Acta Montanistica Slovaca (Jan 2007)
Status and development of deep geological repository in Slovak republic from geological point of view
Abstract
During the operation of Slovak NPPs, production of approximately 2,300 metric tons of spent fuel expressed as heavy metal (18,654 spent fuel assemblies) is expected. In addition, about 5000 metric tons of radioactive waste unfit for near surface repository at Mochovce and destined for a deep geological disposal. The safe and long-term solution of back-end fuel cycle is so highly required.One of the most favorable solutions is Deep Geological Repository (DGR). The site for a DGR, along with repository design and the engineered barrier system must ensure long-term safety of the disposal system.A preliminary set of site-selection criteria for a DGR was proposed in Slovakia, based on worldwide experience and consistent with IAEA recommendations. Main groups of criteria are: 1) geological and tectonic stability of prospective sites; 2) appropriate characteristics of host rock (lithological homogeneity, suitable hydrogeological and geochemical conditions, favourable geotechnical setting, absence of mineral resources, etc.); 3) conflict of interests (natural resources, natural and cultural heritage, protected resources of thermal waters, etc.).Based on the previous geological investigations, three distinct areas (five localities) were determined as the most prospective sites for construction of a DGR so far. Three of them are built by granitoids rock (Tribeč Mts., Veporske vrchy Mts. and Stolicke vrchy Mts.), other consist of sedimentary rock formations (Cerova vrchovina Upland and Rimavska kotlina Basin). Objective for the next investigation stage is to perform more detailed geological characterization of the prospective sites.
