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.