Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Protection Performance Simulation of Coal Tar-Coated Pipes Buried in a Domestic Nuclear Power Plant Using Cathodic Protection and FEM Method

국내원전에 매설된 콜타르 코팅 배관의 음극방식과 FEM법을 이용한 방식성능 시뮬레이션

  • Chang, H.Y. (Power Engineering Research Institute, KEPCO Engineering & Construction Company) ;
  • Kim, K.T. (Materials Research Centre for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University) ;
  • Lim, B.T. (Power Engineering Research Institute, KEPCO Engineering & Construction Company) ;
  • Kim, K.S. (Power Engineering Research Institute, KEPCO Engineering & Construction Company) ;
  • Kim, J.W. (Power Engineering Research Institute, KEPCO Engineering & Construction Company) ;
  • Park, H.B. (Power Engineering Research Institute, KEPCO Engineering & Construction Company) ;
  • Kim, Y.S. (Materials Research Centre for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University)
  • 장현영 (KEPCO E&C, 미래전력기술연구소) ;
  • 김기태 (안동대학교 신소재공학부, 청정에너지소재기술 연구센터) ;
  • 임부택 (KEPCO E&C, 미래전력기술연구소) ;
  • 김경수 (KEPCO E&C, 미래전력기술연구소) ;
  • 김재원 (KEPCO E&C, 미래전력기술연구소) ;
  • 박흥배 (KEPCO E&C, 미래전력기술연구소) ;
  • 김영식 (안동대학교 신소재공학부, 청정에너지소재기술 연구센터)
  • Received : 2016.12.21
  • Accepted : 2017.06.20
  • Published : 2017.06.30
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Abstract

Coal tar-coated pipes buried in a domestic nuclear power plant have operated under the cathodic protection. This work conducted the simulation of the coating performance of these pipes using a FEM method. The pipes, being ductile cast iron have been suffered under considerably high cathodic protection condition beyond the appropriate condition. However, cathodic potential measured at the site revealed non-protected status. Converting from 3D CAD data of the power plant to appropriate type for a FEM simulation was conducted and cathodic potential under the applied voltage and current was calculated using primary and secondary current distribution and physical conditions. FEM simulation for coal tar-coated pipe without defects revealed over-protection condition if the pipes were well-coated. However, the simulation for coal tar-coated pipes with many defects predict that the coated pipes may be severely degraded. Therefore, for high risk pipes, direct examination and repair or renewal of pipes are strongly recommended.

Keywords

References

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