Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Stress evaluation method of reinforced wall-thinned Class 2/3 nuclear pipes for structural integrity assessment

  • Jae-Yoon Kim (Department of Mechanical Engineering, Korea University) ;
  • Je-Hoon Jang (Department of Mechanical Engineering, Korea University) ;
  • Jin-Ha Hwang (Department of Mechanical Engineering, Pukyong National University) ;
  • Yun-Jae Kim (Department of Mechanical Engineering, Korea University)
  • Received : 2023.03.07
  • Accepted : 2023.11.19
  • Published : 2024.04.25
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Abstract

When wall-thinning occurs in nuclear Class 2 and 3 pipes, reinforcement is typically applied rather than replacement. To analyze the structural integrity of reinforced wall-thinned pipe, stress analysis results using full 3-D FE analysis are not compatible to the design code equation, ASME BPVC Sec. III NC/ND-3650. Therefore, the efficient stress evaluation method for the reinforced wall-thinned pipe, compatible to the design code equation, needs to be developed. In this paper, stress evaluation methods for the reinforced wall-thinned pipe are proposed using the equivalent straight pipe concept. Furthermore, for fatigue analysis of the reinforced wall-thinned pipe, the stress intensification factor of reinforced wall-thinned pipe is presented using the structural stress method given in ASME BPVC Sec. VIII Div.2.

Keywords

Acknowledgement

This work was supported by Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (No. 20206510100030, Development of Repair Technology for Class 2, 3 Large Bore Piping in Operating Nuclear Power Plant).

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