last modified: 25-FEB-1982 | catalog | categories | new | search |

NEA-0667 DIFFAX.

DIFFAX, Axial Streaming for Hexagonal Lattices in Gas Cooled FBR, Slab Geometry Diffusion

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1. NAME OR DESIGNATION OF PROGRAM:  DIFFAX.
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2. COMPUTERS
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Program name Package id Status Status date
DIFFAX NEA-0667/01 Tested 25-FEB-1982

Machines used:

Package ID Orig. computer Test computer
NEA-0667/01 CDC 7600 CDC 7600
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3. DESCRIPTION OF PROBLEM OR FUNCTION

The axial streaming is calculated for hexagonal lattices of the typical gas-cooled fast reactor and also for slab geometry.
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4. METHOD OF SOLUTION

Diffusion theory is applied with a buckling- dependent diffusion coefficient. A flux distribution with a constant buckling throughout the lattice is assumed.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:
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6. TYPICAL RUNNING TIME

NEA-DB executed the test case on CDC 7600 in  19.5 seconds.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
NEA-0667/01 25-FEB-1982 Tested at NEADB
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10. REFERENCES

- B. Pellaud:
  "The Physics Design of the Gas-Cooled Fast Breeder Reactor
  Demonstration Plant"
  GA-10509 (1971).
- E. Eisemann:
  "Anisotropic Diffusion in Gas-Cooled Fast Breeder Reactors"
  KFK 1577 (1972) (in German).
- D.J. Behrens:
  "The Effect of Holes in a Reacting Material on the Passage of
  Neutrons"
  Proc. Phys. Soc. London 62A (1949).
- P. Benoist:
  "Theorie du coefficient de diffusion des neutrons dans un reseau
  comportant des cavites"
  CEA-R 2278 (1964).
NEA-0667/01, included references:
-  P. Koehler and J. Ligou:
    "The Axial Streaming Problem in Gas-Cooled Fast Reactors"
    EIR Report No. 244 (October 1973)
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11. MACHINE REQUIREMENTS:  Main storage 1733 octal words on CDC 7600.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0667/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
SCOPE 2.1 (CDC 7600).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHOR

          P. Kohler and J. Ligon
          Eidgenoessisches Institut Reaktorforschung
          CH-5303 Wuerenlingen
          Switzerland
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16. MATERIAL AVAILABLE
NEA-0667/01
File name File description Records
NEA0667_01.002 DIFFAX INFORMATION 19
NEA0667_01.003 DIFFAX SOURCE PROGRAM CARD IMAGES FTN-4 667
NEA0667_01.004 DIFFAX INPUT FOR TEST CASE 4
NEA0667_01.005 DIFFAX OUTPUT OF TEST CASE 1341
NEA0667_01.006 DIFFAX JCL FOR TEST CASE 17
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17. CATEGORIES
  • J. Gamma Heating and Shield Design

Keywords: buckling, diffusion equations, fast reactors, gas cooled reactors.