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Evaluation of Limit Loads for Surface Cracks in the Steam Generator Tube

증기발생기 전열관에 존재하는 표면균열의 한계하중 평가

  • 김현수 (한국전력기술(주) 재료기술그룹) ;
  • 김종성 (한국전력기술(주) 재료기술그룹) ;
  • 진태은 (한국전력기술(주) 재료기술그룹) ;
  • 김홍덕 (한국전력공사 전력연구원) ;
  • 정한섭 (한국전력공사 전력연구원)
  • Published : 2006.08.01

Abstract

Operating experience of steam generators has shown that cracks of various morphology frequently occur in the steam generator tubes. These cracked tubes can stay in service if it is proved that the tubes have sufficient safety margin to preclude the risk of burst and leak. Therefore, integrity assessment using exact limit load solutions is very important for safe operation of the steam generators. This paper provides global and local limit load solutions for surface cracks in the steam generator tubes. Such solutions are developed based on three-dimensional (3-D) finite element analyses assuming elastic-perfectly plastic material behavior. For the crack location, both axial and circumferential surface cracks, and for each case, both external and internal cracks are considered. The resulting global and local limit load solutions are given in polynomial forms, and thus can be simply used in practical integrity assessment of the steam generator tubes.

Keywords

Limit Load;Surface Crack;Elastic-Perfectly Plastic Behavior;Free Span;U-Bend

References

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Cited by

  1. Numerical Validations of Flaw Shape Idealization Methods to Burst Pressure Estimations of Steam Generator Tube With Axial Surface Flaws vol.140, pp.1, 2017, https://doi.org/10.1115/1.4038310