DOI QR코드

DOI QR Code

Coalescence Pressure of Steam Generator Tubes with Two Different-Sized Collinear Axial Through-Wall Clacks

길이가 다른 두 개의 축방향 관통균열이 동일선상에 존재하는 증기발생기 세관의 균열 합체 압력

  • 허남수 (성균관대학교 기계공학부) ;
  • 장윤석 (성균관대학교 기계공학부) ;
  • 김영진 (성균관대학교 기계공학부)
  • Published : 2006.10.01

Abstract

To maintain the structural integrity of steam generator tubes, 40% of wall thickness plugging criterion has been developed. The approach is for the steam generator tube with single crack, so that the interaction effect of multiple cracks can not be considered. Although, recently, several approaches have been proposed to assess the integrity of steam generator tube with two identical cracks whilst actual multiple cracks reveal more complex shape. In this paper, the coalescence pressure of steam generator tube containing multiple cracks of different length is evaluated based on the detailed 3-dimensional (3-D) elastic-plastic finite element (FE) analyses. In terms of the crack shape, two collinear axial through-wall cracks with different length were considered. Furthermore, the resulting FE coalescence pressures are compared with FE coalescence pressures and experimental results for two identical collinear axial through-wall cracks to quantify the effect of crack length ratio on failure behavior of steam generator tube with multiple cracks. Finally, based on 3-D FE results, the coalescence evaluation diagrams were proposed.

Keywords

Coalescence Pressure;Collinear Axial Through-Wall Crack;Elastic-Plastic Finite Element Analysis

References

  1. USNRC, 1996, 'Steam Generator Tube Failures,' NUREG/CR-6365
  2. USNRC, 1976, 'Bases for Plugging Degraded PWR Steam Generator Tubes,' Regulatory Guide 1.121
  3. ASME, 1998, 'Rules for Construction of Nuclear Power Plant Components,' ASME Boiler and Pressure Vessel Code, Section III
  4. Yu, Y.I., Kim, I.H., Kim, Y. and Kim, Y.I., 1994, 'Development of Steam Generator Tube Plugging Criteria for Axial Crack,' International Conference on Pressure Vessels and Piping, Vol. 280, pp. 79-83
  5. Cochet, B. and Flesch, B., 1987, 'Crack Stability Criteria in Steam Generator Tubes,' 9th International Conference on Structural Mechanics in Reactor Technology, Vol. D, pp. 413-419
  6. Gorman, J.A, Harris, J.E. and Lowenstein, D.B., 1995, 'Steam Generator Tube Fitness-for-Service Guidelines,'AECB Report, No. 2.228.2
  7. Lee, I.H., Park, Y.w., Song, M.H., Kim, Y.I. and Moon, S.l., 2000, 'Determination of Equivalent Single Crack Based on Coalescence Criterion of Collinear Axial Cracks,' Nuclear Engineering and Design, Vol. 205,pp.1-11 https://doi.org/10.1016/S0029-5493(00)00368-X
  8. Moon, S.I., Kim, Y.J. and Lee, J.H, 2003, 'Estimation of Plastic Collapse Load of Steam Generator with Two Parallel Axial Through-Wall Cracks,' International Conference on Pressure Vessels and Piping, Vol. 464, pp. 223-230
  9. Moon, S.I., Chang, Y.S., Kim, Y.J., Lee, J.H., Song, M.H., Choi, Y.H. and Hwang, S.S., 2004, 'Evaluation of Plastic Collapse Behavior for Multiple Cracked Structures,' Transactions of the KSME(A), Vol. 28, No 11, pp. 1813-1821 https://doi.org/10.3795/KSME-A.2004.28.11.1813
  10. ASTM International, 2001,' Standard Test Methods for Tension Testing of Metallic Materials,' American Society for Testing and Materials Standard, E8M.
  11. 'ABAQUS User's manual,' ABAQUS, Inc., 2003