3D 유한요소법을 이용한 원전 매설배관 부식결함 탐상기술 개발
Technology for the Detection of Corrosion Defects in Buried Pipes of Nuclear Power Plants with 3D FEM
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초록
The modeling of 3D finite elements based on CAD data has been used to detect sites of corrosiondefects in buried pipes. The results generated sophisticated profiles of electrolytic potential and vectorsof current distributions on the earth surface. To identify the location of defects in buried pipes, thecurrent distribution on the earth surface was projected to a plane of incidence that was identical tothe pipe locations. The locations of minimum electrolytic potential value were found. The results showadequate match between the locations of real and expected defects based on modeling. In addition,the defect size can be calculated by integrating the current density curve. The results show that thedefect sizes were 0.74 m2 and 0.69 m2, respectively. This technology may represent a breakthroughin the detection of indirect damage in various cases involving multiple defects in size and shape,complex/cross pipe systems, multiple anodes and stray current.
Abstract
The modeling of 3D finite elements based on CAD data has been used to detect sites of corrosiondefects in buried pipes. The results generated sophisticated profiles of electrolytic potential and vectorsof current distributions on the earth surface. To identify the location of defects in buried pipes, thecurrent distribution on the earth surface was projected to a plane of incidence that was identical tothe pipe locations. The locations of minimum electrolytic potential value were found. The results showadequate match between the locations of real and expected defects based on modeling. In addition,the defect size can be calculated by integrating the current density curve. The results show that thedefect sizes were 0.74 m2 and 0.69 m2, respectively. This technology may represent a breakthroughin the detection of indirect damage in various cases involving multiple defects in size and shape,complex/cross pipe systems, multiple anodes and stray current.
참고문헌 (8)
- EPRI, "EPRI 1016456, Recommendations for an Program to Control the Degradation of Buried and Underground Piping and Tanks, Revision 1", ~ (2010)
- Development of corrosion environment survey and analysis method for buried pipe II, "KISTEK", ~ (1999)
- KOGAS, "Protection technique handbook", 18~ (2003)
- Plant Engineering: Evaluation of Indirect Assessment Techniques for Coating Flaw Detection, "EPRI", ~, pp.EPRI 1022962 (2011)
- H. Y. Chang, , KPVP, 11, pp.61~ (2015)
- 장현영, "국내원전에 매설된 콜타르 코팅 배관의 음극방식과 FEM법을 이용한 방식성능 시뮬레이션", CORROSION SCIENCE AND TECHNOLOGY, 16(3), pp.115~127 (2017), 한국부식방식학회[DOI]
- "Coatings and Cathodic Protection" (2012)[URL]
- COMSOLTM, "Guidebook of COMSOLTM Multiphysics (Chemistry-Electrochemistry)", pp.174~ (2014), ALTSOFT