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Technique improvement for crack depth estimation of steam generator tubes

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Currently, eddy current testing (ECT) is a popular and effective method for steam generator tubing inspection. However, this method, using the ASME standard tube to create calibration curve for crack depth estimation, did not provide sufficiently good accuracy of crack depth. To improve the accuracy, this project has proposed creating new calibration curves using a stress corrosion (SCC) sample produced in the laboratory. First, Inconel-600 tubes with axial and circumferential SCCs were produced. Secondly, the tubes were inspected by ECT and the crack signal angle recorded. Finally, a relationship between crack signal angle and the actual crack depth determined by metallography was used as new calibration curves for depth estimation of SCC. The experimental results show that the accuracy in crack depth estimation is improved by adopting the new curves.
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Document Type: Research Article

Affiliations: 1: Institute of Nuclear Energy Research, 1000 Wenhua Road, Lungtan Township, Taoyuan 325, Taiwan, ROC 2: Atomtech Engineering Co Ltd, Building C, 20F, NO 91, Sec 1, Hsintai 5 Rd, Hsichih, Taipei County 221, Taiwan, R.O.C.

Publication date: May 1, 2005

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