pipelines; the failure forms include leakage and blasting. [0004] In order to avoid the occurrence of blasting, the evaluation crit...

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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