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| Program name | Package id | Status | Status date |
|---|---|---|---|
| ACFA | NEA-1072/02 | Tested | 21-DEC-1987 |
Machines used:
| Package ID | Orig. computer | Test computer |
|---|---|---|
| NEA-1072/02 | IBM 3033 | IBM 3084 |
The ACFA code 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 multi- group neutron fluxes in one- or two-dimensional geometry. The neutron reaction types incorporated in the code are (n,n'), (n,2n), (n,gamma), (n,p), (n,alpha), (n,n'p), (n,n'alpha), (n,t), (n,3n), (n,He-3), (n,d), and (n,n'd) considering both reactions to the ground state and to isomeric states.
The code is flexibly dimensioned which means that the storage requirements are determined for the particular problem at execution time. The length of the decay chains constructed by the code only depends on the decay and cross section data given in the nuclear data libraries.
It is difficult to assign a typical running time since it depends on the number of nuclides, number of space points and number of irradiation and postirradiation times. The packaged sample problem uses 784 nuclides, 4 space points, 3 irradiation times and 9 postirradiation times. The running time for the GO step is 1 min 54 sec on the IBM-3081.
H.J. Bell, "ORIGEN - The ORNL Isotope Generation and Depletion Code", ORNL - 4628, Oak Ridge National Laboratory (1973).
The ACFA code was designed to run on the IBM 3033 and 3081 machines. The various calculational options require from four to eight direct access devices, depending on the problem. Furthermore, the standard input-output units are used.
NEA 1072/01: The test case included in this package ran on an IBM3084 computer in 740K bytes of main storage.
ACFA is operable on the IBM OS 360 with FORTRAN H Extended Compiler. The program consists of 34 subroutines on 3,707 source cards. Standard software may be used for the ACFA code. Any non-standard library routines which are used have been included in the code package. The required decay data library, activation cross section library, and photon yield library are also included in the code package.
Keywords: activation, biological hazard potential, coolants, decay spectra, neutron cross sections, radiation heat, structural beams, transmutation.
