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Vol.5 No.1 previous AA SP9 (59-60-61-62-63-64-65-66)-67-NT 56 -57

Academic Articles
Regular Paper Vol.5No.2 (2013) p.146 - p.154
 

Basic Study on the Phased Array UT Technique for Crack Depth Sizing in Ni-Based Alloy Weld

 
Taiji HIRASAWA1*, Hiroyuki FUKUTOMI1and Akira ISHII2
 
1 Central Research Institute of Electric Power Industry, 2-6-1, Nagasaka, Yokosuka, 240-0196, Japan
2 Kagawa University, 2217-20, Hayashi-cho, Takamatsu, 761-0396, Japan
 
Abstract
In recent years, it has been reported that primary water stress corrosion cracking (PWSCC) has occurred in Ni-based alloy weld components such as steam generator safe end welds, reactor vessel safe end welds, and so on, in PWR. Defect detection and depth sizing are important in order to ensure the reliable operation and life extension of nuclear power plants. In the reactor vessel safe end welds, it was impossible to measure the crack depth of PWSCC. The cracks have occurred in the axial direction of the safe end welds. Furthermore, the cracks had some features such as deep, large aspect ratio (ratio of crack depth and length), sharp geometry of crack tip, and so on. Therefore, development and improvement of crack detection and sizing capabilities for ultrasonic inspection technique have been required. Phased array UT technique for defect depth sizing was applied to the Ni-based alloy weld specimens with EDM notches. From the experimental results, superior performance of phased array UT at the inside inspection of Ni-based alloy weld was shown.
 
Keywords
Ni-Based Alloy Weld, Phased Array UT, Crack Depth Sizing, Primary Stress Corrosion Cracking
 
Full Paper: PDF EJAM Vol.5No.2 pp.146-154 "Basic Study on the Phased Array UT Technique for Crack Depth Sizing in Ni-Based Alloy Weld"

















Article Information
Article history:
Received 4 Apr 2013
Accepted 19 Aug 2013