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NEA-0312 EXPANDA-5.

EXPANDA-5, 1-D Neutron Diffusion in Slab, Cylindrical, Spherical Geometry for 2 Region Fast Reactor Criticality

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1. NAME OR DESIGNATION OF PROGRAM:  EXPANDA-5.
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2. COMPUTERS
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Program name Package id Status Status date
EXPANDA-5 NEA-0312/01 Tested 01-DEC-1971

Machines used:

Package ID Orig. computer Test computer
NEA-0312/01 IBM 360 series IBM 360 series
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3. DESCRIPTION OF PROGRAM OR FUNCTION

NATURE OF PHYSICAL PROBLEM SOLVED. One-dimensional diffusion equation programme in slab, cylinder or spherical geometry, specially designed for the criticality calculations of fast reactor  which consists of two-region lattices. It calculates effective cross sections, which will be used as the coefficients of the equation, from the library data of JAERI-Fast set with 25-group structure. The criticality adjustment can be done by adjusting the thickness of one of regions. Adjoint equation can also be solved.
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4. METHOD OF SOLUTION

The central difference approximation is adopted  for the differential coefficients. The three points difference equation is solved by the ordinary set of two points recurrence formulae. An approximate method is used to take heterogeneity effects into account in estimating effective cross sections of each  nuclide in a region.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM
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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:  CONDENSE, LTFR-4.
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9. STATUS
Package ID Status date Status
NEA-0312/01 01-DEC-1971 Tested at NEADB
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10. REFERENCES

- T. Suzuki:
  EXPANDA-5, The One-Dimensional Diffusion Equation Programme for Fast Reactors Consisting of Two-Region Hexagonal Lattices
  JAERI-1210(1972) (in English).
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11. MACHINE REQUIREMENTS

About 64 k words including I/O subroutines and buffers. One magnetic tape device and one or two scratch devices. (Another tape can be used as program tape.)
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0312/01 FORTRAN-IV
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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED

IBM-360/J75 OS catalogued procedure (G-level).
FACOM-230/60 monitor system (LIBE operates the absolute address program tape).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS
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15. NAME AND ESTABLISHMENT OF AUTHOR

         Tomoo Suzuki
         JAERI
         Tokai-mura, Naka-gun
         Ibaraki-ken, Japan
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16. MATERIAL AVAILABLE
NEA-0312/01
File name File description Records
NEA0312_01.001 INFORMATION 4
NEA0312_01.002 SOURCE PROGRAMME +DD+ INPUT CARDS 1767
NEA0312_01.003 PRINTED OUTPUT 9390
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17. CATEGORIES
  • B. Spectrum Calculations, Generation of Group Constants and Cell Problems
  • C. Static Design Studies

Keywords: criticality, cross sections, cylinders, difference equations, diffusion equations, fast reactors, hexagonal lattices, neutron flux, one-dimensional, slabs, spheres.