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Crack Growth Analysis due to PWSCC in Dissimilar Metal Butt Weld for Reactor Piping Considering Hydrostatic and Normal Operating Conditions

수압시험 및 정상운전 하중을 고려한 원자로 배관 이종금속 맞대기 용접부 응력부식균열 성장 해석

  • Lee, Hwee-Sueng (Dept. of Mechanical System Design Engineering, Seoul Nat'l Univ. of Science and Technology) ;
  • Huh, Nam-Su (Dept. of Mechanical System Design Engineering, Seoul Nat'l Univ. of Science and Technology) ;
  • Lee, Seung-Gun (KEPCO Engineering & Construction Company) ;
  • Park, Heung-Bae (KEPCO Engineering & Construction Company) ;
  • Lee, Sung-Ho (KHNP Central Research Institute)
  • 이휘승 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 허남수 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 이승건 ;
  • 박흥배 ;
  • 이성호 (한국수력원자력(주) 중앙연구원)
  • Received : 2012.08.02
  • Accepted : 2012.09.03
  • Published : 2013.01.01

Abstract

This study investigates the crack growth behavior due to primary water stress corrosion cracking (PWSCC) in the dissimilar metal butt weld of a reactor piping using Alloy 82/182. First, detailed finite element stress analyses were performed to predict the stress distribution of the dissimilar metal butt weld in which the hydrostatic and the normal operating loads as well as the weld residual stresses were considered to evaluate the stress redistribution due to mechanical loadings. Based on the stress distributions along the wall thickness of the dissimilar metal butt weld, the crack growth behavior of the postulated axial and circumferential cracks were predicted, from which the crack growth diagram due to PWSCC was proposed. The present results can be applied to predict the crack growth rate in the dissimilar metal butt weld of reactor piping due to PWSCC.

Keywords

Dissimilar Metal Butt Weld;Hydrostatic Testing;Normal Operating Condition;Welding Residual Stress;Primary Water Stress Corrosion Cracking

Acknowledgement

Supported by : 한국수력원자력(주) 중앙연구원

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  1. Stress Distribution in the Dissimilar Metal Butt Weld of Nuclear Reactor Piping due to the Simulation Technique for the Repair Welding vol.37, pp.5, 2013, https://doi.org/10.3795/KSME-A.2013.37.5.649
  2. Stress Distributions at the Dissimilar Metal Weld of Safety Injection Nozzles According to Safe-end Length and SMW Thickness vol.39, pp.10, 2015, https://doi.org/10.3795/KSME-A.2015.39.10.979