NESC9853 MMT.
MMT, 1-D Radionuclide Groundwater Transport
NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES
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| Program name | Package id | Status | Status date |
|---|---|---|---|
| MMT | NESC9853/01 | Tested | 09-FEB-1988 |
Machines used:
| Package ID | Orig. computer | Test computer |
|---|---|---|
| NESC9853/01 | CDC CYBER 176 | CDC CYBER 740 |
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3. DESCRIPTION OF PROGRAM OR FUNCTION
MMT (Multicomponent Mass Transport) solves the one-dimensional equation for transport of radionuclides in a ground-water system with uniform velocity and transport properties. The purpose of the code is to evaluate radionuclide release rates from the site subsystem. MMT treats convective transport, sorption-desorption effects, and hydrodynamic dispersion. Sorption and desorption of radionuclides are taken into account by application of retardation factors which are spatially uniform and derived from bulk rock properties and average geochemical data. Dispersion along the direction of flow (forward and backward) is also taken into account.
MMT (Multicomponent Mass Transport) solves the one-dimensional equation for transport of radionuclides in a ground-water system with uniform velocity and transport properties. The purpose of the code is to evaluate radionuclide release rates from the site subsystem. MMT treats convective transport, sorption-desorption effects, and hydrodynamic dispersion. Sorption and desorption of radionuclides are taken into account by application of retardation factors which are spatially uniform and derived from bulk rock properties and average geochemical data. Dispersion along the direction of flow (forward and backward) is also taken into account.
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4. METHOD OF SOLUTION
Because the code solves only the one- dimensional transport equation, dispersion transverse to the direction of flow is not evaluated. A discrete-parcel-random-walk (DPRW) approach is used to solve the coupled equations. This numerical technique is inherently stable and minimizes computational errors that lead to apparent mass nonconservation.
Because the code solves only the one- dimensional transport equation, dispersion transverse to the direction of flow is not evaluated. A discrete-parcel-random-walk (DPRW) approach is used to solve the coupled equations. This numerical technique is inherently stable and minimizes computational errors that lead to apparent mass nonconservation.
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NESC9853/01
The test case included in the package was executed by the NEA-DB on a CDC CYBER 740 computer in 192 seconds of CPU time.[ top ]
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10. REFERENCES
- J.F. Washburn, F.E. Kaszeta, C.S. Simmons, and C.R. Cole,
Multicomponent Mass Transport Model: A Model for Simulating
Migration of Radionuclides in Ground Water,
PNL-3179, July 1980.
- S.W. Ahlstrom, H.P. Forte, R.C. Arnett, C.R. Cole and R.J. Serne,
Multicomponent Mass Transport Model: Theory and Numerical
Implementation (Discrete-Parcel-Random-Walk Version),
BNWL-2127, May 1977.
- J.F. Washburn, F.E. Kaszeta, C.S. Simmons, and C.R. Cole,
Multicomponent Mass Transport Model: A Model for Simulating
Migration of Radionuclides in Ground Water,
PNL-3179, July 1980.
- S.W. Ahlstrom, H.P. Forte, R.C. Arnett, C.R. Cole and R.J. Serne,
Multicomponent Mass Transport Model: Theory and Numerical
Implementation (Discrete-Parcel-Random-Walk Version),
BNWL-2127, May 1977.
NESC9853/01, included references:
- INTERA Environmental Consultants, Inc.:MMT: A Random-Walk One-Dimensional Multicomponent
Mass Transport Code.
ONWI-432 (April 1983)
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NESC9853/01
NOS2.5.1 664/650 with FORTRAN-77 compiler.[ top ]
14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS
MMT is a set of three programs which are run sequentially. The first program, MMT1D, utilizes flow and radionuclides input to generate the raw radionuclide release rate output in terms of the frequency at which parcels pass the specified release point and the calculated weights of these parcels. The second program, PLTCVT, is a post- processor which filters and smooths the MMT1D output to reduce the statistical fluctuation. PLTCVT uses a variable-window, moving- average filter algorithm to smooth the raw results. The smoothed output from PLTCVT consists of separate, smoothed output files for each nuclide under consideration. PLTCVT uses routines from the proprietary CalComp library to produce graphical output; these routines are not included. The third program, MERGE, merges the separate release files generated by PLTCVT into a single output file. This merged output file may be used directly by a biosphere transport or dose assessment code, such as PABLM (NESC Abstract 926), as radionuclide release rate input data.
MMT is a set of three programs which are run sequentially. The first program, MMT1D, utilizes flow and radionuclides input to generate the raw radionuclide release rate output in terms of the frequency at which parcels pass the specified release point and the calculated weights of these parcels. The second program, PLTCVT, is a post- processor which filters and smooths the MMT1D output to reduce the statistical fluctuation. PLTCVT uses a variable-window, moving- average filter algorithm to smooth the raw results. The smoothed output from PLTCVT consists of separate, smoothed output files for each nuclide under consideration. PLTCVT uses routines from the proprietary CalComp library to produce graphical output; these routines are not included. The third program, MERGE, merges the separate release files generated by PLTCVT into a single output file. This merged output file may be used directly by a biosphere transport or dose assessment code, such as PABLM (NESC Abstract 926), as radionuclide release rate input data.
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NESC9853/01
| File name | File description | Records |
|---|---|---|
| NESC9853_01.001 | Information file | 112 |
| NESC9853_01.002 | JCL and Control Information | 23 |
| NESC9853_01.003 | MMT1D FORTRAN source | 1608 |
| NESC9853_01.004 | PLTCVT FORTRAN source | 1604 |
| NESC9853_01.005 | MERGE FORTRAN source | 161 |
| NESC9853_01.006 | Nuclide data library | 284 |
| NESC9853_01.007 | MMTCVTN source aux. program for use by MMT | 23 |
| NESC9853_01.008 | MMT1D sample problem | 17 |
| NESC9853_01.009 | PLTCVT plotting parameter | 11 |
| NESC9853_01.010 | PLTCVT CM248 sample output | 66 |
| NESC9853_01.011 | PLTCVT PU244 sample output | 184 |
| NESC9853_01.012 | MERGE sample problem output | 201 |
| NESC9853_01.013 | PBLCVTN source aux. program | 33 |
| NESC9853_01.014 | MMT1D sample problem output | 99 |
Keywords: Monte Carlo method, convection, ground water, one-dimensional, radioactive waste storage, radionuclide migration, randomness, site selection.