Study on the 3D site-descriptive model for the HLW disposal site characteristics evaluation

Since the 1950s, various high-level radioactive waste (HLW) management methods have been proposed, including ocean disposal, space disposal, and glacier disposal. One of them, the deep geological disposal, is a direct disposal of HLW that emits high heat and radiation to the bedrock, which is located deep in the underground for completely isolating it from the ecosystem. This study analyzed the necessity and method of SDM to improve the understanding of disposal site characteristics based on site investigation data in the case of Finland and Sweden. These countries are in the stage of construction or construction license permit reviewing by demonstrating the performance of DGR through site investigation and safety assessments over a decade. The center of SDM is a geological model, so it is recommended that they build a 3D structure. Korea Radioactive Waste Agency has carried out preliminary 3D geological modeling based on geological survey data, compiled in the SAR, of Gyeongju LILW repository. The model is currently being complemented by reflecting the results of the second stage site investigation. In order to enhance the understanding of site characteristics, SDM will be constructed by integrating modeling results of groundwater flow, fault and geochemistry.