Documentation and Applications of the ReactiveGeochemical Transport Model RATEQ (NUREG/CR-6871, Draft Report for Comment)

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Publication Information

Manuscript Completed: March 2005
Date Published: June 2005

Prepared by:
Gary P. Curtis
Water Resources Division
U.S. Geological Survey
345 Middlefield Road, Mail Stop 465
Menlo Park, California 94025

J.D. Randall, NRC Project Manager

Prepared for:
Division of Systems Analysis and Regulatory Effectiveness
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
>Washington, DC 20555-0001

NRC Job Code Y6462

Availability Notice

Abstract

The computer program RATEQ implements a numerical method for simulating reactive transport in porous media. For RATEQ simulations, groundwater flow is simulated using MODFLOW-2000. The reactive transport simulations in RATEQ are built on MT3DMS. RATEQ is intended for a wide range of applications involving biogeochemical reactions governed by rate- or equilibrium-controlled reactions. This report documents the input requirements and the output capabilities of RATEQ. The report also presents a number of example simulations illustrating the capabilities of RATEQ. The example simulations include five benchmark simulations that compare results obtained with RATEQ with results obtained independently. Simulations of U(VI) transport at the UMTRA site near Naturita, CO, are also described. Finally, several addition simulations are included that illustrate the application of RATEQ to problems with immobile zones, redox-controlled reactive transport, and biogeochemical transport.