Use of Coupled Geochemical and Transport Calculations for Nuclear Waste Problems

by Ivars Neretnieks, Royal Inst of Technology, Stockholm, Sweden,
Catharina Nyman, Royal Inst of Technology, Stockholm, Sweden,



Document Type: Proceeding Paper

Abstract:

The dissolution and migration of radionuclides from a final repository for radioactive waste is complex chemically. The dissolution and release rates depend on the chemistry and on advective and diffusive transport. The presence of the waste may influence the chemistry by e.g. radiolysis which may change the solubility of several important nuclides as well as of the uranium of the waste matrix itself, if it is spent fuel. Redox and other fronts may evolve in the backfill and rock around the waste. Similar processes have been observed in natural systems. The evolution of a redox front in a uranium mine over long times and distances is used as an example to test the capability and illustrate the use of some coupled transport and chemical codes.

Subject Headings: Chemical wastes | Recycling | Radioactive wastes | Waste management | Waste disposal | Mine wastes | Fuels | Sweden | Europe

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