last modified: 06-AUG-1987 | catalog | categories | new | search |

NEA-0478 FEMB.

FEMB, 2-D Homogeneous Neutron Diffusion in X-Y Geometry with Keff Calculation, Dyadic Fission Matrix

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1. NAME OR DESIGNATION OF PROGRAM:  FEMB.
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2. COMPUTERS
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Program name Package id Status Status date
FEMB NEA-0478/01 Tested 06-AUG-1987

Machines used:

Package ID Orig. computer Test computer
NEA-0478/01 BURROUGHS 6700 Many Computers
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3. NATURE OF PHYSICAL PROBLEM SOLVED

The two-dimensional neutron diffusion equation (xy geometry) is solved in the homogeneous form (Keff calculation). The boundary conditions specify each group current as a linear homogeneous function of the group fluxes (gamma  matrix concept). For each material, the fission matrix is assumed to be dyadic.
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4. METHOD OF SOLUTION

Finite element formulation with Lagrange type elements. Solution technique: SOR with extrapolation.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:  Maximum order of the  Lagrange elements is 6.
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6. TYPICAL RUNNING TIME
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7. UNUSUAL FEATURES OF THE PROGRAM

Mesh subdivision capability, gamma matrices, 1 inner per outer iteration, high order approximations.
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8. RELATED OR AUXILIARY PROGRAMS: RELATED AND AUXILIARY PROGRAMS
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9. STATUS
Package ID Status date Status
NEA-0478/01 06-AUG-1987 Screened
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10. REFERENCES

- IB Misfeldt:
  "Solution of the Multigroup Neutron Diffusion Equation by the Finite Element Method"
  RISO-M-1809.
- IB Misfeldt:
  "The Program FEMB, User's Manual"
  RISO-M-1929.
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11. MACHINE REQUIREMENTS:  Disc storage is used.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0478/01 ALGOL
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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

         IB Misfeldt
         Department of Reactor Technology
         Research Establishment
         RISO
         Denmark
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16. MATERIAL AVAILABLE
NEA-0478/01
File name File description Records
NEA0478_01.001 Iformation file 33
NEA0478_01.002 FEMB source program 1564
NEA0478_01.003 FEMB Input Sample Problem 76
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17. CATEGORIES
  • C. Static Design Studies

Keywords: Lagrange equations, finite element method, neutron diffusion equation, two-dimensional, x-y.