Prediction of fault seal integrity has been identified as a major technology gap and obstacle for qualification of CO2 storage within faulted reservoirs with structural traps. Existing workflows and methods have limitations when it comes to including along-fault flow and dynamic changes related to increasing reservoir pressure during injection. The FRISK proposal has the ambitions to improve the fundamental understanding of fluid flow in faults and contribute to a better framework for fault derisking with application for CO2 site qualification. The proposed research activities is focused towards the Smeahia case study and includes: (1) mapping and quantification of fault complexity as a base for 3D risking of faults, (2) constrain static and dynamic fault flow properties from experimental data and field observations, (3) develop effective along-fault flow models and (4) quantify uncertainty in key controlling parameters and leakage rates. The main findings will be integrated and synthesised to quantify the fault related leakage-risk and outline how the new findings may contribute to the structural derisking for Smeaheia. Reduced uncertainty in fault related leakage risk may enable qualification of potential geological CO2 storage sites in the North Sea. Hence, the FRISK project answers directly to the priority area of the CLIMIT call on Large-scale storage of CO2 on the Norwegian shelf in the North Sea.