Method for monitoring pressure pipeline leakage acoustic emission in nuclear power plant and monitoring system thereof
A technology for pressure pipelines and pipeline leakage, applied in pipeline systems, mechanical equipment, gas/liquid distribution and storage, etc., can solve the problems of lack of effective estimation of leakage rate, identification and location of pressure pipeline leakage, inability to quantitative analysis of leakage, etc. Achieve the effect of improving real-time performance and sensitivity, improving reliability, and improving the ability to resist false alarms
Active Publication Date: 2012-09-19
NUCLEAR POWER INSTITUTE OF CHINA
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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
Method used
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Embodiment
[0106] Using the method and system of the present invention, using the power equipment comprehensive test device as a test platform, respectively connect the processed microporous test piece and the leakage test section of the pressure pipeline through the crack to the test interface of the power equipment comprehensive test device, and the pressure on the nuclear power plant Pipelines are subjected to thermoacoustic effect test of insulation layer, micropore leakage test and acoustic emission test of pipeline through crack leakage:
[0107] Four 0Cr18Ni 10Ti high-pressure pipes with an outer diameter of Φ152mm, a wall thickness of 12mm, and a length of 7700mm (consisting of a 500mm-long crack test piece and a 3600mm-long pipe section welded front and back) were used as test pieces. An axial V-shaped groove is etched on the inner surface of the piece, and the crack opening area calculation model and the crack leakage calculation model of the pressure pipeline are used to calcul...
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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 calibrationtest 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 leakageevent 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 ...
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IPC IPC(8): F17D5/06
Inventor 刘才学何攀宋健王瑶艾琼黄礼渊
Owner NUCLEAR POWER INSTITUTE OF CHINA