ABSTRACT
The high-level nuclear waste (HLW) repository is exposed to a number of stresses, including high temperatures, high humidity, and radiation. These stresses cause the structure to deteriorate and create cracks. Therefore, structural health monitoring with monitoring sensors is required for safety. However, sensors could also fail due to the stresses. Given that the sensors are installed in the bentonite buffer and the backfill tunnel, it is impossible to replace them if they fail. That’s why it is necessary to assess the sensors’ durability under the repository’s environmental conditions before installing them. And an accelerated life test can be used for this purpose. In this regard, an accelerated life test can be used. Before conducting the test, the proper stress level must be designed first to get reliable data in a short time. In this study, a methodology for designing stress levels is described.
