PD 資格試験開始から 10 年の実施状況
The PD Center of Central Research Institute of Electric Power Industry (CRIEPI) commenced performance demonstration examinations (PD examination) for flaw depth sizing of austenitic stainless steel pipes in March 2006. At the end of FY 2015, 44 examination sessions have been completed and 58 candidates have passed the examination. The total number of PD examinee including re-tests and re-certification was 104. Passed candidates can perform depth sizing of SCC flaws with a high level of accuracy during the past decade. RMSE and the standard deviation for the unsuccessful candidate of PD examination tend to increase with increasing wall thickness of the PD specimen. The pass rate of the PD examinations is approximately constant regardless of age of the PD examinee.