FICS--A PROGRAM TO COMPUTE FEW-GROUP CONSTANTS WITHIN THE KARE DIFFUSION THEORY SYSTEM. REVISION III

Technical Report · Fri Feb 28 04:00:00 EST 1964

OSTI ID:4062330

Goodman, D E

The computer program FICS computes diffusion constants and macroscopic cross sections for slowing down, absorption, nu -fission, and total removal in two, three, or four energy groups for each compositional region in the reactor model. The one-group thermal constants are provided by a variational technique which computes an approximate Wigner-Wilkins flux spectrum as a linear combination of two trial spectra. The thermal group constants are determined by averaging lethargy-dependent microscopic cross sections and diffusion constants over the composite spectrum. The thermal constants are temperature-dependent, with region temperatures from 68 to 600 deg F permitied. In the fast energy range (10 Mev to 0.625 ev) the program computes temperature-independent constants in one, two or three energy groups. These are determined from stored microscopic cross sections which were obtained by curve fitting to MUFT parameters over a wide range of metal-water ratios. Optional calculations, some of which modify one group constants for special purposes, while others prepare and transmit data to other segments, are provided. (auth)

• Research Organization: Knolls Atomic Power Lab., Schenectady, N.Y.
• DOE Contract Number: W-31-109-ENG-52
• NSA Number: NSA-18-016893
• OSTI ID: 4062330
• Report Number(s): KAPL-M-6119
• Country of Publication: United States
• Language: English

Related Subjects

ABSORPTION
COMPUTERS
CROSS SECTIONS
DIFFUSION
F-CODES
FISSION
GROUP THEORY
HYDROGEN
MATHEMATICS
METALS
NEUTRON FLUX
NEUTRONS
NUMERICALS
PHYSICS
PROGRAMMING
REACTORS
SLOWDOWN
SPECTRA
TEMPERATURE
THERMAL NEUTRONS
VARIATIONAL METHOD
WATER
WIGNER-WILKINS MODEL