FTRANS: A Two-Dimensional Code for Simulating Fluid Flow and Transport of Radioactive Nuclides in Fractured Rock for Repository Performance Assessment

摘要

FTRANS (Fractured Flow and Transport of RAdio-NuclideS) is a two-dimensional finite element code designed to simulate ground-water flow and transport of radioactive nuclides in a fractured porous medium. The code was developed under the SCEPTER project. This documentation describes the mathematical equations of the physical system being modeled, the numerical techniques employed, and the code organization of code utility. The FTRANS code takes into account: (a) fluid interactions between the fractures and porous matrix blocks; (b) advective-dispersive transport in the fractures and diffusion in the porous matrix blocks; and (c) chain reactions of radionuclide components. Major advantages of FTRANS are: (a) capability to model the fractured system using either the dual-porosity or the discrete-fracture modeling approach or a combination of both; and (b) capability to simulate both flow and transport in the same code. FTRANS can be used to perform two-dimensional near-field or far-field predictive analyses of ground-water flow and to perform risk assessments of radionuclide transport from nuclear waste repository subsystems to the biosphere. (ERA citation 08:040325)