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Title: Acoustic emission and guided ultrasonic waves for detection and continuous monitoring of cracks in light water reactor components

Abstract

Acoustic emission (AE) and guided ultrasonic waves (GUW) are considered for continuous monitoring and detection of cracks in Light Water Reactor (LWR) components. In this effort, both techniques are applied to the detection and monitoring of fatigue crack growth in a full scale pipe component. AE results indicated crack initiation and rapid growth in the pipe, and significant GUW responses were observed in response to the growth of the fatigue crack. After initiation, the crack growth was detectable with AE for approximately 20,000 cycles. Signals associated with initiation and rapid growth were distinguished based on total rate of activity and differences observed in the centroid frequency of hits. An intermediate stage between initiation and rapid growth was associated with significant energy emissions, though few hits. GUW exhibit a nearly monotonic trend with crack length with an exception of measurements obtained at crack lengths of 41 mm and 46 mm. Coupling variability and shadowing by the electro-discharge machining (EDM) starter notch set the lower limit of detectability. (authors)

Authors:
; ; ;  [1];  [2]; ;  [1]
  1. Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA 99352 (United States)
  2. Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, Washington, DC (United States)
Publication Date:
Research Org.:
American Nuclear Society, 555 North Kensington Avenue, La Grange Park, IL 60526 (United States)
OSTI Identifier:
22106042
Resource Type:
Conference
Resource Relation:
Conference: ICAPP '12: 2012 International Congress on Advances in Nuclear Power Plants, Chicago, IL (United States), 24-28 Jun 2012; Other Information: Country of input: France; 36 refs.; Related Information: In: Proceedings of the 2012 International Congress on Advances in Nuclear Power Plants - ICAPP '12| 2799 p.
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; CRACK PROPAGATION; CRACKS; FATIGUE; MACHINING; REACTOR COMPONENTS; ULTRASONIC TESTING; ULTRASONIC WAVES; WATER MODERATED REACTORS

Citation Formats

Meyer, R. M., Coble, J., Ramuhalli, P., Watson, B., Cumblidge, S. E., Doctor, S. R., and Bond, L. J. Acoustic emission and guided ultrasonic waves for detection and continuous monitoring of cracks in light water reactor components. United States: N. p., 2012. Web.
Meyer, R. M., Coble, J., Ramuhalli, P., Watson, B., Cumblidge, S. E., Doctor, S. R., & Bond, L. J. Acoustic emission and guided ultrasonic waves for detection and continuous monitoring of cracks in light water reactor components. United States.
Meyer, R. M., Coble, J., Ramuhalli, P., Watson, B., Cumblidge, S. E., Doctor, S. R., and Bond, L. J. Sun . "Acoustic emission and guided ultrasonic waves for detection and continuous monitoring of cracks in light water reactor components". United States.
@article{osti_22106042,
title = {Acoustic emission and guided ultrasonic waves for detection and continuous monitoring of cracks in light water reactor components},
author = {Meyer, R. M. and Coble, J. and Ramuhalli, P. and Watson, B. and Cumblidge, S. E. and Doctor, S. R. and Bond, L. J.},
abstractNote = {Acoustic emission (AE) and guided ultrasonic waves (GUW) are considered for continuous monitoring and detection of cracks in Light Water Reactor (LWR) components. In this effort, both techniques are applied to the detection and monitoring of fatigue crack growth in a full scale pipe component. AE results indicated crack initiation and rapid growth in the pipe, and significant GUW responses were observed in response to the growth of the fatigue crack. After initiation, the crack growth was detectable with AE for approximately 20,000 cycles. Signals associated with initiation and rapid growth were distinguished based on total rate of activity and differences observed in the centroid frequency of hits. An intermediate stage between initiation and rapid growth was associated with significant energy emissions, though few hits. GUW exhibit a nearly monotonic trend with crack length with an exception of measurements obtained at crack lengths of 41 mm and 46 mm. Coupling variability and shadowing by the electro-discharge machining (EDM) starter notch set the lower limit of detectability. (authors)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {7}
}

Conference:
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