MARNIE, a near field transport model for radioactive waste repositories

The long term safety of a final repository for radioactive waste disposal has to be demonstrated. A number of scenarios can be postulated that could lead to a considerable release of radionuclides from the repository to the biosphere. To analyse the consequences of such scenarios the computer code MARNIE has been developed to simulate the physical processes in the nearfield. In the code MARNIE the repository is considered as a network consisting of pipes and branching modules. The implemented physical models describe all relevant transport phenomena. Results show, that the evolution of the nearfield due to convergence of the salt is described properly. The calculated distribution of the mobilized and transported radionuclides are within the expected ranges