Computer Programs
NEA-1344 ZZ-GROUPSTRUCTURES.
last modified: 15-JAN-1991 | catalog | categories | new | search |

NEA-1344 ZZ-GROUPSTRUCTURES.

ZZ GROUPSTRUCTURES, VITAMIN-J, XMAS, ECCO-33, ECCO2000 Standard Group Structures

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1. NAME

ZZ-GROUPSTRUCTURES.

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2. COMPUTERS
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Program name Package id Status Status date
ZZ-GROUPSTRUCTURES NEA-1344/01 Tested 15-JAN-1991

Machines used:

Package ID Orig. computer Test computer
NEA-1344/01 IBM 3090 DEC VAX 8810
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3. DESCRIPTION

Within the International Evaluation Cooperation, four energy group structures for multigroup cross section libraries were defined and adopted. The main purpose is to facilitate the inter-laboratory benchmarking of the evaluated files: ENDF/B-VI, JEF-2, JENDL-3. These group structures are:

  1. VITAMIN-J, a 175 neutron and 42 photon group structure aimed at fission and fusion reactor shielding and for fusion blanket shielding (based on VITAMIN-J and -D group structures).

  2. XMAS, a 172 neutron group structure, based on group structures formerly used with APOLLO and WIMS. This group structure is aimed at thermal and intermediate spectra cell calculations.

  3. ECCO-33, a 33 neutron group structure forming a subset of the VITAMIN-J structure. It is aimed at benchmarking fast reactor criticality calculations.

  4. ECCO-2000, a 1968 neutron fine group structure based on a lethargy grid of 1/120. It contains all the energy boundaries of the group structures VITAMIN-J, XMAS, and ECCO-33.

 

A computer program is provided for producing a weighting spectrum for group averaging purposes. This spectrum is the one adopted for the VITAMIN-J group cross section libraries and consists of

  • temperature dependent thermal Maxwellian

  • 1/E slowing down spectrum

  • fission spectrum

  • fusion spectrum.

The computer produces a table which is linearly interpolable to a specified tolerance.

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4. METHODS

The program replaces the analytical form of the weighting spectrum by a table of energy versus weight in which the interpolation law is linear-linear. It uses a multipoint fractional error thinning algorithm to minimize the size of the table.

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6. TYPICAL RUNNING TIME
NEA-1344/01
The test problem required about 4 seconds of CPU on a VAX 8810 computer.
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7. UNUSUAL FEATURES OF THE PROGRAM

The function WFUN describing the weighting function can be replaced by one specified by the user.

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8. RELATED OR AUXILIARY PROGRAMS

NJOY. ZZ-VITAMIN-C/B, WIMS/D.

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9. STATUS
Package ID Status date Status
NEA-1344/01 15-JAN-1991 Tested at NEADB
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10. REFERENCES
NEA-1344/01, included references:
- E. Sartori, OECD/NEA Data Bank:
  Standard Energy Group Structures of Cross Section Libraries for
  Reactor Shielding, Reactor Cell and Fusion Neutronics
  Applications: VITAMIN-J, ECCO-33, ECCO-2000 and XMAS
  JEF/DOC-315 Revision 3 - DRAFT (December 11, 1990).
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11. HARDWARE REQUIREMENTS
NEA-1344/01
Main storage requirements are 350 Kbytes on a VAX 8810  computer.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-1344/01 FORTRAN-77
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13. SOFTWARE REQUIREMENTS
NEA-1344/01
VMS (VAX 8810).
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15. NAME AND ESTABLISHMENT OF AUTHORS

Enrico Sartori
NEA Data Bank
Bat. 445
91191 GIF-SUR-YVETTE CEDEX
France

 

And

 

G.C. Panini
TIB-CALC-DATINV
ENEA-CRE E. Clementel
Viale Ercolani 8
40138 BOLOGNA
Italy

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16. MATERIAL AVAILABLE
NEA-1344/01
File name File description Records
NEA1344_01.001 Information File 83
NEA1344_01.002 VITAMIN-J (175) Neutron Group Boundaries 31
NEA1344_01.003 VITAMIN-J (42) Gamma Group Boundaries 9
NEA1344_01.004 XMAS (172) Neutron Group Boundaries 30
NEA1344_01.005 ECCO-33 (33) Neutron Group Boundaries 7
NEA1344_01.006 ECCO-2000 (1968) Neutron Group Boundaries 330
NEA1344_01.007 VITAMIN-J Spectrum Generation Program 459
NEA1344_01.008 Dummy plotting routines 22
NEA1344_01.009 JCL for running spectrum generation program 23
NEA1344_01.010 Sample Problem output spectra 1013
NEA1344_01.011 Sample Problem printed output 10
NEA1344_01.012 Group Structures Comparison 1976
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17. CATEGORIES
  • Z. Data

Keywords: group constants, neutrons, photons, spectra.