Preliminary Geological Characterization and 3D Modeling for a Radioactive Waste Repository in Korea

Understanding the geological characteristics of potential sites is essential for ensuring the long-term safety of high-level radioactive waste repositories. In Korea, studies on geological disposal have been limited compared to other countries, making it crucial to develop site-specific models to assess the long-term stability of the geosphere. This study focuses on the geological characterization and conceptual modeling of a potential test site for a deep geological repository.

The core objective of our research is to construct a site descriptive model that comprehensively characterizes the geological features influencing the stability of a repository. Our approach involves detailed analyses of lithological distributions, fault damage zones, and deformation structures. By integrating surface geological surveys, borehole data, and geophysical measurements, we aim to create a reliable framework for assessing subsurface conditions. Particular attention is given to defining buffer zones through respect distance criteria from major faults, ensuring that disposal facilities are placed in geologically stable areas. This conceptual framework serves as the foundation for further geomechanical and hydrogeological assessments.

To develop this site descriptive model, we first conducted 3D geological modeling as a key preliminary study. Our methodology included linear structure analysis, geological map interpretation, and surface geological investigations. These steps were crucial in identifying and visualizing both regional and local geological features in three dimensions. The resulting 3D geological model provides a detailed visualization of the subsurface environment, offering insights critical for repository site selection and design.

Our study emphasizes the importance of detailed geological investigations and advanced modeling techniques in the assessment of potential radioactive waste repository sites. By establishing a comprehensive framework for characterizing subsurface conditions, we contribute to Korea’s long-term radioactive waste management strategies, aligning with international best practices for ensuring the geosphere’s long-term stability.