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


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.


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


  1. Majumdar, S., Bakhtiari, S., Kasza, K. and Park, J. Y., 2002, 'Validation of Failure and Leak-Rate Correlations for Stress Corrosion Cracks in Steam Generator Tubes,' NUREG/ CR-6774
  2. Cochet, B., 1991, 'Steam Generator Tube Integrity,' EPRI NP-6865L, Vol. 1-2
  3. Frederick, G. and Hernalsteen, P., 1990, 'Belgian Approach to Steam Generator Tube Plugging for Primary Water Stress Corrosion Cracking,' EPRI NP-6626SD
  4. Keating, R. and Begley, J., 2001, 'Steam Generator Degradation Specific Management Flaw Handbook,' EPRI TR-1001191
  5. Miller, A. G., 1988, 'Review of Limit Loads of Structures Containing Defects,' International Journal of Pressure Vessels and Piping, Vol. 32, pp. 197-327
  6. Kim, Y. J., Shim, D. J., Huh, N. S. and Kim, Y. J., 2002, 'Plastic Limit Pressures for Cracked Pipes using Finite Element Limit Analyses,' International Journal of Pressure Vessels and Piping, Vol. 79, pp. 321-330
  7. Kim, H. S., Kim, J. S., Jin, T. E., Kim, H. D., and Chung, H. S., 2004, 'Burst Pressure Evaluation for Through-wall Cracked Tubes in the Steam Generator,' Trans. of the KSME (A), Vol. 28, No. 7, pp. 1006-1013
  8. HKS, 2005, 'ABAQUS User's Manual,' Version 6.5

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