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NESC0281 RABBLE.

RABBLE, Cross-Sections from Single-Level Resonance Parameter, Homogeneous or Heterogeneous Infinite System

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1. NAME OR DESIGNATION OF PROGRAM:  RABBLE.
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2. COMPUTERS
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Program name Package id Status Status date
RABBLE NESC0281/01 Tested 01-NOV-1972

Machines used:

Package ID Orig. computer Test computer
NESC0281/01 CDC 6500 CDC 6500
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3. NATURE OF PHYSICAL PROBLEM SOLVED

RABBLE computes effective cross sections for above thermal energies based on resolved single-level resonance parameters for infinite homogeneous or heterogeneous systems.
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4. METHOD OF SOLUTION

The cell is divided into regions, and the energy span is divided into many narrow groups of equal lethargy width. Regional reaction rates are computed from slowing down sources, first flight escape and transmission probabilities and interface currents that are obtained from a statement of neutron conservation.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of

     5 compositions
    20 regions
   800 resonances
    12 nuclides
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6. TYPICAL RUNNING TIME

Running time is dependent on the number of regions, number of resonances, and number of groups. A problem with  25 resonances and 3000 fine groups requires 2 to 4 minutes on the CDC3600.
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7. UNUSUAL FEATURES OF THE PROGRAM

Because it is based on space and lethargy dependent slowing down sources, RABBLE is well-suited for problems where overlapping and mutual shielding of resonances is significant. The cell may have more than two compositions. Each composition may contain resonant nuclides and may be at a different  temperature.
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8. RELATED AND AUXILIARY PROGRAMS

This problem is an extension of RIFF RAFF (ACC Abstract 213). It uses the QUICKW subroutine to compute Doppler-broadened line shape functions. The program WLIB is used to  prepare an input tape (LUN 10) containing interpolation tables for the real and imaginary parts of the complex probability integral. The program FLAT is used to prepare an input tape (LUN 11) containing the interpolation tables for escape and transmission probabilities.
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9. STATUS
Package ID Status date Status
NESC0281/01 01-NOV-1972 Tested at NEADB
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10. REFERENCES

- P.H. Kier and A.A. Robba:
  RABBLE - A Program for Computation of Resonance Absorption in Multi-Region Reactor Cells.
  ANL-7326, April 1967.
- P.H. Kier:
  A Method of Computing Resonance Integrals in Multi-Region Reactor Cells, International Conference Research.
  Reactor Utilization and Reactor Mathematics, Mexico City, May
1967.
- Argonne Code Center Programming Note 68-7.
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11. MACHINE REQUIREMENTS:  50k high speed memory with two input tapes.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0281/01 FORTRAN-IV
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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED:  SCOPE.
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14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

The  memory requirements can be reduced to permit use on a 32k machine by reducing the size of arrays associated with the number of resonances, the number of regions or compositions and the number of  groups.
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15. NAME AND ESTABLISHMENT OF AUTHOR

                 P. H. Kier
                 Reactor Physics Division
                 Argonne National Laboratory
                 9700 South Cass Avenue
                 Argonne, Illinois  60439
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16. MATERIAL AVAILABLE
NESC0281/01
File name File description Records
NESC0281_01.001 SOURCE PROGRAMME 826
NESC0281_01.002 SAMPLE PROBLEM 37
NESC0281_01.003 AUXILIARY PROGRAMME WLIB 201
NESC0281_01.004 AUXILIARY PROGRAMME FLAT 133
NESC0281_01.005 PRINTED OUTPUT OF RABBLE 534
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17. CATEGORIES
  • B. Spectrum Calculations, Generation of Group Constants and Cell Problems

Keywords: cell calculation, cross sections, flux distribution, reaction rates, resonance absorption.