국내원전에 매설된 콜타르 코팅 배관의 음극방식과 FEM법을 이용한 방식성능 시뮬레이션

• Published in: Corrosion science and technology Vol. 16; no. 3; pp. 115 - 127
• Main Authors: 장현영, H. Y. Chang, 김기태, K. T. Kim, 임부택, B. T. Lim, 김경수, K. S. Kim, 김재원, J. W. Kim, 박흥배, H. B. Park, 김영식, Y. S. Kim
• Format: Journal Article
• Language: Korean
• Published: 한국부식방식학회 30.06.2017
• Subjects: cathodic protection; coal tar-coated buried pipe; FEM; nuclear power plant; 금속공학; nuclear power plant; coal tar-coated buried pipe; cathodic protection; FEM
• ISSN: 1598-6462; 2288-6524
• DOI: 10.14773/cst.2017.16.3.115

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.