NEA-0667 DIFFAX.

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

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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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.