1. NAME AND TITLE
AKTIV: An Evaluation of Activity, Afterheat and Biological Hazard Potential of Stainless Steel
Structures in Fusion Reactor Blankets.
Max-Planck-Institute for Plasma Physics, Federal Republic of Germany.
3. CODING LANGUAGE AND COMPUTER
Fortran IV; IBM 360/370.
4. NATURE OF PROBLEM SOLVED
AKTIV calculates the activity, afterheat, and biological hazard potential of arbitrary materials in
a fusion reactor blanket environment. It can be used in any case where activating fluxes (neutrons,
gamma-rays, protons, etc.), corresponding cross-sections, and all initial conditions are known. The
latter comprise, primarily, the initial concentrations of the chemical elements and their isotopic
composition present in the blanket.
5. METHOD OF SOLUTION
The data concerning transmutations, activity, afterheat or decay power, and the biological hazard
potential (BHP) are calculated by AKTIV as a function of time for each space interval and each zone
comprising a certain number of intervals which are specified by the program input. In doing this, the
time dependence can be treated in three different modes corresponding to the operation sequence of
burn period: the reactor is operating, radionuclides are being produced and decay;
shutdown period: the reactor is out of operation, all neutron fluxes are zero, the radionuclides decay;
periodic operation: the reactor is periodically started and shut down, the periods being assumed
to be constant.
6. RESTRICTIONS OR LIMITATIONS
The shortest half-life involved should not be less than 0.1 second. Since the program was designed
to operate on the IBM 360/370 computers, a number of variables had to be defined in double precision.
This assures a calculational accuracy of better than 1% if the time variation of the activity is followed
up to 1010 seconds.
7. TYPICAL RUNNING TIME
If AKTIV is applied to large problems, it requires a significant amount of computer time. This is
mainly dependent upon the number of intervals and the number of time phases to be calculated.
8. COMPUTER HARDWARE REQUIREMENTS
AKTIV was designed to operate on the IBM 360/370.
9. COMPUTER SOFTWARE REQUIREMENTS
A Fortran IV compiler is required.
H.-J. Odenthal, W. Danner, and H. Gorenflo, "AKTIV, A Computer Program for Evaluating the
Activity, Afterheat, and Biological Hazard Potential of Stainless Steel Structures in Fusion Reactor
Blankets," IPP 4/154 (May 1977).
11. CONTENTS OF CODE PACKAGE
Included are the referenced document and one (1.2MB) DOS diskette which contains the source
codes and sample problem input and output.
12. DATE OF ABSTRACT
KEYWORDS: CTR; ACTIVATION; RADIONUCLIDES; ISOTOPE INVENTORY