1. NAME AND TITLE
GETOUT: A Computer Code System for Predicting One-Dimensional Radionuclide Decay Chain
Transport through Geologic Media.
Office of Nuclear Waste Isolation (ONWI), Battelle Project Management Division, Columbus,
3. CODING LANGUAGE AND COMPUTER
Fortran IV; CDC CYBER 176.
4. NATURE OF PROBLEM SOLVED
GETOUT analyzes the convective-dispersive transport of radionuclides in groundwater. The output from the code consists of nuclide discharges at the biosphere.
GETOUT can be used as a site subsystem process code for estimating the nuclide discharges into
biosphere points, following a leach incident at the repository. It is able to interface with NETFLO,
a flow code, and PABLM, a dose-to-man code. The sequential operation of NETFLO, GETOUT, and
PABLM may be used for the total site subsystem assessment.
5. METHOD OF SOLUTION
GETOUT evaluates the analytical solution presented by Lester, Cloninger, and Burkholder,
employing the Laplace transform technique. The basic assumptions in the code are: 1) the flow is one-dimensional so lateral dispersion is neglected; 2) the solution is limited to straight chains; 3) the porous
medium is homogeneous with respect to porosity, bulk density, dispersion coefficient, and retardation
factors for each nuclide; 4) the fluid flow is steady-state and the velocity of water is constant
throughout the column; 5) theoretically, the flow path is infinite; 6) the entire inventory is dissolved
in water without regard to solubility limits.
6. RESTRICTIONS OR LIMITATIONS
(1) For single chain option, the present dimension limits restrict the output to 202 discrete points
in the time coordinate; (2) neglects lateral dispersion; (3) limited to three nuclides per nuclide decay
chain; (4) does not handle branched chains of nuclide decay; (5) some combinations of Peclet and
decay numbers and retardation factors cannot be handled for two-member and three-member chains;
(6) retardation factors for the different nuclides in a chain must be unequal; (7) flow is taken to be in
steady-state; (8) interstitial velocity is taken to be the same throughout the path of travel of nuclides;
and (9) retardation factor for a nuclide is taken to be constant over the path of travel of nuclides.
7. TYPICAL RUNNING TIME
No specific running time is given, but the author states that the strength of the code lies in the small
computer time required in comparison to other numerical nuclide transport codes.
8. COMPUTER HARDWARE REQUIREMENTS
41 K decimal words of memory to load and run on the CDC CYBER 176.
9. COMPUTER SOFTWARE REQUIREMENTS
A Fortran IV compiler is required.
"GETOUT: A Computer Code for One-Dimensional Analytical Solution for Radionuclide
Transport," ONWI-433 (April 1983).
11. CONTENTS OF CODE PACKAGE
Included are the referenced document and one (1.2MB) DOS diskette which contains the source
codes, library, and sample problem input and output.
12. DATE OF ABSTRACT
KEYWORDS: ENVIRONMENTAL DOSE; RADIONUCLIDES; RADIOACTIVITY RELEASE; WASTE MANAGEMENT; LIQUID PATHWAY; NUCLIDE TRANSPORT; ONE-DIMENSION