AN APPROACH FOR SOLVING RADIONUCLIDE MIGRATION IN FRACTURED MEDIA USING LAPLACE TRANSFORM GALERKIN METHOD

Abstract

This paper describes an approach for solving radionuclide migration in fractured media. In this approach, a three-dimensional heterogeneous channel network system is constructed using a stochastic discrete fracture network (DFN) simulator. The Laplace transform Galerkin finite element method was adopted to solve radionuclide migration in a complex network system for a long period of time effectively. Preliminary radionuclide migration analysis was performed for fifty realization of a block-scale DFN model. The total radionuclide release from all packages in the repository was estimated from the statistics of the results of fifty realizations under the hypothesis of ergodicity. From the result, it was found that large water-conducting features have significant impacts on the radionuclide release from the repository, and thus are important for the performance assessment of geosphere.