1. NAME AND TITLE
ACFA: A Versatile Activation Code for Coolant and Structural Materials.
REDUCE: Generates reduced decay data library.
Kernforschungsanlage Jülich GmbH, Federal Republic of Germany.
3. CODING LANGUAGE AND COMPUTER
Fortran IV; IBM 3033.
4. NATURE OF PROBLEM SOLVED
ACFA calculates the neutron-induced activation, afterheat, biological hazard potential, transmutation and gamma-ray spectra in a nuclear system. The quantities of interest may be calculated by interval and/or by zone of the system considered. To calculate the transmutation coefficients for the neutron-induced reactions the code uses multigroup activation cross sections and space-dependent multigroup neutron fluxes in one- or two-dimensional geometry.
5. METHOD OF SOLUTION
ACFA uses the matrix exponential method and the Bateman solution to solve a large system of coupled linear first-order ordinary differential equations with constant coefficients. The numerical methods for solving the equations are taken from ORIGEN.
6. RESTRICTIONS OR LIMITATIONS
ACFA is flexibly dimensioned; the storage requirements are determined for the particular problem at execution time. The length of the decay chains constructed by the code only depends upon the decay and cross section data given on the nuclear data libraries.
7. TYPICAL RUNNING TIME
The sample problem ran in 1.25 cpu min.
8. COMPUTER HARDWARE REQUIREMENTS
ACFA runs on the IBM 3033 computer. From four to eight direct access devices are required depending upon the problem. Standard input-output units are used; it requires < 4000 I/O.
9. COMPUTER SOFTWARE REQUIREMENTS
ACFA is operable on the IBM OS 360 with Fortran H Extended Enhanced Compiler. Standard software may be used. It uses 744 K in the GO step.
H. Brockmann and U. Ohlig, "ACFA - A Versatile Activation Code for Coolant and Structural Materials," ISSN 0366-0885 (September 1983).
11. CONTENTS OF CODE PACKAGE
Included are the referenced document and 1 DS/HD (1.2 MB) diskette which contains the source code and sample problem input, and output from the sample problem.
12. DATE OF ABSTRACT
KEYWORDS: ACTIVATION; GAMMA-RAY