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Crack Stability Evaluation of Nuclear Main Stream Pipe Considering Load Reduction Effect

하중감소효과를 고려한 원자력 주증기 배관의 균열 안정성 평가

  • Koh, Bong-Hwan (Dept.of Mechanical Engineering, Graduate School of Sungkyunkwan University) ;
  • Kim, Yeong-Jin (Dept.of Mechanical Design, Sungkyunkwan University) ;
  • Seok, Chang-Seong (Dept.of Mechanical Design, Sungkyunkwan University)
  • 고봉환 (성균관대학교 대학원, 기계공학과) ;
  • 김영진 (성균관대학교 기계설계학과) ;
  • 석창성 (성균관대학교 기계설계학과)
  • Published : 1996.06.01

Abstract

The objective of this paper is to evaluate the crack stability of the nuclear main stresm pipes, considering the load reduction effect due to the presence of circumferential throuth-wall crack. Also, the optimization techniques are adoped tosimulate the crack effect on the elbow component of the piuping system. By using a general beam elemetn which contains a discontinuous cross-section, the piping analysis is accomplished to acquire the reduced load. Considering this reduced load, it is feasible for the LBB application in nuclear main stresm pipe. Also, by combining an optimization program and a genaral finite element analysis program, the appropriate dimensions of the simplified beam elemtn which represents the effect of crack in elbow could be successfully determined.

Keywords

Leak-Before-Break;J-Intergral;Tearing Modulus;Load Reduction;Optimization