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Ultrasonic Transducer Design for the Axial Flaw Detection of Dissimilar Metal Weld  

Yoon, Byung-Sik (KHNP Central Research Institute)
Kim, Yong-Sik (KHNP Central Research Institute)
Yang, Seung-Han (KHNP Central Research Institute)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.31, no.5, 2011 , pp. 536-542 More about this Journal
Abstract
Dissimilar metal welds in nuclear power plant are known as very susceptible to PWSCC flaws, and periodically inspected by the qualified inspector and qualified procedure during in-service inspection period. According to field survey data, the majority of their DMWs are located on tapered nozzle or adjacent to a tapered component. These types of configurations restrict examination access and also limit examination volume coverage. Additionally, circumferential scan for axially oriented flaw is very difficult to detect located on tapered surface because the transducer can't receive flaw response from reflector for miss-orientation. To overcome this miss-orientation, it is necessary adapt skewed ultrasonic transducer accomodate tapered surface. The skewed refracted longitudinal ultrasonic transducer designed by modeling and manufactured from the modelling result for axial flaw detection. Experimental results showed that the skewed refracted longitudinal ultrasonic transducer get higher flaw response than non-skewed refracted longitudinal ultrasonic transducer.
Keywords
Performance Demonstration; Dissimilar Metal Weld; Ultrasonic Transducer; PWSCC;
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  • Reference
1 ASME Boiler and Pressure Vessel Code, Section XI, Division 1, Appendix VIII, "Performance Demonstration for Ultrasonic Examination Systems," American Society of Mechanical Engineers, New York, pp. 333-342 (1995)
2 김용식, 윤병식, 양승한, "원전 이종금속 요접부 초음파탐상검사 기량검증 기술개발", 2010 Spring Conference of KSNT, pp. 29-340 (2010)
3 양승한, 김용식, 윤병식, 권기일, "원전 이종 금속 용접부 초음파검사 일반 절차서 개발", Transactions of KPVP, 제6권, 제01호, pp. 23-28 (2010)
4 D. E. MacDonald and M. A. Dennis, "3D computer model for tapered dissimilar metal wled examination," Proceedings of the Sixth International Conference on NDE in Relation to Structural Integrity for Nuclear and Pressure Components, pp. 267-277 (2007)
5 EPRI, "Ultrasonic Examination of Nozzle Inner Radius Regions" TR-107493, Palo Alto, (1997)
6 김경조, 강성식, 송명호, 정구갑, 정해동, "국제공동연구 PINC(Program for the Inspection of Nickel Alloy Components) 현황 및 고찰", 제29권 제2호, pp. 153-161 (2009)
7 CIVA: Simulation Software for Non Destructive Testing, www-civa.cea.fr
8 T. Sasahara and H. Inoue, "Application of logarithmic amplifier to ultrasonic imaging," 17th World Conference on Nondestructive Testing, pp. 254-362 (2008)