Understanding Reactive Flow in Fractured Crystalline Bedrock for Safe Nuclear Waste Repositories (FLOP2)

Introduction

The FLOP2 project, funded by the SAFER2028 research programme, aims to advance the long-term safety of subsurface radioactive waste disposal by deepening our understanding of fractured crystalline bedrock. The research focuses on how mineral alterations influence the porosity and permeability which are factors that are critical for the integrity of nuclear waste repositories.

This project builds on the findings and methodologies developed in the first FLOP project (2023–2026). We will use isotopic dating of alteration phases to clarify the temporal evolution of fracture systems and their alteration processes. Furthermore, we will conduct laboratory experiments investigating reactive interactions between near-repository rock and fluids. We will also foster community building and working collaboratively by, e.g., organization of workshops to enhance the applicability of open-source discrete fracture network (DFN) and coupled thermal–hydraulic–mechanical–chemical (THMC) modeling approaches. This combination of methods and networking supports reproducible, transparent workflows and strengthens Finland’s research capacity and confidence in repository performance.

Partners: University of Turku, University of Jyväskylä, Åbo Akademi, Geological Survey of Finland

Project lead: University of Turku

Funding authority: Nuclear Waste Management Fund (VYR)

Contact person: Nikolas Ovaskainen

 

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