NEA-0311 EXPANDA-4.

EXPANDA-4, 1-D Neutron Diffusion in Slab, Spherical Geometry from JAERI Fast-Set with Criticality Calculation

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-4.

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2. COMPUTERS

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Program name	Package id	Status	Status date
EXPANDA-4	NEA-0311/01	Tested	01-DEC-1971

Machines used:

Package ID	Orig. computer	Test computer
NEA-0311/01	IBM 360 series	IBM 360 series

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3. NATURE OF PHYSICAL PROBLEM SOLVED

EXPANDA-4 solves the one-dimensional diffusion equation in slab, cylinder or sphere geometry. As the coefficients of the equation, it calculates effective cross sections from the library data of JAERI-Fast set in 25 group structure before it automatically transfers the control to the criticality calculation. The criticality adjustment is, if necessary, done by adjusting the thickness of one of the reactor 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.

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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-0311/01	01-DEC-1971	Tested at NEADB

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10. REFERENCES

- T. Suzuki:
  EXPANDA-4, The One-Dimensional Diffusion Equation Code for Fast
  Reactors Using the JAERI-Fast Set
  JAERI-Memo 3660 (1969) (Written in Japanese.)

NEA-0311/01, included references:

- S. Katsuragi and T. Suzuki:
EXPANDA: The One-Dimensional Diffusion Equation Code for Fast Reactors
JAERI-1091 (1965)
- S. Katsuragi and T. Suzuki:
EXPANDA-2: Improvement of the EXPANDA,
The One-Dimensional Diffusion Equation Code for Fast Reactors
JAERI-1118 (1966)
- T. Suzuki:
EXPANDA-4: The One-Dimensional Diffusion Equation Code for Fast Reactors
using the JAERI-FAST-SET
JAERI-memo-3660 (1969)
- EXPANDA-5: The One-Dimensional Diffusion Equation Program for Fast Reactors
consisting of Two-Region Hexagonal Lattices
JAERI-1210 (Feb. 1972)

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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 the program tape.)

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0311/01	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-0311/01

File name	File description	Records
NEA0311_01.001	INFORMATION	4
NEA0311_01.002	SOURCE PROGRAMME + DD CARDS +INPUT CARDS	1423
NEA0311_01.003	PRINTED OUTPUT	3436

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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.