NEA-0319 SIMPLED-4.

SIMPLED-4, 1-D Neutron Diffusion in Spherical, Cylindrical, Planar Geometry from JAERI Fast-Set and ABBN

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF THE PHYSICAL PROBLEM SOLVED, 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, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: SIMPLED-4.

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2. COMPUTERS

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Program name	Package id	Status	Status date
SIMPLED-4	NEA-0319/01	Tested	01-DEC-1971

Machines used:

Package ID	Orig. computer	Test computer
NEA-0319/01	IBM 360 series	IBM 360 series

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3. NATURE OF THE PHYSICAL PROBLEM SOLVED

SIMPLED-4 solves the one- dimensional diffusion equation and its adjoint equation in finite spherical, cylindrical and plane geometries, and computes DK/K of the perturbed system by the first order perturbation method. The code uses the JAERI-Fast set and ABBN set composed of 25-group cross sections, and deals with the heterogeneity effects of fuel elements by the equivalence relation. The code is able to compute the nuclear characteristics of central void reactors.
Can be used as the outer boundary conditions of the system.

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4. METHOD OF SOLUTION

For the diffusion equation, the source iteration technique is used.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Number of regions and mesh intervals must be less than 10 and less than 100, respectively. The cross section library tape must be prepared for the code by the JAERI LTFR-4 programme.

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6. TYPICAL RUNNING TIME

About 2.2 minutes are required for a two region sphere, 80 mesh intervals and one perturbation calculation problem on the IBM 360/75 computer.

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7. UNUSUAL FEATURES OF THE PROGRAM

For a void region, a suitable boundary condition is set up.

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8. RELATED AND AUXILIARY PROGRAMS: LTFR-4, EXPANDA-4.

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9. STATUS

Package ID	Status date	Status
NEA-0319/01	01-DEC-1971	Tested at NEADB

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10. REFERENCES

REFERENCES.
- Tomoo Suzuki:
  EXPANDA-4 - The One-Dimensional Diffusion Equation Code for Fast
  Reactors Using the JAERI-Fast-Set
  JAERI-Memo 3660 (July 1969).
- Hideo Nishimura:
  One-Dimensional Diffusion and Perturbation Code, SIMPLED-D (no.4)
  JAERI-Memo 4381 (March 1971).

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11. MACHINE REQUIREMENTS

Core memories occupied about 58k words. 1 magnetic tape unit and 4 scratch units are required.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0319/01	FORTRAN-IV

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13. SOFTWARE REQUIREMENTS: OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED

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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

       Hideo Nishimura
       JAERI
       Tokai-mura, Naka-gun
       Ibaraki-ken, Japan.

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16. MATERIAL AVAILABLE

NEA-0319/01

File name	File description	Records
NEA0319_01.001	INFORMATION	4
NEA0319_01.002	SOURCE PROG.+OVERLAY,DD CARDS+INPUT DATA	2192
NEA0319_01.003	PRINTED OUTPUT	5302

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17. CATEGORIES

C. Static Design Studies

Keywords: cylinders, diffusion equations, fast reactors, fuel elements, iterative methods, one-dimensional, perturbation theory, slabs, spheres, voids.