Corrosion Science and Technology

  • 제14권1호
  • /
  • Pages.33-39
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  • 2015
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  • 1598-6462(pISSN)
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  • 2288-6524(eISSN)
한국부식방식학회 (The Corrosion Science Society of Korea)
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원전 배관의 두께 측정 데이터에 대한 신뢰도 분석 방법 및 적용

Method and Application for Reliability Analysis of Measurement Data in Nuclear Power Plant

  • 투고 : 2014.11.11
  • 심사 : 2015.02.23
  • 발행 : 2015.02.28
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초록

Pipe wall-thinning by flow-accelerated corrosion and various types of erosion is significant damage in secondary system piping of nuclear power plants(NPPs). All NPPs in Korea have management programs to ensure pipe integrity from degradation mechanisms. Ultrasonic test(UT) is widely used for pipe wall thickness measurement. Numerous UT measurements have been performed during scheduled outages. Wall-thinning rates are determined conservatively according to several evaluation methods developed by Electric Power Research Institute(EPRI). The issue of reliability caused by measurement error should be considered in the process of evaluation. The reliability analysis method was developed for single and multiple measurement data in the previous researches. This paper describes the application results of reliability analysis method to real measurement data during scheduled outage and proved its benefits.

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참고문헌

  1. EPRI, Recommendations for an Effective Flow-Accelerated Corrosion Program (NSAC-202L-R4), Technical Report 2001000563, Palo Alto, CA, USA (2013).
  2. EPRI, Mentoring Guide for Flow-Accelerated Corrosion Engineers, 1022295, Palo Alto, CA, USA (2010).
  3. EPRI, Recommendations for Controlling Cavitation, Flashing, Liquid Droplet Impingement, and Solid Particle Erosion in Nuclear Power Plant Piping Systems, Final Report, 1011231, Palo Alto, CA, USA (2004).
  4. EPRI, Guidelines for Plant Modeling and Evaluation of Component Inspection Data, 1009599, Palo Alto, CA, USA (2004).
  5. EPRI, Least Square Methods for Evaluating Inspection Data, Technical Report, 1018456, Palo Alto, CA, USA (2008).
  6. EPRI, Development of an Averaged Point-to-Point Method for Inspection Data, Technical Report 1020528, Palo Alto, CA, USA (2010).
  7. EPRI, Statistical Methods for the Analysis of Multiple- Inspection Flow-Accelerated Corrosion Data, 1019175 Final Report, Palo Alto, CA, USA (2009).
  8. H. Yun and K. M. Hwang, Corros. Sci. Tech., 11, 129 (2012). https://doi.org/10.14773/cst.2012.11.4.129
  9. H. Yun and K. M. Hwang, Reliability Analysis Method for Repeated UT Measurement Data in Nuclear Power Plants, Procedings of the CSSK sping meeting p. 12, CSSK, CHONNAM National Univ., Gwangju, Korea (2013).