last modified: 09-FEB-1988 | catalog | categories | new | search |

NESC9853 MMT.

MMT, 1-D Radionuclide Groundwater Transport

top ]
1. NAME OR DESIGNATION OF PROGRAM:  MMT.
top ]
2. COMPUTERS
To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.
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
top ]
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.
top ]
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.
top ]
5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:
top ]
6. TYPICAL RUNNING TIME:
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 ]
7. UNUSUAL FEATURES OF THE PROGRAM:
top ]
8. RELATED AND AUXILIARY PROGRAMS:
top ]
9. STATUS
Package ID Status date Status
NESC9853/01 09-FEB-1988 Tested at NEADB
top ]
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.
NESC9853/01, included references:
- INTERA Environmental Consultants, Inc.:
  MMT: A Random-Walk One-Dimensional Multicomponent
  Mass Transport Code.
  ONWI-432  (April 1983)
top ]
11. MACHINE REQUIREMENTS:  77K words.
NESC9853/01
154,000 (octal) words (CDC CYBER 740).
top ]
12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC9853/01 FORTRAN-77
top ]
13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
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.
top ]
15. NAME AND ESTABLISHMENT OF AUTHORS

          S.W. Ahlstrom, J.F. Washburn et al.,
          Pacific Nowthwest Laboratory

          J. Golis
          Battelle Project Management Division
          505 King Avenue, Columbus, Ohio 43201
top ]
16. MATERIAL AVAILABLE
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
top ]
17. CATEGORIES
  • R. Environmental and Earth Sciences

Keywords: Monte Carlo method, convection, ground water, one-dimensional, radioactive waste storage, radionuclide migration, randomness, site selection.