![]() This report discusses the results obtained from the AE monitoring over the period May 1989 to March 1992 (two fuel = , AE instrumentation was installed by PNL and PECO to monitor the flaw indication during two complete fuel cycles. The existence of this flaw indication offered a long sought opportunity to validate AE surveillance to detect and evaluate crack growth during reactor operation. Evaluation of the flaw indication showed that it could remain in place during the subsequent fuel cycle without compromising safety. A flaw indication was identified during normal inservice inspection of piping at Philadelphia Electric Company (PECO) Limerick Unit 1 reactor during the 1989 refueling outage. ![]() The technology was validated off-reactor in several major tests, but it had not been validated by monitoring crack growth on an operating reactor system. Acoustic emission (AE) technology for continuous surveillance of a reactor component(s) to detect crack initiation and/or crack growth has been developed at Pacific Northwest Laboratory (PNL).
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