DLC-0091 ZZ-COVFILS.

1. NAME OR DESIGNATION OF PROGRAM:  ZZ-COVFILS-2.I.

3. DESCRIPTION OF PROGRAM OR FUNCTION


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  FORMAT: ENDB/F

  NUMBER OF GROUPS: 30-Group Covariance Library

  NUCLIDES: H-1, B-10, C, O-16, Cr, Fe, Ni, Cu, Pb,

  ORIGIN: ENDF/B-V

  WEIGHTING SPECTRUM:

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COVFILS is a 30-Group Covariance Library. It contains neutron cross  sections, and their uncertainties and correlation in multigroup form. These data can be used, in conjunction with sensitivity information, to estimate the data-related uncertainty in calculated integral quantities such as radiation-damage or heating.

4. METHOD OF SOLUTION

COVFILS was obtained by processing evaluations  from ENDF/B-V with ERRORR module of the NJOY nuclear data processing system (LA-9303-M, Vols. 1).The group structure is the Los Alamos 30-group structure which is listed in "File 1" of each multigroup data set in the library.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

6. TYPICAL RUNNING TIME:

A few seconds were required to execute the auxiliary retrieval program COVARD on a PC-DELL Optiplex GXM 5100 with base memory 640 Kbyte and extended memory of 32 MByte, equipped with a Pentium processor of 99 MHz.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS

A short retrieval program, COVARD,  and the result of a sample execution of the program are included in  the package. COVARD reads the multigroup cross-section and covariance data in the condensed ENDF-like format of COVILS and transforms the data into engineering format (with zeros present explicitly and groups reordered to the conventional high-to-low order). This version of COVARD retrieves and prints the cross sections and the covariance matrix for a single "wired-in" reaction  pair. The output resulting from executing COVARD, as written with no input required, is included in the code package.

10. REFERENCES

- D.W. Muir
  COVFILS-2: Neutron Data and Covariances for Sensitivity and
  Uncertainty Analysis,
  Fusion Techn. 10 (3), part 2B, 1461 (November 1986).
- D.W. Muir
  The Evaluation and Application of Redundant-Cross-Section
  Covariances,
  Los Alamos National Laboratory report LA-UR-86-3786-Rev (November
  1986).
- J.W. Davidson, D.J. Dudziak, D.W. Muir, J. Stepanek, and C.E.
  Higgs
Recent Joint Developments in Cross-Section Uncertainty Analysis at    Los Alamos and EIR.
Los Alamos National Laboratory report LA-UR-87-219 (January 1987).

- D.W. Muir and R.J. LaBauve:
  COVFILS - A 30-Group Covariance Library Based on ENDF/B-V
  LA-8733-MS (March 1981).

11. MACHINE REQUIREMENTS:

The filesize of the Covariance Library file is about 900 Kbyte.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

The auxiliary program COVARD was executed on a PC-DELL  equipped with a Pentium processor of 99 MHz under MS-DOS. The Lahey  system F77L/EM-32 compiler Version 5.20 and linker Version 5.10 were used.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

         D.W. Muir
         Applied Nuclear Science Group
         Los Alamos National Laboratory

File name	File description	Records
DLC0091_02.001	Information file of library ZZ-COVFILS	121
DLC0091_02.002	COVFILS Library file (ASCII)	11299
DLC0091_02.003	Source code of auxiliary program COVARD	170
DLC0091_02.004	Original IBM JCL file	17
DLC0091_02.005	Output file produced by the program COVARD	207
DLC0091_02.006	DOS file-names	5