Computer Programs
DLC-0016 ZZ-COBB.
last modified: 01-APR-1971 | catalog | categories | new | search |

DLC-0016 ZZ-COBB.

ZZ COBB, 123 Neutron-Group Cross-Section Library from ENDF/B for XSDRN Calculation

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1. NAME

ZZ-COBB.

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2. COMPUTERS
To submit a request, click below on the link of the version you wish to order. Rules for end-users are available here.
Program name Package id Status Status date
ZZ-COBB DLC-0016/01 Tested 01-APR-1971

Machines used:

Package ID Orig. computer Test computer
DLC-0016/01 Many Computers Many Computers
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3. DESCRIPTION

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
FORMAT: XSDRN

 

NUMBER OF GROUPS: 123

 

NUCLIDES: H, D, He, 9Be, 10B, 12C, 16O, 23Na, Mg, 27Al, Ti, Cr, 55Mn, Fe, Ni, Cu, 63Cu, 65Cu, 93Nb, Mo, 135Xe, 149Sm, 151Eu, 153Eu, Gd, 164Dy, 175Lu, 176Lu, 182W, 183W, 184W, 186W, 185Re, 187Re, 197Au, 233U, 234U, 235U, 236U, 238U, 237Np, 238Pu, 239Pu, 240Pu, 241Pu, 242Pu, 241Am, 243Am, and 244Cm.

 

ORIGIN: Mainly ENDF/B

 

WEIGHTING SPECTRUM: Fast cross sections -> 1/E (14 Mev to .414 eV) Thermal cross sections -> 1/E (1.86 eV to 0.125 eV) -> Maxwell-Boltzmann (0.125 eV to 0.0047 eV)

 

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
The library is intended to be a source of evaluated data for the cross section preparation code XSDRN. It supplements, rather than replaces, the existing XSDRN master library which is distributed with the code package.

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4. METHODS

This library was compiled during the course of investigations by W. R. Cobb of the Reactor Division at Oak Ridge National Laboratory. Portions of the data included were prepared by R. Q. Wright of the ORNL Mathematics Division.

 

The library contains ENDF/B version II cross sections processed through several steps (primarily by PSR-13/SUPERTOG) into the standard XSDRN 123-group energy structure. These steps are:

  1. Process fast cross sections with PSR-13/SUPERTOG into standard 99-group GAM-II energy structure (14 MeV - 0.414 eV), using a "1/E" weighting function, and produce a GAM-II tape. (This step was performed by R. Q. Wright, Mathematics Division, ORNL.)

  1. Process thermal cross sections with PSR-13/SUPERTOG into standard 30-group THERMOS energy group structure (1.86 eV - 0.0047 eV), using a Maxwell-Boltzmann distribution with temperature 293° K as a weighting function for E < 0.125 eV coupled to a "1/E" weighting function for 0.125 eV < E < 1.86 eV.

  1. Compute room temperature free-gas kernels, using the THERMOS tape-making program, and combine with results of step b into a THERMOS tape.

  1. Combine the GAM-II and THERMOS tapes into a 123-group XSDRN tape using an unpublished ORNL code written specifically for this purpose.

 

This library contains data for a P3 approximation to the angular scattering for all ENDF/B version II nuclides except hydrogen; however, an older set of cross sections for hydrogen in water were included for completeness. Nuclides whose cross sections are not given by ENDF/B in elemental form have been processed both as resonance and infinite dilute cross sections.

 

The XSDRN I.D. numbers of nuclides on this tape are of the form 10,000 * Z + 10 * A + S

where Z is the atomic number of the element, A is the atomic weight of the isotope, and S is 0 or 1, depending on whether the cross sections are in the form of resonance parameters or are given at infinite dilution. An I.D. number for which A=0 implies that the cross sections are for the naturally occurring element.

 

 

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6. TYPICAL RUNNING TIME

JUANITA: On the IBM 360/91 computer, compilation and execution time for converting the entire DLC-16/COBB library from an unformatted to a formatted tape took 2 minutes. No study has been made by RSIC of typical running times for SUP or SECS.

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8. RELATED OR AUXILIARY PROGRAMS
  • JUANITA: A Program to Convert from Formatted to Unformatted XSDRN Master Library Tapes and Vice Versa.

  • SUP: A Program to Update an Unformatted XSDRN Master Library Tape.

  • SECS: A Program to Edit an Unformatted XSDRN Master Library Tape.

These programs are provided for manipulating DLC-16/COBB data; these were written by N. M. Greene of ORNL for use with data for the XSDRN discrete ordinates spectral averaging code. The first code, JUANITA, will convert an unformatted XSDRN master library tape to a formatted one, or vice versa. XSDRN requires an unformatted (binary) tape for input, but DLC-16/COBB has been put in formatted (BCD card images) form for easy transmittal between installations. The second code, SUP, can be used to update and the third code, SECS, to edit an unformatted XSDRN master library tape.

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9. STATUS
Package ID Status date Status
DLC-0016/01 01-APR-1971 Tested at NEADB
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10. REFERENCES
DLC-0016/01, included references:
- W. R. Cobb, "New XSDRN Library," Informal note (November 1970).
- N. M. Greene, "JUANITA: Instructions for Master Cross Section Library
Converter Program," Informal note (January 1971). "XSDRN Tape Format," Informal
note.
- N. M. Greene, "SUP: Input Requirements for XSDRN Master Cross Section Library
Update Program," Informal note.
- N. M. Greene, "SECS: Instructions for Master Cross Section Library Listing
Code," Informal note.
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12. PROGRAMMING LANGUAGE(S) USED
No specified programming language
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15. NAME AND ESTABLISHMENT OF AUTHORS

Oak Ridge National Laboratory
Union Carbide Corporation
Nuclear Division
Oak Ridge, Tennessee, U.S.A

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16. MATERIAL AVAILABLE
DLC-0016/01
File name File description Records
DLC0016_01.001 XSDRN LIBRARY (77 ELEMENTS) 79872
DLC0016_01.002 JUANITA SOURCE PROGRAM 238
DLC0016_01.003 SUP SOURCE PROGRAM 448
DLC0016_01.004 SECS SOURCE PROGRAM 300
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17. CATEGORIES
  • Z. Data

Keywords: ENDF/B, cross sections, data, multigroup, neutrons.