1. NAME AND TITLE
FERRET: Least-Squares Solution to Nuclear Data and Reactor Physics Problems.
Hanford Engineering Development Laboratory, Richland, Washington.
3. CODING LANGUAGE AND COMPUTER
Fortran IV; UNIVAC.
4. NATURE OF PROBLEM SOLVED
FERRET is a tool for data analysis. It provides a way to combine related measurements and
calculations in a consistent evaluation.
5. METHOD OF SOLUTION
FERRET is a very general least-squares code which is oriented towards problems frequently
encountered in nuclear data and reactor physics. It emphasizes the proper treatment of uncertainties
and correlations and provides quantitative uncertainty estimates.
6. RESTRICTIONS OR LIMITATIONS
This version of FERRET can simultaneously adjust 20 separate multigroup cross sections and
neutron fluxes in an 80 group structure. It is also possible to adjust an 80 point representation of a
cross section sigma(E) by applying an indefinite number of microscopic and integral cross section
measurements. Any one microscopic data set could contain a maximum of 35 values; the code could
be redimensioned to extend this size. This Univac version utilizes a PARAMETER statement which
provides very flexible dimensioning.
7. TYPICAL RUNNING TIME
Execution times are extremely problem dependent. FERRET usually runs in a few minutes or less
on the Univac 1100/44 computer.
8. COMPUTER HARDWARE REQUIREMENTS
FERRET was originally written for a CDC Cyber-74 computer. This version is operable on the
Univac computers. It uses four disk or drum units as scratch files. Two of these can be replaced by
direct core access for additional flexibility.
9. COMPUTER SOFTWARE REQUIREMENTS
A Fortran IV compiler is required.
F. Schmittroth, "FERRET Data Analysis Code," HEDL TME 79-40 (September 1979).
11. CONTENTS OF CODE PACKAGE
Included are the referenced document and one (1.2MB) DOS diskette which contains the source
code, sample problem and output, flux spectrum, and dosimeter cross section input.
12. DATE OF ABSTRACT
KEYWORDS: COVARIANCE DATA PROCESSING; DATA PROCESSING, SPECTRA; GAMMA-RAY SPECTRUM ANALYSIS; UNCERTAINTY ANALYSIS; UNFOLDING