Maes, Guy; Zetec Inc; Canada
Berlanger, J.; Zetec; Canada
Boudreault-Leclerc, F.; Nucleom; Canada
Maes, G.; Zetec; Canada
Session: PAUT-Nuclear Industry
Time: 10:00 - 10:20
The ultrasonic examination of cast austenitic stainless steel (CASS) components and welds has been a challenging issue for the nuclear NDE industry for more than three decades.
Considerations about life-time extension of ageing plants have renewed the interest for this topic. Over the last 10 years, the introduction of low-frequency phased array probes and high-performance data acquisition systems have led to considerable improvements of the UT inspection capability for CASS components. In parallel, critical flaw sizes have been established and documented in ASME Code Case N-838, providing valuable input for realistic flaw acceptance criteria.
This paper will give a summary of the results of research programs in the USA and the on-going regulatory efforts. In addition, results will be presented from blind inspection trials on realistic mock-ups, in the framework of a recent technique validation program (round-robin trial) conducted by EPRI.