Geomechanics and Engineering

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Lifespan assessment of piezoelectric sensors under disposal condition of high-level nuclear waste repository

  • Changhee Park (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology) ;
  • Hyun-Joong Hwang (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology) ;
  • Chang-Ho Hong (Disposal Performance Demonstration R&D Division, Korea Atomic Energy Research Institute) ;
  • Jin-Seop Kim (Disposal Performance Demonstration R&D Division, Korea Atomic Energy Research Institute) ;
  • Gye-Chun Cho (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology)
  • Received : 2023.11.22
  • Accepted : 2024.02.02
  • Published : 2024.09.10
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Abstract

A high-level nuclear waste (HLW) repository is designed for the long-term disposal of high-level waste. Positioned at depths of 500-1000 meters, it offers an alternative to the insufficient storage space for spent fuels, providing a long-term solution. High-level waste emits heat and radiation, causing structural deterioration, including strength reduction and cracks. Therefore, the use of piezoelectric sensors for structural health monitoring is essential for evaluating the safety of the structure over time. Unlike other structures, the HLW repository restricts human access after the disposal of HLW, rendering sensor replacement impossible. Therefore, it is necessary to assess both the lifespan and suitability of sensors under the disposal conditions in the HLW repository. This study employed an accelerated life test (ALT) to assess the sensor's lifespan under disposal conditions. Failure modes, failure mechanisms, and operational limits were analyzed through accelerated stress test (AST). Additionally, the parameters of the Weibull life probability distribution and the Arrhenius accelerated life model were estimated through statistical methods, including the likelihood ratio test, maximum likelihood estimation, and hypothesis testing. Results confirmed that the sensor's lifespan decreases significantly with the increase in the temperature limit of the HLW repository. The findings of this study can be used for improving sensor lifespan through shielding, development of alternative sensors, or lifespan evaluation of alternative monitoring sensors.

Keywords

Acknowledgement

This research was supported by the Nuclear Research and Development Program of the National Research Foundation of Korea (2022M2E3A3015608) funded by the Minister of Science and ICT. The first author was supported by the Innovated Talent Education Program for Smart Cities of MOLIT.

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