Natural Tracer Profiles Across Argillaceous Formations

The CLAYTRAC Project

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This technical report describes the results of the Nuclear Energy Agency's CLAYTRAC project, in which natural tracer data from nine sites was evaluated to assess potential impacts of disposal of radiological waste in geological repositories. It shows scientific information from numerous sites and applies robust analytical methods to improve the understanding of radionuclide migration and evolution of sites for deep geological disposal. These results improve the understanding of sites, and thus the confidence in safety, for geological disposal of radioactive waste.



Results of Model Calculations

Nuclear Energy Agency

Model runs are called “base-case” calculations if the simulations explain the measured data reasonably well with input parameters and scenarios that are within the independently derived ranges. All base cases consider diffusion as the only transport process – not by definition but due to the observation that adding advection does not improve the model fits to the data. In contrast, “scoping” or “alternative” models refer to cases that purposely deviate from known palaeo-hydrogeological scenarios and ranges of input parameters, or to cases that are not sufficiently well constrained by independent information and therefore remain on a hypothetical level. 


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