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概要

The PD Center of Central Research Institute of Electric Power Industry (CRIEPI) commenced Performance Demonstration examinations for flaw depth sizing of austenitic stainless steel pipes in March 2006. As of January 2013, 37 examination sessions have been completed and 44 candidates have passed the examination. The total number of tests administered including re-tests and re-certification was 89. It was noted that depth sizing using a phased array plus the manual UT technique was the procedure most used by successful PD applicants. A major reason for failure is “the overestimation caused by the lack of skill in distinguishing the base metal-to-weld metal interface echo and the SCC tip echo“. Moreover, the possibility of psychological bias is also incontrovertible because candidates are under pressure not to make a -4.4mm critical mistake.

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