[en] Posiva Oy is responsible for implementing the programme for geological disposal of spent nuclear fuel in Finland. Posiva is currently preparing to submit an application to obtain a construction licence for the Olkiluoto disposal facility by the end of 2012. To prepare for the licensing, the Rock Suitability Criteria (RSC) programme has been set up to develop a classification scheme to define suitable rock volumes for the repository panels, deposition tunnels and deposition holes. The classification scheme considers both long-term safety and engineering aspects. Target properties for the host rock have been defined in terms of the chemical composition and flow of groundwater, as well as transport properties and thermomechanical stability. The work in this report considers the RSC-criteria relating to the fracturing around tunnels and deposition holes and the associated groundwater inflows during open conditions, using the stochastic hydrogeological discrete fracture network (Hydro-DFN) model developed for Olkiluoto Site Descriptive Model 2008. The modelling work consists of a reference case model combined with a suite of variants to assess specific uncertainties or sensitivities