| Summary: | 碩士 === 國立中央大學 === 土木工程學系 === 106 === The problem of the final disposal of used nuclear fuel is an important issue in Taiwan’s energy development and must be addressed. There is a consensus internationally on the final disposal of used nuclear fuels, and the safest and most feasible method is the deep geological disposal.
The construction of deep geological disposal sites is a huge and complex project, and safety is the most important consideration. This study focuses on the temperature field, saturation, and stress of the disposal site. Each analysis is done by the finite element software Abaqus. This study review the work by the Swedish Nuclear Fuel and Waste Management Corporation (SKB) and the Swedish Nuclear Power Inspectorate (SKI). In the analysis, the representative volume unit was used to analyze the single treatment hole. The temperature and the saturation analysis was completed, and the results consistent with the literature. Due to the bentonite swells, additional stress is generated inside the disposal site, which may cause damage to the disposal hole wall and backfill tunnel. In order to understand how to use the moisture swelling function, this study refers to the swelling pressure test provided by the SKB, and obtain the total stress and void ratio consistent with the literature. Subsequent cases were conducted to understand the effects of the moisture swelling pressure in the repository and to confirm whether the materials interact with each other. In the deep geological disposal site, the rock is an important and difficult to change material. When selecting the location of the repository site, many unfavorable factors are difficult to avoid, the crack problem is the most common. In this study, the model with cracks in repository was designed to evaluate the fracture effect and to understand the effect of the resaturation time.
Keyward: deep geological disposal site, Representative volume unit, bentonite, moisture swelling, fracture
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