CCC-0634 DUST-BNL.

1. NAME OR DESIGNATION OF PROGRAM:  DUST-BNL.

3. DESCRIPTION OF PROGRAM OR FUNCTION

DUST solves for release and transport of contaminants from containerized wastes. Each container  may have unique properties (i.e. time to failure or localized failure, e.g. pitting) and each waste form may have unique release properties. Release from the waste form is limited by one of four physical or chemical restraints: solubility, diffusion, dissolution, and surface wash-off with partitioning. The release from the waste form acts as a source for transport in the advection/dispersion equation. Transport is modeled in one-dimension through the groundwater pathway from subsurface disposal. RNUCL.DAT, data base of half-lives, solubility limits, and atomic mass for selected radionuclides, is included in this package.

4. METHOD OF SOLUTION

The advection/dispersion transport equation with spatially varying sources (waste forms) is solved using the method of finite-differences. Advancement in time is achieved using  the fully implicit backward Euler scheme. An option exists which permits an analytical solution to the advection equation with spatially varying sources. This procedure is an extension of the mixing-cell cascade models. Radioactive decay and sorption processes are included in either model. Container performance is calculated through empirical correlations and user-supplied input data. Waste form release characteristics are simulated with geometry-dependent (rectangular or cylindrical waste forms) analytical solutions to the diffusion equation. Dissolution is modeled through an input value specifying yearly fractional release rate and rinse release with partitioning is simulated using user-supplied values. In all cases,  checks are made to prevent solubility limits from being exceeded.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

One-dimensional.
Maximum problem size is 1000 time steps and 500 computational points. These can be readjusted by redimensioning the code.
Maximum number of waste containers and waste forms is 300.
Maximum number of materials is 10 (i.e. number of regions with different transport properties).
Water flow is treated through tabular input. Flow rates must be estimated by other computer codes.
Simulates only a single-species.
Changes in chemistry over time are not modeled.

6. TYPICAL RUNNING TIME

For a problem with 100 computational points and 100 time steps the run time is less than 5 seconds on a 486/50 IBM PC compatible.

NEA-DB executed the test cases included in this package on a Pentium PC/75MHz. The following execution times were found: CASE8-4: 12 sec; CASE8-6: 5 sec; FDMEX: 6 sec; MCMCEX: 3 sec.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS:

10. REFERENCES

T.M. Sullivan:
Selection of Models to Calculate the LLW Source Term
NUREG/CR-5773, BNL-NUREG-52295 (October 1991)

- T.M. Sullivan:
  DUST - Disposal Unit Source Term: Data Input Guide
  NUREG/CR-6041, BNL-NUREG-52375 (May 1993)

11. MACHINE REQUIREMENTS

An IBM PC or compatible with a minimum of a
386 processor. 500K of RAM of available conventional RAM is required for execution. Approximately 4 MB of disk space is required for the  entire code package.

NEA-DB installed the program on a Brett Pentium 75MHz with 16 MB of RAM

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

The GRAFXT utility was compiled using the Lahey Fortran v5.0 graphics library.  You will need the compiler if you recompile the source for GRAFXT. The included executables are bound with the Phar Lap DOS extender and do not require the Lahey Fortran package to execute.

NEA-DB ran the program under Windows 95 - DOS 7.0. The  source files were compiled with the Lahey Fortran compiler version 5.2 and with Lahey Fortran version 5.0 for GRAFXT.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

Contributed by:
                Radiation Safety Information Computational Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.

Developed by:
                Brookhaven National Laboratory
                Upton, New York, USA

File name	File description	Records
CCC0634_01.001	Information file	233
CCC0634_01.002	DUST Source code	3325
CCC0634_01.003	DUST Executable file	0
CCC0634_01.004	Graphics source code	1894
CCC0634_01.005	Graphics executable file	0
CCC0634_01.006	Pre-processor source code	4877
CCC0634_01.007	Pre-processor executable file	0
CCC0634_01.008	IOSWTCH source file	92
CCC0634_01.009	IOSWTCH executable file	0
CCC0634_01.010	Data on radionuclide names	290
CCC0634_01.011	Mixing cell cascade test problem	70
CCC0634_01.012	Output file CASE8-4	1223
CCC0634_01.013	CONCENTRATION TRACE FILE FOR CASE8-4.INP	87
CCC0634_01.014	Flux trace file for CASE8-4.INP	87
CCC0634_01.015	Finite difference test problem	88
CCC0634_01.016	Output file for CASE8-6.INP	2588
CCC0634_01.017	Concentration trace file for CASE8-6.INP	87
CCC0634_01.018	Flux trace file for CASE8-6.INP	87
CCC0634_01.019	FD Model example	97
CCC0634_01.020	Output file from FDMEX.INP	1450
CCC0634_01.021	Concentration trace file from FDMEX.INP	27
CCC0634_01.022	Flux trace file from FDMEX.INP	27
CCC0634_01.023	Concentrations at each location file (FDMEX)	375
CCC0634_01.024	Wateform release data file (FDMEX)	1063
CCC0634_01.025	MCMC model example	66
CCC0634_01.026	MCMC model example output	576
CCC0634_01.027	Concentration trace file for MCMCEX.INP	32
CCC0634_01.028	Flux trace file for MCMCEX.INP	32
CCC0634_01.029	Block file for CASE8-6 for use by DUSTIN	808
CCC0634_01.030	Block file for CASE8-4 for use by DUSTIN	807
CCC0634_01.031	DOS file-names	30