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Failure Analysis of Nuclear Generating Station Tube Leaks

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Failure Analysis of Nuclear Generating Station Tube Leaks

Published By Kinectrics

Published September 2006
3 Page(s)

One of the 17 tubes (stainless steel 304L) from a feeder cabinet instrument line in a unit of a large Nuclear Generating Station (NGS) was found leaking at a location below a carbon steel support clamp. Failure analysis of this tube indicated that the leak was attributed to circumferential transgranular stress corrosion cracking (TGSCC). The cracks appeared to be OD initiated and located at the tension side of the tube (from bending) and chloride was detected in the deposits on the tube and fracture surfaces. It was suspected that chlorides originated from the heat-resistant paint that was applied to the tube.