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원전 매설 HDPE 배관의 응력에 대한 해석 변수 영향 고찰
김종성(J.S. Kim),김윤재(Y.J. Kim),이승건(S.G. Lee),박흥배(H.B. Park) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Recently, there has been trend to use HDPE material with buried piping in nuclear power plants. ASME B&PV Code, Code Case N-755, which is technical basis including design requirements for the nuclear safety class 3 buried HDPE piping, presents thickness calculation equation based on thin-walled piping equation, and doesnt consider thickness-directional temperature gradient and nonlinearity of Youngs modulus. HDPE piping is made of thick-walled piping because of low mechanical strength relative to steel, can have high temperature gradients along thickness due to low thermal condictivity, and the Youngs modulus of HDPE may have nonlinearity for strain. In this study, effect of analysis variables such as the thick-wall thickness, the thickness directional thermal gradient, and the nonlinearity of elastic modulus on stresses for the buried HDPE piping was investigated via finite element analysis.
기술노문특집 : 원자력 발전설비의 부식현황 및 대처방안 ; 기술논문 : 유도가열 벤딩배관의 원전 안전계통 적용을 위한 설계 적합성 평가
장현영 ( H Y Chang ),오영진 ( Y J Oh ),김경수 ( K S Kim ),박흥배 ( H B Park ),박흥배 ( I G Bae ),성기호 ( G H Sung ),우창수 ( C S Woo ) 한국부식방식학회(구 한국부식학회) 2013 부식과 방식 Vol.12 No.-
Induction heating technique is an alternative method method to have straight pipes bent compared to traditional hot bending techniques. This bending technique uses localized heating from the high frequency induction band resulting in well-formed bend section. In this study, current codes and standards as well as design requirements of the newest NPPs over the world were analyzed to apply this technique to the safety related piping in NPPs in Korea. Designs of safety related systems and piping materials were examined for the compatibility of bending pipes replaced traditional elbows in the newest NPP. The required items of material properties and qualities in bent pipes were drawn reflecting anticipated regulatory requirements in the view of long term aging processes as well as current mandatories in codes and standards. Experiments have been performed to confirm whether the bent pipes conform to the materials properties and qualities deduced from the analyses. Some results of these tests are presented in this paper.
국내원전에 매설된 콜타르 코팅 배관의 음극방식과 FEM법을 이용한 방식성능 시뮬레이션
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 ) 한국부식방식학회 2017 Corrosion Science and Technology Vol.16 No.3
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.
열취화에 따른 주조 스테인리스강의 재료물성치 저하 예측
이승건(S.G. Lee),박흥배(H.B. Park),진태은(T.E. Jin),송택호(T.H. Song),장창희(C.H. Jang),정일석(I.S. Jeong) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.3
주조 오스테나이트 스테인리스강은 기계적 특성, 부식성 및 용접성 등이 뛰어나 원자력발전소의 1차 계통에 널리 사용되고 있다. 그러나 주조 오스테나이트 스테인리스강은 고온에서 장시간 사용될 때 ‘475℃ 취성’이라고 알려져 있는 열취화 현상이 발생하게 되며 이로 인해 인장강도는 증가하고 연성과 충격에너지 값은 감소하게 되어 안전성에 영향을 미치게 된다. 따라서 열취화 발생기준을 결정하는 것은 주조 스테인리스강의 건전성 평가에 매우 중요하다. 본 논문에서는 일반적인 열취화 기구 및 GALL에서 제시한 열취화 발생기준, 재료물성치 저하 예측 방안을 소개하고 이들 기준을 국내 주조 오스테나이트 스테인리스강 배관에 적용하여 열취화 발생 여부를 검토하였다. 이는 열취화를 고려한 원자력발전소 원자로냉각계통 배관의 파괴역학 해석시 유용하게 활용될 수 있을 것이다.
장현영,김기태,임부택,김경수,김재원,박흥배,김영식,Chang, H.Y.,Kim, K.T.,Lim, B.T.,Kim, K.S.,Kim, J.W.,Park, H.B.,Kim, Y.S. The Corrosion Science Society of Korea 2017 Corrosion Science and Technology Vol.16 No.2
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.