A New Eddy Current 3-D Profilometry for a Quantitative Measurement of Geometric Anomaly in Steam Generator Tubes of Nuclear Power Plants

Abstract:

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Most of the corrosive degradations in steam generator tubes of nuclear power plants are closely related to the residual stress existing in the local region of a geometric change, that is, an expansion transition, u-bend, ding, dent, bulge, etc. Therefore, accurate information on a geometric anomaly in a tube is a prerequisite to the activity of a non destructive inspection for a precise and earlier detection of a defect in order to prevent a failure during an operation, and also for a root cause analysis of a failure. In this paper, a newly developed eddy current technique of a three-dimensional profilometry is introduced and the proof for the applicability of the technique to a plant inspection is provided. The quantitative profile measurement using a new eddy current probe was performed on steam generator expansion mock-up tubes with various geometric anomalies typically observed in the operating power plants, and the accuracy of the measured data was compared with those from the laser profilometry.

Info:

Periodical:

Key Engineering Materials (Volumes 321-323)

Edited by:

Seung-Seok Lee, Joon Hyun Lee, Ik Keun Park, Sung-Jin Song, Man Yong Choi

Pages:

426-429

DOI:

10.4028/www.scientific.net/KEM.321-323.426

Citation:

D. H. Lee et al., "A New Eddy Current 3-D Profilometry for a Quantitative Measurement of Geometric Anomaly in Steam Generator Tubes of Nuclear Power Plants", Key Engineering Materials, Vols. 321-323, pp. 426-429, 2006

Online since:

October 2006

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Price:

$35.00

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[2] H.J. Kim et al, Root Cause Analysis and Measures for the Steam Generator Tube Rupture Incident in Ulchin Unit 4, KINS, (2003).

[3] D.H. Hur et al, Korea Patent Application No. 6391, KAERI, (2004).

[4] J. Kang, X-probe Experience at Diablo Canyon, 22 nd EPRI SG NDE Workshop, Hilton Head, USA, (2003).

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