배관감육 평가를 위한 UT 측정 신뢰도 분석
Reliability Analysis of UT Measurement for Evaluating Pipe Wall Thinning in Nuclear Power Plants
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조회
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다운로드
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인용
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참고문헌
키워드
초록
UT(Ultrasonic Test), one of the non-destructive tests, is the most common thickness measurement method for evaluating the wear rate in NPPs(Nuclear Power Plants). UT is used widely because it is easy and safe for use. However some amount of error inevitably occurs in attempting to measure the thickness. The error, that could make the thickness data thicker or thinner, may affect estimation of wear rate in pipes. NPPs are composed of a lot of pipes and components. Some of them are tested to check the current status during RFO(Re-Fueling Outage). Reliability analysis of UT is essential for evaluating pipe wear rate and establishing the long-term management plan in NPPs. This paper reviewed the cause of error occurrence and presented the UT data reliability analysis method. Also, this paper shows the application result of reliability analysis to the UT data acquired in NPPs.
Abstract
UT(Ultrasonic Test), one of the non-destructive tests, is the most common thickness measurement method for evaluating the wear rate in NPPs(Nuclear Power Plants). UT is used widely because it is easy and safe for use. However some amount of error inevitably occurs in attempting to measure the thickness. The error, that could make the thickness data thicker or thinner, may affect estimation of wear rate in pipes. NPPs are composed of a lot of pipes and components. Some of them are tested to check the current status during RFO(Re-Fueling Outage). Reliability analysis of UT is essential for evaluating pipe wear rate and establishing the long-term management plan in NPPs. This paper reviewed the cause of error occurrence and presented the UT data reliability analysis method. Also, this paper shows the application result of reliability analysis to the UT data acquired in NPPs.
참고문헌 (4)
- K. M. Hwang, "Disclosing the Root Cause of Local Wall Thinning Observed in the Deflected Turbulent Flow inside Carbon Steel Piping", Proceedings of the Korean Society of Mechanical Engineers, pp.1~ (2007)
- K. M. Hwang, "Wall Thinning Analysis for Secondary Side Piping of Domestic NPPs using CHECWORKS Code", Proceedings of the Korean Society of Mechanical Engineers, 1, pp.807~ (2001)
- Guidelines for Plant Modeling and Evaluation of Component Inspection Data, "Jeffrey Horowitz", 4-1~, pp.EPRI 1009599 (2004)
- Statistical Methods for Analysis of Multiple-Inspection Flow-Accelerated Corrosion Data, "Jeffrey Horowitz", 3.3~, pp.EPRI 1019175 (2011)