異種金属溶接部の溶接線平行欠陥に対する UT 深さ測定法の検討
Investigation of Phased Array UT technique for Circumferential Crack Depth Sizing in Dissimilar Metal Weld
著者:
平澤 泰治 Taiji HIRASAWA 福冨 広幸 Hiroyuki FUKUTOMI 秀 耕一郎 Koichiro HIDE
発刊日:
公開日:
Circumferential DefectDefect Depth SizingDissimilar Metal WeldPerformance DemonstrationPhased Array UT
概要
In recent years, it has been reported that the primary water stress corrosion cracking (PWSCC) has occurred in dissimilar metal weld (DMW) components such as steam generator safe end weld, reactor vessel safe end weld, and so on, in PWR. The depth sizing of such cracks with high accuracy is important in order to ensure the reliable operation and life extension of nuclear power plants. Therefore, construction of the performance demonstration (PD) system for certifying DMW inspection method is being investigated, in Japan. In order to establish the PD system of DMW inspection method, the effective fabrication technology of DMW test specimen with SCC crack and development of phased array UT technique for crack depth sizing are required. In this paper, the results of fabrication procedure of DMW specimen with circumferential SCC crack are described. And then, phased array UT technique for defect depth sizing was applied to the DMW specimen with circumferential defect. From the experimental results, superior performance of phased array UT at the inside inspection of DMW specimen was shown.
