원전 배관의 두께 측정 데이터에 대한 신뢰도 분석 방법 및 적용
Method and Application for Reliability Analysis of Measurement Data in Nuclear Power Plant
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초록
Pipe wall-thinning by flow-accelerated corrosion and various types of erosion is significant damage in secondarysystem piping of nuclear power plants(NPPs). All NPPs in Korea have management programs to ensurepipe integrity from degradation mechanisms. Ultrasonic test(UT) is widely used for pipe wall thicknessmeasurement. Numerous UT measurements have been performed during scheduled outages. Wall-thinningrates are determined conservatively according to several evaluation methods developed by Electric PowerResearch Institute(EPRI). The issue of reliability caused by measurement error should be considered inthe process of evaluation. The reliability analysis method was developed for single and multiple measurementdata in the previous researches. This paper describes the application results of reliability analysis methodto real measurement data during scheduled outage and proved its benefits.
Abstract
Pipe wall-thinning by flow-accelerated corrosion and various types of erosion is significant damage in secondarysystem piping of nuclear power plants(NPPs). All NPPs in Korea have management programs to ensurepipe integrity from degradation mechanisms. Ultrasonic test(UT) is widely used for pipe wall thicknessmeasurement. Numerous UT measurements have been performed during scheduled outages. Wall-thinningrates are determined conservatively according to several evaluation methods developed by Electric PowerResearch Institute(EPRI). The issue of reliability caused by measurement error should be considered inthe process of evaluation. The reliability analysis method was developed for single and multiple measurementdata in the previous researches. This paper describes the application results of reliability analysis methodto real measurement data during scheduled outage and proved its benefits.
참고문헌 (9)
- Recommendations for an Effective Flow-Accelerated Corrosion Program (NSAC-202L-R4), "EPRI", ~, pp.Technical Report 2001000563 (2013)
- Mentoring Guide for Flow-Accelerated Corrosion Engineers, "EPRI", ~, pp.022295 (2010)
- Recommendations for Controlling Cavitation, Flashing, Liquid Droplet Impingement, and Solid Particle Erosion in Nuclear Power Plant Piping Systems, "EPRI", ~, pp.Final Report, 1011231 (2004)
- Guidelines for Plant Modeling and Evaluation of Component Inspection Data, "EPRI", ~, pp.1009599 (2004)
- Least Square Methods for Evaluating Inspection Data, "EPRI", ~, pp.Technical Report, 1018456 (2008)
- Development of an Averaged Point-to-Point Method for Inspection Data, "EPRI", ~, pp.Technical Report 1020528 (2010)
- Statistical Methods for the Analysis of Multiple- Inspection Flow-Accelerated Corrosion Data, "EPRI", ~, pp.1019175 Final Report (2009)
- 윤훈, "배관감육 평가를 위한 UT 측정 신뢰도 분석", CORROSION SCIENCE AND TECHNOLOGY, 11(4), pp.129~134 (2012), 한국부식방식학회
- H. Yun, "Reliability Analysis Method for Repeated UT Measurement Data in Nuclear Power Plants", Procedings of the CSSK sping meeting, pp.12~ (2013), CSSK, CHONNAM National Univ