PSR-0145 FERRET.

1. NAME OR DESIGNATION OF PROGRAM:  FERRET.

3. DESCRIPTION OF PROBLEM OR FUNCTION

The FERRET code is a tool for data analysis. It provides a way to combine related measurements and calculations in a consistent evaluation. Basically a very general least-squares code, it is oriented towards problems frequently encountered in nuclear data evaluations and reactor physics. It is especially suited (but not restricted) to problems that involve the  evaluation or adjustment of a very large number of parameters that are poorly determined by the available data. More specifically, it is adapted to the evaluation of physical quantities known to be positive, such as nuclear cross sections and neutron fluxes. A strong emphasis is placed on the proper utilization of important correlations and in providing quantitative uncertainty estimates.

4. METHOD OF SOLUTION:

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

With standard dimensioning, 20 separate multigroup cross sections and neutron fluxes in a 80 group structure may be adjusted. Any one microscopic  data set could contain a maximum of 35 values.

6. TYPICAL RUNNING TIME

Execution times are extremely problem dependent. For realistic problems, execution times are usually a few minutes or less on the UNIVAC 1100/44.
NEA-DB executed the test case included in the package on UNIVAC 1100 in 0.7 CPU seconds.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS:

10. REFERENCES

- F. Schmittroth:
  A Method for Data Evaluation with Log-Normal Distributions
  HEDL-SA-1742
- F. Schmittroth:
  Generalized Least-Squares for Data Analysis
  HEDL-TME 77-51 (March 1978)
- F. Schmittroth:
Varied Applications of a New Maximum-Likelihodd Code with Complete    Covariance Capability
  in: A Review of the Theory and Application of Sensitivity and
      Uncertainty Analysis
      edited by C.R. Weisbin et al.
      ORNL/RSIC-42, Proceedings of a Seminar Workshop, Oak Ridge,
      TN (August 22-24, 1978)

- F. Schmittroth:
  FERRET Data Analysis Code.  HEDL TME 79-40  (September 1979)

11. MACHINE REQUIREMENTS

The standard dimensioning requires about 34k decimal words on a UNIVAC 1100/44.
The test case included in the package was executed on UNIVAC 1100 in 70,175 (decimal) words of main storage.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
UNIVAC 1100 Time-sharing EXEC LEV. 39R2A6013.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHOR

Contributed by: Radiation Safety Information Computational Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.
Developed by:   Hanford Engineering Development Laboratory,
                Richland, Washington, USA

File name	File description	Records
PSR0145_01.003	FERRET INFORMATION FILE	32
PSR0145_01.004	JCL	39
PSR0145_01.005	FERRET SOURCE PROGRAM	2757
PSR0145_01.006	FERRET TEST CASE INPUT DATA	59
PSR0145_01.007	INPUT FLUX SPECTRUM & DOSIMETER X-SEC	222
PSR0145_01.008	FERRET TEST CASE PRINTED OUTPUT	395