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IAEA1389 NRSC.

NRSC, Neutron Resonance Spectrum Calculation System

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1. NAME OR DESIGNATION OF PROGRAM:  NRSC.
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2. COMPUTERS
To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.
Program name Package id Status Status date
NRSC IAEA1389/01 Testing in progress 03-MAR-2004

Machines used:

Package ID Orig. computer Test computer
IAEA1389/01 PC Pentium
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3. DESCRIPTION OF PROGRAM OR FUNCTION

The NRSC system is a package of four programs for calculating detailed neutron spectra and related quantities, for homogeneous mixtures of isotopes and cylindricized reactor pin cells, in the energy resonance region, using ENDF/B evaluated nuclear data pre-processed with NJOY or Cullen's codes up to the Doppler Broadening and unresolved resonance level.
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4. METHODS

NRSC consists of four programs: GEXSCO, RMET21, ALAMBDA and WLUTIL.
GEXSCO prepares the nuclear data from ENDF/B evaluated nuclear data pre-processed with NJOY or Cullen's codes up to the Doppler Broadening or unresolved resonance level for RMET21 input.
RMET21 calculates spectra and related quantities for homogeneous mixtures of isotopes and cylindricized reactor pin cells, in the energy resonance region, using slowing-down algorithms and, in the case of pin cells, the collision probability method.
ALAMBDA obtains lambda factors (Goldstein-Cohen intermediate resonance factors in the formalism of WIMSD code) of different isotopes for including on WIMSD-type multigroup libraries for WIMSD or other cell-codes, from output of RMET21 program.
WLUTIL is an auxiliary program for extracting tabulated parameters related with RMET21 program calculations from WIMSD libraries for comparisons, and for producing new WIMSD libraries with parameters calculated with RMET21 and ALAMBDA programs.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

GEXSCO program has fixed array dimensions that are suitable for processing all reasonable outputs from nuclear data pre-processing programs.
RMET21 program uses variable dimension method from a fixed general array.
ALAMBDA and WLUTIL programs have fixed arrays that are adapted to standard WIMSD libraries.
All programs can be easily modified to adapt to special requirements.
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6. TYPICAL RUNNING TIME

GEXSCO: minutes (1 to 5, depending on number of fine lethargy groups required and computer).
RMET21: minutes to hours (depending on the number of fine lethargy groups, the geometry mesh on pin cell problems and computer)
ALAMBDA and WLUTIL: a few seconds.

    Test    Time (min-Pentium III-500 Mhz)
      1      1  
      2     29  
      3     10  
      4     22  
      5      1
      6      1   
      7      1   
      8      1   
      9     72                                                       
     10     70
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7. UNUSUAL FEATURES

NRSC system has been designed as a tool for research and development on different features and approximations related to neutron resonance calculations in the frame of reactor physics. One of the main uses of the system is the production of resonance integrals for homogeneous mixtures of a resonance isotope and hydrogen on different dilutions and lambda factors for inclusion in WIMSD libraries. Other use of the system is the calculation of effective absorption and fission cross sections on broad energy groups in the resonance region for resonance isotopes on cylindricized reactor pin cells, for comparisons with the results of similar calculations using approximated methods such as the equivalence method included in WIMSD code.
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8. RELATED OR AUXILIARY PROGRAMS

The NRSC system supersedes the previously released package :
RMET21 - IAEA 1255/01, distributed by NEA Data Bank.
Related and auxiliary programs:
WIMSD code (outputs of NRSC system can be used for producing resonance parameters for WIMSD libraries)
WILLIE program (used by WLUTIL program of NRSC system for convert the formats of WIMSD libraries from binary to decimal and vice-versa)
Cullen's pre-processing codes LINEAR, RECENT, SIGMA1 or NJOY system (for preparation of Doppler broadened cross sections needed by GEXSCO program of NRSC system)
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9. STATUS
Package ID Status date Status
IAEA1389/01 03-MAR-2004 in preparation
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10. REFERENCES

F.Leszczynski
Neutron Resonance Treatment with Details in Space and Energy for Pin Cells and Rod Clusters
Ann.nucl.Energy, Vol.14, No.11,pp.589-601, 1987.
IAEA1389/01, included references:
- Francisco Leszczynski:
Neutron Resonance Spectrum Calculation system version 2001.0
User's manual
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11. HARDWARE REQUIREMENTS

The number of significant digits for numerical real representation is important for GEXSCO and RMET21 programs of NRSC system. More than 9 digits are required for a good performance and exact results. For this reason, these programs may be used on machines that permit these features, and using double precision when needed.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
IAEA1389/01 FORTRAN-77
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13. SOFTWARE REQUIREMENTS:   MS-DOS
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

The four programs included in the NRSC system have been written in standard Fortran 77 without system routines (except date and time routine TIMEDAT on GEXSCO and RMET21 programs).
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15. NAME AND ESTABLISHMENT OF AUTHORS

Francisco Leszczynski
Centro Atomico Bariloche
Comision Nacional de Energia Atomica
Argentina.
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16. MATERIAL AVAILABLE
IAEA1389/01
NRSCDIR  TXT   List of files
README   TXT  Instructions for installing NRSC system
\DOCS  (DIR)   Documents and User's Manual
\EXECUT   (DIR)   Executable files
\INPUT (DIR)   Inputs of test cases
\OUTPUT  (DIR)   Reference outpus of test cases
\SOURCE (DIR)    Source files (.for)
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17. CATEGORIES
  • A. Cross Section and Resonance Integral Calculations
  • B. Spectrum Calculations, Generation of Group Constants and Cell Problems

Keywords: ENDF/B, collisions, cross sections, equations, multigroup, neutron, resonance, slowing-down.