Izvestia Vysshikh Uchebnykh Zawedeniy. Yadernaya Energetika

The peer-reviewed scientific and technology journal. ISSN: 0204-3327

Analysis of acoustic signals of leak for increases in sensitivity of control due to creation of effective diagnostic features

3/23/2018 2018 - #01 Global safety, reliability and diagnostics of nuclear power installations

Shvetsov D.M. Trykov E.L. Leskin S.T. Puzakov A.Yu.

DOI: https://doi.org/10.26583/npe.2018.1.11

UDC: 621.039.58

Currently, to monitor the integrity of equipment and pipelines, and timely detection of leaks from the primary coolant of the reactor facility during operation of the unit at different power levels in normal operation and a disruption of the normal operation systems are used for acoustic control leak (SACL). As the main diagnostic features of leak detection systems used, the dispersion of acoustic signal and its average frequency. The sensitivity of these features is determined by the signal exceeding a predetermined threshold value, wherein the threshold value is determined by the background. Background values of the acoustic signal depend on the mode of operation of the equipment and often do not allow to determine the flow of the coolant at an early stage of its development.

The paper presents a new approach to the formation of diagnostic features detection of leaks in the circuit at an early stage of development of leaks of the coolant. The method of obtaining diagnostic features based on processing the acoustic signal accompanying the expiration of the coolant from the tubing, in different frequency ranges using the method of principal components.

The efficiency of the developed technique to detect leaks of the coolant is demonstrated on the processing of acoustic signals of the experimental device and simulation flow of coolant during depressurization of the circuit.

The sensitivity of the method even in the presence of significant acoustic background allows to detect leaks much lower consumption (up to five times) than the traditional processing of the acoustic signal.

Implementation of the developed technique does not require significant expenses on modernization of existing control systems, leaks, currently working on various nuclear power plants.

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leakage test equipment dispersion of the acoustic signal modeling of leaks of the coolant the method of main components additional diagnostic signs pattern recognition