1992•Transactions of the American Nuclear SocietyRequires access
New fluorescent penetrant system for remote testing inside tubes
Brent M. Wilson, Valdimar K. Jónsson
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Abstract
It is a well-known fact that existing nondestructive testing methods, such as eddy current and ultrasonic techniques, are limited in the discrimination of complex crack patterns such as closely spaced cracks or axial cracks crossed by circumferential cracks. To resolve this problem, engineers at Vattenfall AB, Ringhals, have developed a fluorescent penetrant method that allows remote in-service inspection of tubes. The method has been used in Ringhals 2, 3, and 4, and the results have been verified on real cracks in pulled steam generator tubes. Cracks < 2 mm long have been identified. The method, which is being patented, is applicable to all sizes of tubing, as well as for other flat or curved surfaces.