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An approach for stringent quality assurance of steam generator tubes

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For detection of localised defects in ultrasonically acceptable wall thickness variation regions in 2.3 mm-thick ferromagnetic steam generator tubes, a two-frequency eddy current approach is proposed. The ultrasonic thickness data of a few defect-free tubes is utilised for optimisation of the two-frequency mixing parameters. The approach is validated by detecting a reference standard hole of 1.2 mm diameter in wall thickness variation regions. With suitable thresholds, this approach has been successfully implemented in production-line for meeting the stringent quality assurance needs of steam generator tubes during manufacturing stages.
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Keywords: Steam generator; eddy current; multi-frequency; quality assurance; ultrasonic

Document Type: Research Article

Affiliations: 1 Head, Electromagnetic, Sensors, Modelling and Imaging Section, NDE Division, Indira Gandhi Center for Atomic Research (IGCAR), Kalpakkam, India.

Publication date: December 1, 2007

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