NEA-0313 EXPANDA-6.

EXPANDA-6, 1-D Neutron Diffusion in Slab, Cylindrical, Spherical Geometry from JAERI Fast-Set with PuO2 UO2 Mixture

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS, TYPICAL RUNNING TIME, 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-6.

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2. COMPUTERS

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Program name	Package id	Status	Status date
EXPANDA-6	NEA-0313/01	Tested	01-DEC-1971

Machines used:

Package ID	Orig. computer	Test computer
NEA-0313/01	IBM 360 series	IBM 360 series

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3. NATURE OF PHYSICAL PROBLEM SOLVED

EXPANDA-6 solves the one-dimensional diffusion equation in slab, cylinder or spherical geometry. 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 the usual concentration search together with an optional search by changing concentration of PU02 in the PU02-U02 mixture.

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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.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

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6. TYPICAL RUNNING TIME: About 2 or 3 minutes for the typical case.

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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-0313/01	01-DEC-1971	Tested at NEADB

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10. REFERENCES

- T.Suzuki:
EXPANDA-3 EXPANDA-6, The One-Dimensional Diffusion Equation Codes for Fast Reactors with an Option of Concentations Search
JAERI-Memo 4472 (1971) (written in Japanese).

NEA-0313/01, included references:

- Expanda-3, Expanda-6 (JAERI-M 4472 1971)

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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 programme tape.)

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0313/01	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 programme 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-0313/01

File name	File description	Records
NEA0313_01.001	INFORMATION	4
NEA0313_01.002	SOURCE PROGRAMME +DD+ INPUT CARDS	1670
NEA0313_01.003	PRINTED OUTPUT	4795

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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, neutron flux, one-dimensional, slabs, spheres.