1. NAME AND TITLE
GABAS: A Code System for Generating Composite Time-Dependent Fission Produce Spectra.
ISPEC: Reads fission product spectral data and writes a binary file for input to GABAS.
Instrumentation Research Technology, San Diego, California.
Sandia National Laboratories, Albuquerque, New Mexico.
3. CODING LANGUAGE AND COMPUTER
Fortran IV; UNIVAC 1100/81.
4. NATURE OF PROBLEM SOLVED
GABAS calculates time-dependent beta- and/or gamma-ray spectra from decaying fission products.
5. METHOD OF SOLUTION
GABAS calculates composite fission-product beta and/or gamma-ray spectra based on the technique
used by England, et al., in conjunction with the CINDER family of fission product codes. Multigroup
beta and gamma-ray spectra for individual nuclides are folded with their corresponding time-dependent
activities (usually generated by a fission product inventory code) to produce a composite time-dependent fission product spectrum. GABAS was intended to interface with the fission product
inventory code RIBD-IRT; however, other codes like ORIGEN or CINDER could be utilized with
appropriate modifications to their output format.
6. RESTRICTIONS OR LIMITATIONS
7. TYPICAL RUNNING TIME
For 34 time steps and 180 fission products, the approximate CPU time was 10 seconds.
8. COMPUTER HARDWARE REQUIREMENTS
GABAS is operable on the UNIVAC 1100/81 computer. Two mass storage files, either tapes or
discs, and a printer are needed.
9. COMPUTER SOFTWARE REQUIREMENTS
A Fortran IV compiler is required.
a. Included in documentation:
D. D. Thayer and N. A. Lurie, "A User's Manual for the GABAS Spectrum Computer Code," IRT
6406-004, January 1982.
b. Background information:
M. G. Stamatelatos and T. R. England, "FPDCYS and FPSPEC: Computer Programs for Calculating Fission-Product Beta and Gamma Multigroup Spectra from ENDF/B-IV Data," LA-NUREG-6818-MS (May 1977).
D. D. Thayer and N. A. Lurie, "A User's Manual for Computer Code RIBD/IRT," IRT 6406-003, SAND 82-7013, NUREG/CR-2393 (January 1982).
T. R. England and M. G. Stamatelatos, "Multigroup Beta and Gamma Spectra of Individual
ENDF/B-IV Fission Product Nuclides," LA-NUREG-6622-MS (December 1976).
11. CONTENTS OF CODE PACKAGE
Included are the referenced document (10.a) and one (1.2MB) DOS diskette which contains the
source program and sample problem input.
12. DATE OF ABSTRACT
February 1982; August 1984.
KEYWORDS: DATA PROCESSING, SPECTRA; GAMMA-RAY SPECTRUM ANALYSIS; RADIATION SOURCE GENERATOR