Stability and Buffering Capacity of the Geosphere for Long-term Isolation of Radioactive Waste

Application to Crystalline Rock

image of Stability and Buffering Capacity of the Geosphere for Long-term Isolation of Radioactive Waste
Geological settings selected as potential host formations for the deep geological disposal of radioactive waste are chosen for, among other assets, their long-term stability and buffering capacity against destabilising events and processes. These proceedings present the outcomes of a geosphere stability workshop, held in November 2007, that focused on crystalline and other types of hard, fractured rocks. The workshop underscored the fact that many such rocks are intrinsically stable environments that evolve extremely slowly and provide good buffering against external events and processes.

The proceedings show a good understanding of the processes and events that can affect crystalline rocks and, although there is less confidence in predicting exactly when and where such events will occur and the volume of rock that will be affected, the extent of the impacts on a geological repository can be confidently addressed using bounding approaches supported by geological information from similar sites around the world.



Poster Session

Nuclear Energy Agency

Posiva, the nuclear waste management organization in Finland, is currently constructing an underground research facility at the Olkiluoto site. The Olkiluoto Modelling Task Force (OMTF) has been established for planning and integrating the results and the modelling work in the different supporting disciplines. The main duty of the OMTF is to develop site descriptive models of the Olkiluoto site, as well as predicting and evaluating the disturbance created by construction of the ONKALO ramp and characterization tunnels. Various approaches are utilised including crossdiscipline workshops to ensure a common basis for modelling; prediction/outcome studies; and carrying out an overall confidence assessment are key synthesizing and integrating tools. The resulting geosynthesis is reported in a series of Site Reports. Future updates of the Site Report will be part of the Safety Case portfolio supporting a licence application for constructing a final repository for Finland’s spent nuclear fuel at the site. 


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