NEA-0312 EXPANDA-5.

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

NAME OR DESIGNATION OF PROGRAM, COMPUTER, PROBLEM, METHOD OF SOLUTION, RESTRICTIONS, CPU, FEATURES, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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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.