DRBEM simulation of radionuclide transport near nuclear waste repository

摘要

Numerical modelling and simulation represent essential tools for evaluation of the safety of nuclear waste repositories. The Dual Reciprocity Boundary Element method (DRBEM) is used in this paper to solve the Darcy-Brinkman equation, and coupled species transport equations of the Pu-241 decay chain near the hypothetic repository. For this purpose, the very recently developed unified DRBEM formulation for nonlinear coupled transport phenomena has been applied. Fully implicit time-discretization, Laplace equation fundamental solution weighting, scaled augmented thin plate spline based dual reciprocity transformation, and constant discontinuous boundary elements are used for space-discretization in two dimensions. The simulations will be used in independent performance assessment of the foreseen Slovenian low and intermediate level radioactive waste repository.