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Tunnelsystem in einem Endlager für radioaktive Abfälle

RepoTREND: Repository Safety Analysis

For a long-term assessment of the safety of final repositories for radioactive waste, the program package RepoTREND (Transport and REtention of Non-decaying and Decaying contaminants in a final REPOsitory) is being developed and applied by GRS. In this program package, all relevant processes which contribute to the mobilisation and release of contaminants from the repository, transport through the host rock and adjacent rock formations as well as exposure in the biosphere have been implemented.

A final repository for radioactive waste could be considered as consisting of three compartments: the near-field, the far-field, and the biosphere. RepoTREND is modularly designed corresponding to this subdivision and provides computational modules for the simulation of the processes in each compartment.

Components of version 4.5 of RepoTREND

Near-field computational modules:

  • LOPOS – radionuclide mobilisation and one-phase transport in a repository in salt rock,
  • CLAYPOS – one-phase diffusive transport through a fully saturated clay barrier,

Farfield computational modules (GeoTREND-Family) for simulating the contaminant transport in fully saturated media:

  • POSA – porous media,
  • FRAME – porous-fractured media,
  • COFRAME – porous-fractured media in the presence of colloids,
  • Biosphere computational module BioTREND for calculating of annual effective doses and certain safety indicators,
  • Flexible configurable graphical user interface XENIA for entering the model parameters,
  • Framework for statistical analyses RepoSTAR.

Currently, the new computational module NaTREND for simulating the release of contaminants and their two-phase transport through the near field is being developed.

Project highlights Disposal

Mann liegt im Gras und arbeitet an einem Laptop
THEREDA: Thermodynamic reference database
2006 - 2025

The main objective of THEREDA is the creation of a comprehensive, internally consistent thermodynamic reference database for geochemical modelling, with the work focusing on the special conditions in the near-field of a repository for radioactive waste in Germany.

RESUS - a scientific basis for weighing up geologically suitable sites
2018 - 2020

Germany is searching for a site for a repository for high-level radioactive waste. According to the Site Selection Act, the site with the best-possible safety is be found by means of a comparative procedure. But how can the requirements of the law be transformed into concrete scientific requirements? Together with other institutions, GRS researchers now present a first approach.