Limit Loads for Circular Wall-Thinned Feeder Pipes Considering Bend Angle

굽힘각도를 고려한 원형 감육이 발생한 중수로 피더관의 한계하중

  • 배경동 (고려대학교 기계공학과) ;
  • 제진호 (고려대학교 기계공학과) ;
  • 김종성 (국립순천대학교 기계우주항공공학부) ;
  • 김윤재 (고려대학교 기계공학과)
  • Received : 2011.12.06
  • Accepted : 2012.01.11
  • Published : 2012.03.01


In CANDU, feeder pipes supply heavy water to pressure tube and steam generator. Under service conditions, Flow-Accelerated Corrosion (FAC) produces local wall-thinning in the feeder pipes. The wall-thinning in these pipes affects the integrity of the piping system, as verified in previous research. This paper provides limit loads for wallthinned feeder pipes with $45^{\circ}$ and $60^{\circ}$ bend angles, and proposes an equation that predicts the limit loads for wallthinned feeder pipes with arbitrary bend angles. On the basis of finite element limit analyses, limit loads are obtained for wall-thinned feeder pipes under in-plane bending and internal pressure. There are two cases of in-plane bending: the in-plane closing direction and the in-plane opening direction. The material is considered the effect of the large deformation, so an elastic-perfectly-plastic material is assumed in the calculations.


Grant : 중수로 피더관 감육에 대한 구조 건전성 평가 연구

Supported by : 기초전력연구원


  1. Duan, X., Kozluk, M. J. and Li, M., 2009, "Comprehensive Integrity Assessment of Carbon Steel Feeder Pipes/Elbows Subject to Wall Thinning," Proceedings of the ASME 2009 Pressure Vessels and Piping Division Conference, Prague, Czech Republic.
  2. Jin, J. C., Eom, S. and Awad, R., 2008, "Some Issues in Fitness for Service Assessment of Wall Thinned CANDU Feeder Pipes," Proceedings of the ASME 2008 Pressure Vessels and Piping Division Conference, Chicago, USA.
  3. Slade, J. P. and Gendron, T. S., 2005, "Flow Accelerated Corrosion and Cracking of Carbon Steel Piping in Primary Water - Operating Experience at the Point LEPREAU Generating Station," Proceedings of the 12th International Conference on Environmental Degradation of Materials in Nuclear Power System.
  4. ABAQUS user's manual, 2009, Dassault Systemes, Paris, France, Version 6.9.
  5. ASME Boiler and Pressure Vessel Code, Section II, 2007, ASME, New York.
  6. Kim, Y.-J., Kim, J., Ahn, J., Hong, S.-P. and Park, C.- Y., 2008, "Effects of Local Wall Thinning on Plastic Limit Loads of Elbows Using Geometrically Linear FE Limit Analyses," Engineering Fracture Mechanics, Vol. 75, pp. 225-245.
  7. Oh, C.-S., Kim, Y.-J. and Park, C.-Y., "Plastic Loads of Elbows with Local Wall Thinning Under in-Plane Bending," International Journal of Fracture, Vol. 145, pp. 63-79.
  8. Je, J.-H., Lee, K.-H., Chung, H.-J., Kim, J.-S. and Kim, Y.-J., 2010, "Limit Loads for Circular Wall- Thinned Feeder Pipes Subjected to Bending and Internal Pressure," Trans. Of the KSME A, Vol. 34, No. 11, pp.1675-1680.