Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Limit Loads for Circular Wall-Thinned Feeder Pipes Subjected to Bending and Internal Pressure.

원형 감육이 발생한 중수로 피더관의 한계하중 평가

  • Received : 2010.06.07
  • Accepted : 2010.09.06
  • Published : 2010.11.01
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Abstract

Flow Accelerated Corrosion (FAC) occurring during in-service conditions results in localized wall-thinning in the feeder pipes of CANDU. The wall-thinning of the feeder pipes is the main degradation mechanisms affecting the integrity of piping systems. In this paper, we assess the integrity of wall-thinned feeder pipes by limit load analysis. The limit loads for wall-thinning feeder pipes subjected to in-plane bending and internal pressure were determined on the basis of finte element limit analyses. The limit loads are determined from the results of limit analyses of elasticperfectly-plastic materials using the large geometry change. Closed-form approximations of limit load solutions for wall-thinning feeder pipes subjected to in-plane bending and pressure are proposed.

캐나다형 중수로에서 피더관은 가동 중에 유동 가속 부식에 의해 감육이 발생한다. 피더관에 감육이 발생하면 배관 건전성이 떨어진다. 본 논문은 원형 감육이 발생한 피더관에서의 기기신뢰성 평가를 위한 한계 하중을 연구하였다. 유한요소 해석을 통하여 면내 굽힘 하중과 내압을 받는 경우에 대하여 연구하였다. 재료는 대변형 효과를 고려하고 탄성-완전소성 재료로 가정하였다. 원형 감육이 발생한 피더관에 대하여 내압과 닫힘 방향, 열림 방향 굽힘 하중에 대하여 한계하중해를 제시하였다.

Keywords

References

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  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.
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  7. Oh, C.-S., Kim, Y.-J. and Park, C.-Y., 2007, "Plastic Loads of Elbows with Local Wall Thinning Under in-Plane Bending,” International Journal of Fracture, Vol. 145, pp. 63-79. https://doi.org/10.1007/s10704-007-9106-1

Cited by

  1. Limit Loads for Circular Wall-Thinned Feeder Pipes Considering Bend Angle vol.36, pp.3, 2012, https://doi.org/10.3795/KSME-A.2012.36.3.313