postclosure safety
assessment modelling

For the past 25 years, Geofirma Engineering has been responsible for the detailed flow and transport modelling required for various investigations into the postclosure safety of Deep Geologic Repositories (DGRs) in Canada, including:
• The proposed OPG Low & Intermediate Level Waste DGR proposed for the Bruce site.
• Theoretical and proposed sedimentary and crystalline sites for a High-Level Waste DGR in Ontario.
• A proposed fractured crystalline site for a High-Level Waste DGR in northern Ontario.

Over the course of these projects, Geofirma has created two-dimensional and three-dimensional models of the proposed DGRs, including detailed fracture networks at crystalline sites, and has modelled flow, radionuclide transport and gas transport over the 1 to 10 million year assessment time frames. These models have been updated over the years to take into consideration theoretical and proposed DGR locations, new data and new repository designs. Modelling studies have considered glaciation, probabilistic assessment, resaturation and other flow and transport processes.

For additional information, please contact Nicola Calder.