1. NAME AND TITLE
TACT-III: Calculation of the Transport of Radioactivity from a Reactor Core.
AUXILIARY ROUTINE
Nuclide data pre-processor to convert from BCD to binary format.
2. CONTRIBUTORS
Oak Ridge National Laboratory, Oak Ridge, Tennessee.
U. S. Nuclear Regulatory Commission, Washington, D. C.
3. CODING LANGUAGE AND COMPUTER
Fortran IV; IBM 370/3033.
4. NATURE OF PROBLEM SOLVED
TACT-III (an acronym for ``Transport of ACTivity") is one of a series of codes developed for the purpose of evaluating the mitigating effects of engineered safety features. It has been applied to analyses of light water reactors with a data base consisting of iodines and noble gases.
TACT-III is a computational vehicle for representing a mathematical model by
a system of ordinary differential equations and calculating a numerical solution
of the differential equations. It is not a model, itself, nor is it tied to a
fixed set of source terms or other parameter values.
5. METHOD OF SOLUTION
TACT-III simulates the movement of radioactivity released from a reactor core
as it migrates through user-defined regions (nodes) of the containment, is
immobilized by filters and sprays, and leaks to the outside environment. The
user's input data specify a dynamic compartment model which is represented by
systems of ordinary differential equations with constant coefficients. The
equations are solved explicitly by matrix transformation methods. TACT-III
carries out the integration of these systems of equations over a succession of
contiguous time intervals following reactor shutdown, with the interval
boundaries corresponding to transitions of system parameter values. Outputs are
shown for the end of each time interval and include the level of radioactivity
in each node of the containment and in the environment, broken down as iodines,
noble gases, and solids, and the radiation dose to reference individuals at the
exclusion radius, the boundary of the low population zone, and in the control
room. Values of input parameters are also printed and a summary is available at
the user's option.
6. RESTRICTIONS OR LIMITATIONS
Data are required from two sources: (1) input data from the user which varies
from one run to another according to the analysis to be made and (2) a permanent
data base which normally does not change from one run to another but which can
be regenerated to include new data. System parameter values must be constant
within each time interval.
7. TYPICAL RUNNING TIME
The sample problems tested required < 10 seconds each.
8. COMPUTER HARDWARE REQUIREMENTS
TACT-III is operable on the IBM 370/3033 computers. A typical case requires
840 K bytes of core storage.
9. COMPUTER SOFTWARE REQUIREMENTS
A Fortran Q (H extended enhanced) compiler is required. TACT-III uses the IBM
OS/MVS JES2 system.
10. REFERENCE
G. G. Killough, C. L. Begovich, A. L. Sjoreen, L. W. Bell, "A Guide for the
TACT III Computer Code," NUREG/CR-3287, ORNL/TM-8763 (May 1983).
11. CONTENTS OF CODE PACKAGE
Included are the referenced document and one (1.2MB) DOS diskette which
contains the source code and sample problem input and output.
12. DATE OF ABSTRACT
January 1984.
KEYWORDS: NUCLIDE TRANSPORT; FISSION PRODUCTS; RADIOACTIVITY RELEASE; REACTOR ACCIDENT