ESTS0308 TRITMOD.

1. NAME OR DESIGNATION OF PROGRAM:  TRITMOD.

3. DESCRIPTION OF PROBLEM OR FUNCTION

TRITMOD is a steady-state advection model of tritium dispersion and cycling in underlying vegetation and soil from an atmospheric point source. Radial geometry is assumed. Tritium is assumed to be released to the atmosphere in both gaseous tritiated hydrogen and tritiated water vapor form. The PC version contains a preprocessor, TRITFST, which allows the user to view the parameters used as model input data and  to change any one of them, if desired.

4. METHOD OF SOLUTION

The steady-state dispersion equation is solved  iteratively by integration from the furthest distance from the source back to the source.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Steady-state
conditions and radial geometry are assumed.

6. TYPICAL RUNNING TIME

Running time is dependent on the radius of interest. The sample problem required 30 seconds on an IBM PC/AT using the compiled BASIC TRITMOD program; 4.5 minutes are required when run from the TRITMOD BASIC source.

7. UNUSUAL FEATURES OF THE PROGRAM

TRITMOD takes into account the deposition of HT and the conversion of HT to HTO.

8. RELATED AND AUXILIARY PROGRAMS:

10. REFERENCES

- C.E. Murphy, Jr. and M.M. Pendergast:
  Environmental Transport and Cycling of Tritium in the Vicinity of
  Atmospheric Releases
  IAEA Symposium on Behavior of Tritium in the Environment
  San Francisco, 1978, DP-MS-78-25, IAEA-SM-232/83.
- System/360 Continuous System Modeling Program User's Manual
  International Business Machines Corporation, White Plains, N.Y.
- TRITMOD, NESC No. 814.PC, TRITMOD IBM PC Version Flexible Disk
  Cartridge Description
  NESC 91-11 (November 6, 1990).

- C.E. Murphy et al.:
  Environmental Transport and Cycling of Tritium in the Vicinity
  of Atmospheric Releases
  IAEA/NEA International Symposium on the Behavior of Tritium in the
  Environment, San Francisco, October 16-20, 1978
  DP-MS-78-25 (IAEA-SM-232/80) 1978
- Sample Problem Output

11. MACHINE REQUIREMENTS:

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  DOS 3.1 (IBM PC).

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHOR

C.E. Murphy, Jr.
Environmental Transport Division
Savannah River Laboratory
E.I. duPont de Nemours and Company, Inc.
Aiken, South Carolina 29801, U. S. A.

source program   mag tapeTRITFST.BAS TRITFST preprocessor source    SRCTP
source program   mag tapeTRITMD2.BAS TRITMOD BASIC source           SRCTP
source program   mag tapeTRITFST.EXE TRITFST executable             SRCTP
source program   mag tapeTRITMD2.BAS TRITMOD executable             SRCTP
test-case data   mag tapeTRITNIN.86 TRITFST default input parametersDATTP
test-case data   mag tapeTRITIN.86 Headings used by TRITFST         DATTP
miscellaneous    mag tapeTRITN TRITFST output & sample problem inputMISTP
test-case output mag tapeTRITOUT TRITMOD sample problem output      OUTTP
test-case data   mag tapeAUTOEXEC.BAT Batch file to execute TRITMOD DATTP
miscellaneous    mag tapeTRITMOD.DOC Information file               MISTP
prog. note               Sample problem output                      NOTPT
report                   DP-MS-78-25 (1978)                         REPPT