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Minimum Safety Factor for Evaluation of Critical Buckling Pressure of Zirconium Alloy Tube

지르코늄 합금 관의 임계좌굴 압력 산정을 위한 최소안전율

  • Kim, Hyung-Kyu (LWR Fuel Technology Division, Korea Atomic Energy Research Institute) ;
  • Kim, Jae-Yong (LWR Fuel Technology Division, Korea Atomic Energy Research Institute) ;
  • Yoon, Kyung-Ho (LWR Fuel Technology Division, Korea Atomic Energy Research Institute) ;
  • Lee, Young-Ho (LWR Fuel Technology Division, Korea Atomic Energy Research Institute) ;
  • Lee, Kang-Hee (LWR Fuel Technology Division, Korea Atomic Energy Research Institute) ;
  • Kang, Heung-Seok (LWR Fuel Technology Division, Korea Atomic Energy Research Institute)
  • 김형규 (한국원자력연구원 경수로핵연료기술개발부) ;
  • 김재용 (한국원자력연구원 경수로핵연료기술개발부) ;
  • 윤경호 (한국원자력연구원 경수로핵연료기술개발부) ;
  • 이영호 (한국원자력연구원 경수로핵연료기술개발부) ;
  • 이강희 (한국원자력연구원 경수로핵연료기술개발부) ;
  • 강흥석 (한국원자력연구원 경수로핵연료기술개발부)
  • Received : 2010.12.10
  • Accepted : 2011.01.05
  • Published : 2011.03.01

Abstract

We consider the uncertainty in the elastic buckling formula for a thin tube. We take into account the measurement uncertainty of Young's modulus and Poisson's ratio and the tolerance of the tube thickness and diameter. Elastic buckling must be prohibited for a thin tube such as a nuclear fuel rod that must satisfy a self-stand criterion. Since the predicted critical buckling pressure overestimated that found in the experiment, the determination of the minimum safety factor is crucial. The uncertainty in each parameter (i.e., Young's modulus, Poisson's ratio, thickness, and diameter) is mutually independent, so the safety factor is evaluated as the sum of the inverse of each uncertainty. We found that the thickness variation greatly affects the uncertainty. The minimum safety factor of a thin tube of Zirconium alloy is evaluated as 1.547 for a thickness of 0.87 mm and 3.487 for a thickness of 0.254 mm.

Keywords

Elastic Buckling;Zirconium Alloy Tube;Critical Buckling Pressure;Minimum Safety Factor

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