Quintessa has in-depth understanding of the barrier functions provided by the geosphere for a range of geological disposal concepts, and how these evolve over time due to thermal, hydrological, mechanical and chemical interactions.

Our key strengths are in synthesising relevant information and developing and applying conceptual and mathematical models for the key processes that contribute to the long-term safety of geological disposal including:

  • synthesis of data from site investigations, in-situ and laboratory experiments;
  • conceptual and mathematical modelling of groundwater flow and radionuclide transport in porous and fractured rocks;
  • near-surface hydrology modelling and its coupling to deep groundwater flow;
  • reactive geochemical transport modelling of water-rock-radionuclide systems;
  • multiphase flow of groundwater / gas and groundwater / non-aqueous phase liquid systems;
  • thermal evolution modelling including coupling to hydrogeological, mechanical and chemical processes;
  • conceptual modelling and quantification of mechanical processes affecting the long-term stability of geological disposal facilities;
  • data synthesis, understanding and modelling of radionuclide speciation, solubility and sorption;
  • impacts of complexants, colloids and microbes on radionuclide transport;
  • analysis of natural analogues providing supporting safety aruments; and
  • synthesis of data, conceptual understanding and modelling to provide support to environmental safety cases and an interface to performance assessment.