Computer Programs
NEA-0108 ALCI.
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NEA-0108 ALCI.

ALCI, Homogeneous 2-D MultiGroup Neutron Diffusion in X-Z, R-Z, R-Theta Geometry with Criticality Search

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1. NAME OR DESIGNATION OF PROGRAM:  ALCI.
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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
ALCI NEA-0108/01 Tested 01-DEC-1973

Machines used:

Package ID Orig. computer Test computer
NEA-0108/01 IBM 370 series IBM 370 series
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3. NATURE OF PHYSICAL PROBLEM SOLVED

Solves the homogeneous multigroup two-dimensional neutron diffusion equations in the x-y, r-z and r-theta geometries. Geometrical and composition criticality searches are allowed. The adjoint problem can be solved optionally.
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4. METHOD OF SOLUTION

The internal iterations are treated by the alternating directions method. The external iterations are treated by the Chebyshev extrapolation technique.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

                                   ALCI-1     ALCI-2
          maximum number of groups    12          3
          maximum number of points  6000       3600
          maximum number of regions  300       1000
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6. TYPICAL RUNNING TIME
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7. UNUSUAL FEATURES: UNUSUAL FEATURES OF THE PROGRAM
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8. RELATED AND AUXILIARY PROGRAMS

The version distributed by the library is a translation of the original (written in French FORTRAN) with minor modifications in the standard French library subroutines.
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9. STATUS
Package ID Status date Status
NEA-0108/01 01-DEC-1973 Tested at NEADB
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10. REFERENCES
NEA-0108/01, included references:
- J.P. Bayard et al.:
  Specification d'un Code de Diffusion Multigroupe a deux
  Dimensions: ALCI
  CEA - R 2747 (1965).
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11. HARDWARE REQUIREMENTS: MACHINE REQUIREMENTS
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0108/01 FORTRAN-IV
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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED:  FORTRAN monitor.
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14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:  The programme is divided into 5 links.
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15. NAME AND ESTABLISHMENT OF AUTHOR

    J.P. Bayard, A. Guillou, B. Lago, M.J. Bureau du Colombier, G. Gillou, C. Vasseur
    C.E.N. Saclay
    France
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16. MATERIAL AVAILABLE
NEA-0108/01
File name File description Records
NEA0108_01.001 SYSTEM SUBROUTINES (ASSEMBLER) 1257
NEA0108_01.002 SOURCE PROGRAM (FORTRAN) 5902
NEA0108_01.003 OVERLAY CONTROL CARDS 15
NEA0108_01.004 SAMPLE PROBLEM 27
NEA0108_01.005 OUTPUT LIST OF SAMPLE PROBLEM 720
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17. CATEGORIES
  • C. Static Design Studies

Keywords: criticality searches, multigroup, neutron diffusion equation, numerical solution, r-theta, r-z, two-dimensional, x-y.