The SECO Suite of Codes for Site Performance Assessmentby Patrick J. Roache, Ecodynamics Research Associates, Albuquerque, United States,
Document Type: Proceeding Paper
Part of: High Level Radioactive Waste Management 1993
Modeling for performance assessment of the Waste Isolation Pilot Plant (WIPP) has led to development of the SECO suite of codes for groundwater flow, particle tracking, and transport. Algorithm and code developments include the following areas: facilitation of grid convergence tests in multiple domains; correct treatment of transmissivity factors for unconfined aquifers; efficient multigrid algorithms; a formulation of brine Darcy flow equations that uses freshwater head as the dependent variable; boundary-fitted coordinates; temporal high order particle tracking; an efficient and accurate implicit finite volume TVD algorithm for radionuclide transport in (possibly) fractured porous media; accurate calculation of advection via a flux-based modified method of characteristics; and quality assurance procedures.
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