Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2019, Vol. 30 ›› Issue (5): 77 doi: 10.1007/s41365-019-0604-4

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Risks of non-conservative design according to ASME B31.1 for high-temperature piping subjected to long-term operation in the creep range

Hyeong-Yeon Lee1 • Seok-Kwon Son2 • Min-Gu Won3 • Ji-Young Jeong1   

  1. 1 Korea Atomic Energy Research Institute, 989-111 Daedeok-daero Daejeon, Republic of Korea
    2 National Fusion Research Institute, 169-148 Gwahak-Ro, Yuseong-gu, Daejeon, Republic of Korea
    3 School of Mechanical Engineering, Sungkyunkwan University, Soeburo, Suwon, Republic of Korea
  • Received:2018-11-13 Revised:2018-12-07 Accepted:2018-12-28
  • Contact: Hyeong-Yeon Lee E-mail:hylee@kaeri.re.kr
  • Supported by:
    This work was supported by National Research Foundation Grants (NRF-2012M2A8A2025635 and NRF-2017K1A3A7A03086464) funded by the Korean Government (Ministry of Science, ICT and Future Planning).
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Hyeong-Yeon Lee, Seok-Kwon Son, Min-Gu Won, Ji-Young Jeong. Risks of non-conservative design according to ASME B31.1 for high-temperature piping subjected to long-term operation in the creep range.Nuclear Science and Techniques, 2019, 30(5): 77     doi: 10.1007/s41365-019-0604-4

Abstract: This study investigates the risks of non-conservative piping design according to ASME B31.1 for high-temperature piping subjected to long-term operation at high temperature in a creep regime based on a sensitivity analysis of the hold time. Design evaluations of high-temperature piping were conducted over a range of hold times in the creep regime according to ASME B31.1, which implicitly considers the creep effects, and the French high-temperature design code of the RCC-MRx, which explicitly considers the creep effects. Conservatisms were quantified among the codes in terms of the hold times. In the case of B31.1, the design evaluation results do not change depending on the hold time at high temperature, whereas in the case of RCC-MRx, they do. It was shown that the design limits of RCC-MRx were exceeded when the hold time exceeded certain values, whereas those of B31.1 were satisfied regardless of the hold times. Thus, the design evaluations according to B31.1 did not consistently yield conservative results and might lead to non-conservative results in the case of long-term operations in the creep range.

Key words: ASME B31.1, Creep, Hold time, High-temperature piping, RCC-MRx, Sensitivity analysis