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RESEARCH PAPERS

Condition Monitoring of a Nuclear Power Plant Check Valve Based on Acoustic Emission and a Neural Network

[+] Author and Article Information
Min-Rae Lee

Department of Mechanical Design Engineering,  Pusan National University, Korealmin97@pusan.ac.kr

Joon-Hyun Lee1

School of Mechanical Engineering, Pusan National University, San 30 Jangjeon-dong, Kumjeong-gu, Pusan, 609-735, Koreajohlee@pusan.ac.kr

Jung-Teak Kim

Man-Machine Interface System Team, Korea Atomic Energy Research Institute Yuseong, Daejeon, 305-600, Koreajtkim@kaeri.re.kr

1

Corresponding author. School of Mechanical Engineering, Pusan National University, Pusan, 609-735, Korea. Telephone: 82-51-510-2430; Fax: 82-51-512-9835.

J. Pressure Vessel Technol 127(3), 230-236 (Apr 11, 2005) (7 pages) doi:10.1115/1.1991880 History: Received March 02, 2005; Revised April 11, 2005

The analysis of acoustic emission (AE) signals produced during object leakage is promising for condition monitoring of the components. In this study, an advanced condition monitoring technique based on acoustic emission detection and artificial neural networks was applied to a check valve, one of the components being used extensively in a safety system of a nuclear power plant. AE testing for a check valve under controlled flow loop conditions was performed to detect and evaluate disk movement for valve degradation such as wear and leakage due to foreign object interference in a check valve. It is clearly demonstrated that the evaluation of different types of failure modes such as disk wear and check valve leakage were successful by systematically analyzing the characteristics of various AE parameters. It is also shown that the leak size can be determined with an artificial neural network.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 3

Diagnosis algorithm using the neural network

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Figure 4

Four different kinds of artificial defects of check valve. (a) Disc wear, (b) hinge pin wear, (c) foreign objective, (d) improper assembly.

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Figure 5

Direct Vessel Injection (DVI) test loop of the check valve test

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Figure 6

Test configuration of the check valve

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Figure 7

Photograph of experimental setup

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Figure 8

AE r.m.s versus pressure obtained from “disc wear” and “foreign object” failure

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Figure 1

Typical swing type check valve (a) configuration of swing type check valve (b) photograph of swing type check valve (4 in.)

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Figure 2

Simplified depiction of the condition monitoring for the check valve

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Figure 9

AE r.m.s value versus leak rate obtained from “disc wear” and “foreign object” failure

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Figure 10

Frequency Spectra of leak signals at the 150 kHz sensor (a) “disc wear” (b)“foreign object” failure modes

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