CCC-0621 PAGAN 1.1.

1. NAME OR DESIGNATION OF PROGRAM:  PAGAN 1.1.

3. DESCRIPTION OF PROGRAM OR FUNCTION

The PAGAN code system is a part of the performance assessment methodology developed for use by the U.S. Nuclear Regulatory Commission in evaluating license applications for low-level waste disposal facilities. In this methodology, PAGAN is used as one candidate approach for analysis of the ground-water pathway. PAGAN, Version 1.1 has the capability to model the source term, vadose-zone transport, and aquifer transport  of radionuclides from a waste disposal unit. It combines the two codes SURFACE and DISPERSE which are used as semi-analytical solutions to the convective-dispersion equation. This system uses menu driven input/out for implementing a simple ground-water transport analysis and incorporates statistical uncertainty functions for handling data uncertainties.
The output from PAGAN includes a time- and location-dependent radionuclide concentration at a well in the aquifer, or time- and location-dependent radionuclide flux into a surface-water body.

4. METHOD OF SOLUTION

PAGAN uses a simple modeling approach to which  the convective-dispersion equation is applied. The model for releases from a disposal unit is based on a cascade mixing cells including leach mechanisms that can be used to analyze either surface contaminated wastes or diffusion controlled releases.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The PAGAN code is not intended for complex analyses of ground-water transport.

6. TYPICAL RUNNING TIME:

Execution times of the test runs performed by the NEA-DB for the sample problems on a PC/80486 (66MHz) were:
   Sample problem      Run time (approximate)
   EX2A                 6 seconds
   EX2B                 6 seconds
   EX3                 33 seconds
   EX4A                 7 seconds
   EX4B                 7 seconds

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS:

10. REFERENCES

- M.W. Kozak, M.S.Y. Chu, P.A. Mattingly, J.D. Johnson, and J.T.
  McCord,
  Background Information for the Development of a Low-Level Waste
  Performance Assessment Methodology
  NUREG/CR-5453, Vol. 5, SAND90-0375 WL (June 1990).

- M.S.Y. Chu:
  A Self-Teaching Curriculum for the NRC/SNL Low-Level Waste
  Performance Assessment Methodology
  NUREG/CR-5539, SAND90-0585 (December 1990).
- M.W. Kozak:
  A Comparison Between Simple and Detailed Methods for Analyzing
  Releases of Radionuclides to Ground Water from Low-Level Waste
  Facilities
  (February 1991).

11. MACHINE REQUIREMENTS

An IBM PC or compatible is required. A color  monitor/adapter, 300K available conventional RAM, a math coprocessor, and hard disk are recommended.

The program was installed by NEA-DB on a DELL 466/L PC/80486 (66MHz).

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

The system runs under DOS 3.31 or higher. The Fortran source files for the statistics driver are included; however the SUNS (Sensitivity and Uncertainty Analysis Shell) portion of the source is not distributed. MS Fortran 5.1 compiler was used to create the executable included in the package.

NEA-DB performed the test runs under MS-DOS 6.2. The source code was compiled using the Microsoft FORTRAN compiler Version 5.1

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:   Sandia National Laboratories
                Albuquerque, New Mexico, USA

File name	File description	Records
CCC0621_01.001	Information file	187
CCC0621_01.002	Author's information file	44
CCC0621_01.003	Statistics Driver subprogram file	529
CCC0621_01.004	Statistics Driver subprogram file	375
CCC0621_01.005	Statistics Driver subprogram file	1416
CCC0621_01.006	Statistics Driver include file	42
CCC0621_01.007	Statistics Driver main program file	715
CCC0621_01.008	To compile and link the Statistics Driver	7
CCC0621_01.009	To run the PAGAN code	8
CCC0621_01.010	PAGAN executable	0
CCC0621_01.011	PAGAN Executive Routine module executable	0
CCC0621_01.012	PAGAN Input module executable	0
CCC0621_01.013	PAGAN Statistics Driver executable	0
CCC0621_01.014	PAGAN Post Processor module executable	0
CCC0621_01.015	Help file used within PAGAN	0
CCC0621_01.016	Initialization file	2
CCC0621_01.017	Called from PAGAN.BAT for SUNSHELL	3
CCC0621_01.018	Nuclide library file	85
CCC0621_01.019	DOS command line utility	0
CCC0621_01.020	Problem template	1029
CCC0621_01.021	Sample input #2A	1018
CCC0621_01.022	Sample input #2B	1018
CCC0621_01.023	Sample input #3	1022
CCC0621_01.024	Sample input #4A	1018
CCC0621_01.025	Sample input #4B	1018
CCC0621_01.026	Sample output #2A	58
CCC0621_01.027	Sample output #2B	58
CCC0621_01.028	Sample output #3	219
CCC0621_01.029	Sample output #4A	55
CCC0621_01.030	Sample output #4B	55
CCC0621_01.031	Block headers for PAGAN output - sample #2A	17
CCC0621_01.032	Block headers for PAGAN output - sample #2B	17
CCC0621_01.033	Block headers for PAGAN output - sample #3	21
CCC0621_01.034	Block headers for PAGAN output - sample #4A	17
CCC0621_01.035	Block headers for PAGAN output - sample #4B	17
CCC0621_01.036	Used for PAGAN output - sample #2A	0
CCC0621_01.037	Used for PAGAN output - sample #2B	0
CCC0621_01.038	Used for PAGAN output - sample #3	0
CCC0621_01.039	Used for PAGAN output - sample #4A	0
CCC0621_01.040	Used for PAGAN output - sample #4B	0
CCC0621_01.041	DOS file-names	40