DLC-0137 ZZ-COVFILS-2.

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

3. DESCRIPTION OF PROGRAM OR FUNCTION


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  FORMAT: ENDF/B order

  NUMBER OF GROUPS: 74-group library

  NUCLIDES: H, Li-6, Li-7, Be, C, N, O, Na, Si, Cr, Fe, Ni, Pb.

ORIGIN: ENDF/B-V (It is a subset of the Los Alamos 187-group structure used in MATXS8).

  WEIGHTING SPECTRUM: Fusion peak at high temperatures
                      Fission spectrum near 1 MeV
1/E slowing-down spectrum in the eV-keV region                       Room-temperature Maxwellian below 0.15 eV

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COVFILS-2 is a library of multigroup neutron cross sections, scattering matrices and covariances. This 74-group library is primarily intended for use in the sensitivity and uncertainty analysis of fusion integral experiments and fusion reactor systems.
COVFILS-2 is largely based on data evaluations from the ENDF/B-V library, although some minor corrections and improvements were incorporated. In case where the covariance evaluation is missing (as in the case of Be) or judged to be inadequate, private Los Alamos evaluations, such as LA-7932-MS, are employed. The COVFILS-2 group structure was chosen to give good energy resolution at high energies. It is a subset of the Los Alamos 187-group structure used  in MATXS8. The groups are ordered in ENDF/B order (low-to-high) for  all vector data and for the covariance matrices. Full (P0-P3) transfer matrices in normal high-to-low order for all scattering reactions present in the library are also included. The elements included are:
H, 6Li, 7Li, Be, C, N, O, Na, Si, Cr, Fe, Ni, Pb.

4. METHOD OF SOLUTION:

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

6. TYPICAL RUNNING TIME

The sample problem for only one material took 14 seconds on the IBM 3033 under the MVS operating system.

The BOXR program was compiled and executed on a PC-DELL Optiplex GXM 5100 with base memory 640 Kbyte and extended memory 32  MByte, equipped with a Pentium processor of 99 MHz. A few seconds of elapsed time are required to execute the sample problem; a few minutes are required to reconstruct the complete matrix file.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS:

10. REFERENCES:

- D.W. Muir:
  COVFILS-2 - Neutron Data and Covariances for sensitivity and
  Uncertainty Analysis
  Reprint from Fusion Technology 10(3), Part 2B, pp.1461-1465
  (November 1986).
- D.W. Muir:
  The Evaluation and Application of Redundant-Cross-Section
  Covariances
  LA-UR-86-3786-REV (November 1986).
- J.W. Davidson et al.:
  Recent Joint Developments in Cross-Section Uncertainty Analysis at
  Los Alamos and EIR
  LA-UR-87-219 (January 1987).

11. MACHINE REQUIREMENTS:

The filesize of the COVFILS-2 library (ASCCII) is 3.1 Mbyte. About 71 Mbyte of diskspace are required to reconstruct the complete matrix file. The filesize of the BOXR executable is of 407  Kbyte.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

The code BOXR was executed in a PC-DELL equipped with a Pentium processor at 99 Mhz, under MS-DOS 6.2. The Lahey compiler system F77L/EM-32 (compiler Version 5.20 and linker Version 5.1L) were used to create the BOXR executable file.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

Both to save space and to simplify the application of these data to  uncertainty analyses, redundant reactions are omitted from COVFILS-2. BOXR reads from Fortran unit 20 those portions of the library which have been selected by the user and writes the complete matrix to Fortran unit 21. The input to reconstruct the entire library, which occupies 970,000 lines, is included in file 4 of the  package.

15. NAME AND ESTABLISHMENT OF AUTHORS

Contributed by: Radiation Safety Information Computational Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.

Developed by:   Los Alamos National Laboratory
                Los Alamos, New Mexico, USA

File name	File description	Records
DLC0137_01.001	Information file of library COVFILS-2	364
DLC0137_01.002	COVFILS-2 Library file (ASCII)	39313
DLC0137_01.003	Index file to reconstruct the full matrix	1696
DLC0137_01.004	FORTRAN-77 source file of code BOXR	204
DLC0137_01.005	PC-executable of program BOXR	0
DLC0137_01.006	Sample input file for code BOXR	3
DLC0137_01.007	Sample output file produced by BOXR	30
DLC0137_01.008	JCL file (for IBM users only !)	14
DLC0137_01.009	Auxiliary file of Lahey runtime errors/mess.	0
DLC0137_01.010	DOS file-names	9