Computer Programs
NEA-0478 FEMB.
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

top ]
1. NAME OR DESIGNATION OF PROGRAM:  FEMB.
top ]
2. COMPUTERS
To submit a request, click below on the link of the version you wish to order. Rules for end-users are available here.
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
top ]
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.
top ]
4. METHOD OF SOLUTION

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

Mesh subdivision capability, gamma matrices, 1 inner per outer iteration, high order approximations.
top ]
8. RELATED OR AUXILIARY PROGRAMS: RELATED AND AUXILIARY PROGRAMS
top ]
9. STATUS
Package ID Status date Status
NEA-0478/01 06-AUG-1987 Screened
top ]
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.
top ]
11. MACHINE REQUIREMENTS:  Disc storage is used.
top ]
12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0478/01 ALGOL
top ]
13. SOFTWARE REQUIREMENTS: OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED
top ]
14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS
top ]
15. NAME AND ESTABLISHMENT OF AUTHOR

         IB Misfeldt
         Department of Reactor Technology
         Research Establishment
         RISO
         Denmark
top ]
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
top ]
17. CATEGORIES
  • C. Static Design Studies

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