Speaker
Antti Poteri
Description
DFN-based modelling is essential for capturing the heterogeneity of the bedrock and enabling credible mechanical, flow, and transport modelling of the site. This presentation examines how fracture data are translated into discrete fracture network (DFN) models to support the safety case for a geological repository, with a focus on flow and transport pathways in fractured rock. The central challenge is not only to describe fracture geometry, but also to determine which fractures are hydraulically connected and actively carry flow. The application of DFN modelling at Olkiluoto is illustrated through examples from Posiva’s latest safety case.