Journal ArticleDOI
Sensitivity analyses of finite element method for estimating residual stress of dissimilar metal multi-pass weldment in nuclear power plant
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In this paper, the effect of welding variables on residual stress variation is estimated for sensitivity analysis based on 2D and 3D finite element analyses for 6" safety and relief nozzle.Abstract:
In nuclear power plants, ferritic low alloy steel components were connected with austenitic stainless steel piping system through alloy 82/182 butt weld. There have been incidents recently where cracking has been observed in the dissimilar metal weld. Alloy 82/182 is susceptible to primary water stress corrosion cracking. Weld-induced residual stress is main factor for crack growth. Therefore exact estimation of residual stress is important for reliable operating. This paper presents residual stress computation performed by 6” safety & relief nozzle. Based on 2 dimensional and 3 dimensional finite element analyses, effect of welding variables on residual stress variation is estimated for sensitivity analysis. 1. 서 론 최근 V.C Summer 원전 등에서 이종금속용접부 (Dissimilar Metal Weld) 균열이 관찰되었다. (1~3) 균열은 Inconel 계열 용접 금속에서 발생하였으며 일차수응력부식균열(PWSCC)이 균열의 주요 발생 원인이었다. 일차수응력부식균열은 재료의 민감도, 용접부 인장 잔류 응력 및 사용 중 하중(In-service load), 부식 환경과 같은 3가지 인자의 상호작용에 의해 발생한다. (2,4,5)read more
Citations
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Journal ArticleDOI
Three-dimensional finite element welding residual stress analysis of penetration nozzles: I – Sensitivity of analysis variables
TL;DR: In this paper, the effects of variables related to 3D finite element welding residual stress analyses of penetration nozzles on residual stresses were investigated, including number of elements in the circumferential direction, number of beads, kinematic boundary conditions, model angle, and detailed weld shape.
Journal ArticleDOI
Evaluation of J-groove weld residual stress and crack growth rate of PWSCC in reactor pressure vessel closure head
Seung Hyuk Oh,Tae Young Ryu,Seung Hyun Park,Min Gu Won,Seok Jun Kang,Kyoung Soo Lee,Sung Ho Lee,Moon Ki Kim,Jae-Boong Choi +8 more
TL;DR: In this article, a three-dimensional finite element analysis with an actual asymmetric J-groove weld model and process of construction was performed to investigate the crack growth rate of PWSCC from cracks applied on the penetration nozzles.
Journal ArticleDOI
Effects of Similar Metal Weld on Residual Stress in Dissimilar Metal Weld According to Safe End Length
Tae Kwang Song,Yun Bae Chun,Chang Young Oh,Hong Yeol Bae,Yun Jae Kim,Sang-Hoon Lee,Kyoung Soo Lee,Chi Yong Park +7 more
TL;DR: In this article, a simple nozzle model which covers various radius to thickness ratios was proposed to quantify residual stress in dissimilar metal weld based on finite element analyses, and the critical effective length of safe end was provided according to the radius-to-thickness ratio.
Journal ArticleDOI
Effects of Geometry of Reactor Pressure Vessel Upper Head Control Rod Drive Mechanism Penetration Nozzles on J-Groove Weld Residual Stress
Ju-Hee Kim,Yun Jae Kim,Sung-Ho Lee,Nam-Young Hur,Hong-Yeol Bae,Chang-Young Oh,Ji Soo Kim,Heung-Bae Park,Seung-Geon Lee,Jong Sung Kim,Nam-Su Huh +10 more
TL;DR: In this paper, detailed finite-element simulations for the Korea nuclear Reactor Pressure Vessel have been conducted in order to predict the magnitudes of the weld residual stresses in the tube materials.
Journal ArticleDOI
Sensitivity analysis of finite element parameters for estimating residual stress of J-groove weld in RPV CRDM penetration nozzle
TL;DR: In this paper, the authors present the residual stress computation performed for an upper head control rod drive mechanism (CRDM) penetration nozzle in Korea based on two and three dimensional finite element analyses, the effect of welding variables on residual stress variation is estimated for sensitivity analysis.
References
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Journal ArticleDOI
A parametric study of residual stresses in multi-pass butt-welded stainless steel pipes
B. Brickstad,B.L. Josefson +1 more
TL;DR: In this paper, the through-thickness variation at the weld and heat affected zone, of the axial and hoop stresses and their sensitivity to variation in weld parameters are studied.
Journal ArticleDOI
Welding Residual Stresses and Effects on Fracture in Pressure Vessel and Piping Components: A Millennium Review and Beyond
Pingsha Dong,Frederick W. Brust +1 more
TL;DR: In this paper, the recent advances in weld residual stress modeling procedures are reviewed within the context of pressure vessel and piping applications, and the future needs in improved fracture mechanics procedures by incorporating the rapidly expanding knowledge on weld residual stresses are summarized.
Journal ArticleDOI
Residual stress simulation in thin and thick-walled stainless steel pipe welds including pipe diameter effects
TL;DR: In this paper, residual stresses in welded components are discussed and a brief review of weld simulation is presented and the general methodology of the FE analysis methods used for welded sections of steel pipes is explained.
Journal ArticleDOI
The ASME boiler and pressure vessel code
J.W. Stokes,L. Holly,K.H. Mayer +2 more
TL;DR: The ASME Boiler and Pressure Vessel Code (BPV Code) as discussed by the authors is the most widely used boiler and pressure vessel code in the world and has been adopted as by-laws in most states.
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