Migration case study: Transport of radionuclides in a reducing clay sediment (TRANCOM-II)

The TRANCOM-II project addresses the migration behaviour of radionuclides, identified as important for the long-term safety (Se, U, Pu, Am as analogue for trivalent Pu), in a reducing clay environment, with special emphasis on the role of the Natural Organic Matter (NOM). The main questions are: does the NOM increase the radionuclide concentration in solution due to complexation/colloid formation and what is the possible role of mobile NOM as radionuclide carrier. The objective is to develop and demonstrate a conceptual model for the description of the migration of these radionuclides that can be implemented in performance assessment (PA) models. (authors)