地下處置法是利用：廢料處置桶、緩衝材料、回填材料、以及埋設處本身岩體所形成的多重障壁來達到阻隔及延緩核種向外遷移之目的，使得核種到達地面時，其放射性已衰變至對人體無害的程度。緩衝材料的主要功能之一為：消散由放射性廢料產生之衰變熱能，以避免廢料處置桶因過熱而產生破壞，使核種得以向外遷移。 研究內容首先針對實驗進行數值模擬，利用數值與實驗結果來進行分析與探討，以尋求適當之計算緩衝材料熱傳導係數的方法。 其次針對邊界情形(有無隔熱裝置)、熱阻效應、施加熱能、不同土樣等可能影響實驗量測結果之參數進行分析，用以尋求更佳之實驗模式。 最後進行一案例分析，此分析之目的在於了解不同緩衝材料會對處置場溫度消散有何程度之影響。 Radioactive wastes are required to be isolated from the environment to prevent possible contamination. The disposal concept presently being considered is “deep geological disposal ”. In an underground disposal site, the radioactive wastes are encapsulated in containers surrounded by a buffer material and excavation backfilled. The study aims at determining the proper time interval to calculate the thermal conductivity of the buffer material, and using the actual heat conductivity of the sample known to evaluate the influence of different factors. The aim of these calculations was to develop the most appropriate test and evaluation method.
