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

This NUREG publication has been issued for public comment. Comment period is now closed.

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Abstract

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NUREG/CR-6871 (PDF - 5.75 MB)

Publication Information

Manuscript Completed: March 2005
Date Published: June 2005

Prepared by
G.P. Curtis

U.S. Geological Survey
Menlo Park, CA 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

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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.