NESC1113 TACT-5.

1. NAME OR DESIGNATION OF PROGRAM:  TACT-5.

3. DESCRIPTION OF PROGRAM OR FUNCTION

TACT5 (Transport of ACTivity) simulates the movement of radioactivity hypothetically released from a reactor core as it migrates through user-defined regions (nodes) of the containment, is immobilized by filters and sprays, and is released to the outside environment. Doses are reported at two predefined locations and one user-defined location. TACT5 has the capability to model radionuclide removal processes such as filtration and containment sprays, and can treat both isotopic groups (i.e., halogens, noble gases, sodium isotopes, solids, or plutonium isotopes) and the various forms of the isotopic groups (i.e., elemental, organic, particulate) separately. Radiation doses  to reference individuals at the exclusion radius, the boundary of the low population zone, and, if selected, at a third receptor point, are generated. The code can be used to calculate impacts on offsite dose and control room dose as a result of varying plant parameters, such as containment spray effectiveness, filter efficiencies, ice condenser performance, or any other parameter modeled by the code.
Three interactive preprocessors written in the BASIC programming language are included to assist the user in compiling a nuclide input data file and a plant model data file.

4. METHOD OF SOLUTION

The plant model data specifies a dynamic compartment model, which is represented by systems of ordinary differential equations with constant coefficients. The equations, which represent the transport of mass between various compartments,  are solved explicity by matrix transformation methods. This results  in a calculation of the amount of a radionuclide (in curies) present in each node and the environment at the end of each time step. The number of curies of each nuclide at the dose evaluation point is multiplied by a dose conversion factor for the specific nuclide and  for the organs of interest (and the breathing rate, if appropriate), to yield organ dose in REM for each time step. These doses are assumed to obtain a dose contribution for the time step and over all time steps to obtain the final calculated dose to each organ of interest for the model.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

6. TYPICAL RUNNING TIME

NESC executed each sample problem in less than 30 seconds on an IBM PS/2 Model 70.

The test cases included in this package have been run by NEA-DB on an IBM PC/AT compatible computer. Execution times were: 30 seconds (case 1); 1 minute 30 seconds (case 2).

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS

TACT5 is a successor to TACT3, which was designed to run on a minicomputer, and earlier mainframe releases of TACT, which were developed by the Accident Evaluation Branch of the NRC. The original IBM PC version of TACT5 was written  by Larry Bell of the NRC.

10. REFERENCES

- G.G. Killough, C.L. Begovich, A.L. Sjoreen, and W. Bell:
  A Guide for the TACT III Computer Code
  NUREG/CR-3287 (ORNL/TM-8763), (May 1983).

- D.B. West and H.E. Gilpin:
  User's Guide for the TACT5 Computer Code
  NUREG/CR-5106 (SAIC-88/3023), (June 1988).
- L. Eyberger:
  TACT5 Flexible Disk Cartridge Description
  NESC Note 89-48 (April 17, 1989).

11. MACHINE REQUIREMENTS

TACT5 requires an IBM PC, PC-XT or -AT or compatible computer with a minimum of 256 Kbytes of RAM, a flexible  disk drive, and a fixed disk with a minimum of 500 Kbytes storage. A math coprocessor is highly recommended but not required.

Main storage requirements on an IBM PC/AT are about 162 kBytes.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  DOS 4.0.

The program ran under MSDOS version 3.30. The compilers RM/FORTRAN version 2.42 and GWBASIC were used.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

TACT5
calls the Ryan-McFarland routines GETDAT and GETTIM to obtain the current date and time, respectively. Suitable alternatives are required if another compiler is used.

15. NAME AND ESTABLISHMENT OF AUTHORS

          H.E. Gilpin
          Science Applications International Corporation
      and
          L. Brown
          U.S. Nuclear Regulatory Commission

File name	File description	Records
NESC1113_01.001	Information file	99
NESC1113_01.002	Sample problem 1	29
NESC1113_01.003	Sample problem 2	74
NESC1113_01.004	Nuclide data file (ICRP 2 data)	736
NESC1113_01.005	Nuclide data file (ICRP 30 data)	736
NESC1113_01.006	Nuclide data file for sample problems	124
NESC1113_01.007	TACT5 installation instructions	28
NESC1113_01.008	TACT5 FORTRAN 77 source	565
NESC1113_01.009	Batch file to execute TACT5	1
NESC1113_01.010	TACT5 FORTRAN 77 source	1514
NESC1113_01.011	Preprocessor BASIC source	554
NESC1113_01.012	Preprocessor BASIC source	75
NESC1113_01.013	Preprocessor BASIC source	352
NESC1113_01.014	DOS file-names	11