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Effect of Preemptive Weld Overlay on Residual Stress Mitigation for Dissimilar Metal Weld of Nuclear Power Plant Pressurizer

예방 용접 Overlay가 원전 가압기 이종금속용접부 잔류응력 완화에 미치는 영향

  • 송태광 (고려대학교 대학원 기계공학과) ;
  • 배홍열 (고려대학교 대학원 기계공학과) ;
  • 전윤배 (고려대학교 대학원 기계공학과) ;
  • 오창영 (고려대학교 대학원 기계공학과) ;
  • 김윤재 (고려대학교 기계공학과) ;
  • 이경수 (한전 전력연구원) ;
  • 박치용 (한전 전력연구원)
  • Published : 2008.10.01

Abstract

Weld overlay is one of the residual stress mitigation methods which arrest crack initiation and crack growth. Therefore weld overlay can be applied to the region where cracking is likely to be. An overlay weld used in this manner is termed a preemptive weld overlay(PWOL). In pressurized water reactor(PWR) dissimilar metal weld is susceptible region for primary water stress corrosion cracking(PWSCC). In order to examine the effect of PWOL on residual stress mitigation, PWOL was applied to a specific dissimilar metal weld of Kori nuclear power plant by finite element analysis method. As a result, strong compressive residual stress was made in PWSCC susceptible region and PWOL was proved effective preemptive repair method for weldment.

Keywords

Preemptive Weld Overlay;PWSCC;Welding Residual Stress;Dissimilar Metal Weld

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