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Under in-pile operating conditions, the stress corrosion cracking (SCC) in the Nickel-based 718 alloy grid spring poses a significant risk to the safety of fuel assembly operations. Due to the high temperature and irradiation factors present in the reactors, it is challenging to accurately determine the grid spring’s stress under varying burnup conditions. Regarding the Nickel-based 718 alloy grid of the pressurized water reactor (PWR) fuel assembly as the study object, an analysis method is proposed to simulate the grid spring stress relaxation under in-pile operating conditions. The influence of in-pile environmental factors on the grid spring’s stress and clamping force, such as fast neutron fluence rate and temperature, is researched. In addition, an analysis is conducted on the time-dependent behavior of the grid spring’s stress and clamping force. The analysis results are expected to provide valuable guidance for evaluating SCC performance and end-of-life clamping force of the Nickel-based 718 alloy grid spring.

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Study on the Stress Relaxation Analysis Method of the Nickel-Based 718 Alloy Grid Spring

  • 会议论文

  • 发表日期：

    2026年

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  • Yingzhuo Tang,
  • Shufeng Zhao,
  • Jingya Sun,
  • Zhenxing Wang,
  • Jingjing Zhao,
  • Fujun Gan

摘要

Under in-pile operating conditions, the stress corrosion cracking (SCC) in the Nickel-based 718 alloy grid spring poses a significant risk to the safety of fuel assembly operations. Due to the high temperature and irradiation factors present in the reactors, it is challenging to accurately determine the grid spring’s stress under varying burnup conditions. Regarding the Nickel-based 718 alloy grid of the pressurized water reactor (PWR) fuel assembly as the study object, an analysis method is proposed to simulate the grid spring stress relaxation under in-pile operating conditions. The influence of in-pile environmental factors on the grid spring’s stress and clamping force, such as fast neutron fluence rate and temperature, is researched. In addition, an analysis is conducted on the time-dependent behavior of the grid spring’s stress and clamping force. The analysis results are expected to provide valuable guidance for evaluating SCC performance and end-of-life clamping force of the Nickel-based 718 alloy grid spring.