Computer Programs
DLC-0018 ZZ-NAB.
last modified: 01-APR-1974 | catalog | categories | new | search |

DLC-0018 ZZ-NAB.

ZZ NAB, 100 Neutron-Group Cross-Section Library of Na and Al for ANISN, DOT, MORSE Neutron Transport

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1. NAME

ZZ- NAB.

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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-NAB DLC-0018/01 Tested 01-APR-1974

Machines used:

Package ID Orig. computer Test computer
DLC-0018/01 Many Computers Many Computers
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3. DESCRIPTION

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FORMAT: ANISN, DOT, and MORSE

 

NUMBER OF GROUPS: 100 neutron group

 

NUCLIDES: sodium or sodium contained in aluminium tanks. With following impurities:

calcium     400 ppm

oxygen      200 ppm

potassium   150 ppm

hydrogen     50 ppm

 

ORIGIN: ENDF/B-3 MAT 1156 sodium and MAT 1135 aluminium.

 

WEIGHTING SPECTRUM:

  • 1/E weighting spectrum for non-thermal energies,

  • thermal group cross sections were determined by assuming a Maxwellian weighting function and a constant scattering cross section and a 1/v absorption cross section.

 

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DLC-18 is suitable for multigroup neutron transport calculations in sodium or sodium contained in aluminium tanks, such as the ORNL-LMBNR sodium benchmark experiment (2). The retrieval program manipulates such that it can be used in codes such as ANISN, DOT, and MORSE.

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4. METHODS

The 100 neutron group, P3 data were produced by the ORNL Mathematics Division, using SUPERTOG, and a 1/E weighting spectrum for non-thermal energies. The energy group structure is that used for the GAM-2 which covers the energy range from 14.92 MeV to thermal. The thermal group cross sections were determined by assuming a Maxwellian weighting function and a constant scattering cross section and a 1/v absorption cross section.

This data represents a P3 Legendre expansion approximation for neutron elastic scattering. Inelastic neutron scattering was treated as isotropic in the lab system.

The multigroup cross sections were generated from a preliminary version of the ENDF/B-3 MAT 1156 sodium and MAT 1135 aluminium. Subsequent changes to the evaluated data prior to its official release as part of ENDF/B-3 would affect the data in DLC-18/NAB somewhat, but probably not significantly.

Because the materials used in the experiment were not free from impurities, these were included as follows

 

calcium     400 ppm

oxygen      200 ppm

potassium   150 ppm

hydrogen     50 ppm

 

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6. TYPICAL RUNNING TIME

To read the NAB data from a card image tape and rewrite it on an unformatted tape requires 15 seconds on the IBM 360/91.

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8. RELATED OR AUXILIARY PROGRAMS

LIBGEN is a modified version of the library generation routine which is available in the ANISN code package. This version will read data from a card image tape, the mode by which NAB is distributed, and write an unformatted tape for direct use with ANISN.

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9. STATUS
Package ID Status date Status
DLC-0018/01 01-APR-1974 Tested at NEADB
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10. REFERENCES
DLC-0018/01, included references:
- F.R. Mynatt, M.J. Gritzner, R.E. Maerker, and B.J. McGregor:
'Fast Reactor Shielding Monthly Progress Report for March 1972, 189A no. 10028,
Activity no. 40 01 61', ORNL-TM-3800 (May 1972).
- L.R. Williams: 'Input Description for LIBGEN', Informal Notes (1972).
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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
Oak Ridge, Tennessee, U.S.A

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16. MATERIAL AVAILABLE
DLC-0018/01
File name File description Records
DLC0018_01.001 100-GRP NEUTRON X-SEC LIBRARY FOR NA, AL 4152
DLC0018_01.002 ANISN LIBRARY ROUTINE (SOURCE PROGRAM) 140
DLC0018_01.003 ANISN LIBRARY ROUTINE SAMPLE PROBLEM DD-CARD 4
DLC0018_01.004 ANISN LIBRARY ROUTINE SAMPLE PROBLEM OUTPUT 8
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17. CATEGORIES
  • ZZZ. ARCHIVE

Keywords: absorption, cross sections, data, elastic scattering, inelastic scattering, multigroup, neutrons, sodium.