Abstract
A comprehensive programme has been carried out to assess quantitatively the capability of manual ultrasonic examination techniques used during in-service inspection of nuclear power plants, on joints made from austenitic stainless steel, subject to the occurrence of the IGSCC cracking phenomenon. A set of samples with different types of planar flaws simulating IGSCC, fully characterized, to be used as a reference for the reliability study, was first prepared. Then an exercise for data acquisition and processing was conducted to assess flaw detection and correct interpretation capability, the flaw length and depth sizing capability. The subsequent evaluation of the data gave quantitative results in terms of such statistical parameters as probability of detection and correct interpretation, false call probability, probability of correct sizing, measurement accuracy (both in length and depth), and critical miscall rate. Different analyses were made for achieving distinct pieces of information for various examination methods and technical features.
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