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http://dx.doi.org/10.9711/KTAJ.2022.24.6.451

Design of accelerated life test on temperature stress of piezoelectric sensor for monitoring high-level nuclear waste repository  

Hwang, Hyun-Joong (Dept. of Civil and Environmental Engineering, KAIST)
Park, Changhee (Dept. of Civil and Environmental Engineering, KAIST)
Hong, Chang-Ho (Disposal Performance Demonstration Research Division, KAERI)
Kim, Jin-Seop (Disposal Performance Demonstration Research Division, KAERI)
Cho, Gye-Chun (Dept. of Civil and Environmental Engineering, KAIST)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.24, no.6, 2022 , pp. 451-464 More about this Journal
Abstract
The high-level nuclear waste repository is a deep geological disposal system exposed to complex environmental conditions such as high temperature, radiation, and ground-water due to handling spent nuclear fuel. Continuous exposure can lead to cracking and deterioration of the structure over time. On the other hand, the high-level nuclear waste repository requires an ultra-long life expectancy. Thus long-term structural health monitoring is essential. Various sensors such as an accelerometer, earth pressure gauge, and displacement meter can be used to monitor the health of a structure, and a piezoelectric sensor is generally used. Therefore, it is necessary to develop a highly durable sensor based on the durability assessment of the piezoelectric sensor. This study designed an accelerated life test for durability assessment and life prediction of the piezoelectric sensor. Based on the literature review, the number of accelerated stress levels for a single stress factor, and the number of samples for each level were selected. The failure mode and mechanism of the piezoelectric sensor that can occur in the environmental conditions of the high-level waste repository were analyzed. In addition, two methods were proposed to investigate the maximum harsh condition for the temperature stress factor. The reliable operating limit of the piezoelectric sensor was derived, and a reasonable accelerated stress level was set for the accelerated life test. The suggested methods contain economical and practical ideas and can be widely used in designing accelerated life tests of piezoelectric sensors.
Keywords
High-level nuclear waste repository; Piezoelectric sensor; Accelerated life test; Failure mode; Operating limit;
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Times Cited By KSCI : 1  (Citation Analysis)
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