last modified: 31-JAN-1995 | catalog | categories | new | search |

IAEA1173 NEHEX-3D.

NEHEX-3D, 3-D Neutron Diffusion for Fast Reactors and WWER in Hexagonal Geometry

top ]
1. NAME OR DESIGNATION OF PROGRAM:  NEHEX-3D.
top ]
2. COMPUTERS
To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.
Program name Package id Status Status date
NEHEX-3D IAEA1173/01 Tested 31-JAN-1995

Machines used:

Package ID Orig. computer Test computer
IAEA1173/01 ES-1040 DEC VAX 6000
top ]
3. DESCRIPTION OF PROGRAM OR FUNCTION

Neutronics calculation of fast  and WWER type reactors with hexagonal assemblies (determination of keff value, group neutron fluxes and thermal power).
top ]
4. METHOD OF SOLUTION

The method is based on the following ideas:
- nodal approach
- transverse integration technique
- expansion of one-dimensional neutron flux inside the node in   polynomials up to the third order
- formulation of nodal equations in the form of response matrix   equation
- solution of resulting nodal algebraic equations by means of   iterative method
top ]
5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Geometry: 30 deg. reflectional and 60 deg. rotational symmetry;
Maximum number of subassemblies :       NN = 100
Maximum number of energy groups :       NG =   4
Maximum number of axial layers  :       NZ =  20
Maximum number of different materials : NM = 50
top ]
6. TYPICAL RUNNING TIME:
IAEA1173/01
The test case included in this package was executed by  the NEA-DB on a DEC/VAX 6000-510 computer in 13 seconds of CPU time.
top ]
7. UNUSUAL FEATURES OF THE PROGRAM:  Assumption of homogeneous nodes.
top ]
8. RELATED AND AUXILIARY PROGRAMS

No auxiliary program is necessary.  NEHEX-3D is an extension of the two-dimensional program NEHEX1.
top ]
9. STATUS
Package ID Status date Status
IAEA1173/01 31-JAN-1995 Tested at NEADB
top ]
10. REFERENCES

- B. Kujal
An Effective Method of Solving the Multigroup Diffusion Problem in    Hexagonal Geometry,
  UJV 7839-R (1987).
- B. Kujal
  The Method of the Three-Domensional Multigroup Diffusion Program
  in Hexagonal Geometry (in Czech),
  UJV 8222-R (1988).
IAEA1173/01, included references:
- B. Kujal:
  NEHEX-3D - A Multigroup Diffusion Nodal Computer Code for Three
  Dimensional Hexagonal Geometry. Code Description and Validation
  NRI 8384-R,T (1987).
top ]
11. MACHINE REQUIREMENTS

- 1300kB of high speed memory (for calculation)
- printer
- card reader or discs (only for input data)
top ]
12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
IAEA1173/01 FORTRAN-IV
top ]
13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  OS/360 FORTRAN H
LEVEL 21.8.
IAEA1173/01
The program was installed by NEA-DB under VAX VMS 5.5-2. The source program was compiled on the VAX FORTRAN compiler Version 5.5-98.
top ]
14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:  Code
should be compatible with IBM 370.
top ]
15. NAME AND ESTABLISHMENT OF AUTHORS

          B. Kujal
          Nuclear Research Institute
          250 68 Rez, Czechoslovakia
top ]
16. MATERIAL AVAILABLE
IAEA1173/01
File name File description Records
IAEA1173_01.001 Information file 72
IAEA1173_01.002 NEHEX3D Fortran source 1221
IAEA1173_01.003 Test input data 87
IAEA1173_01.004 Test output data with IBM 1345
IAEA1173_01.005 Test output data with VAX 1349
IAEA1173_01.006 JCL cards for IBM 11
top ]
17. CATEGORIES
  • C. Static Design Studies

Keywords: criticality, fast reactors, hexagonal lattices, neutron diffusion equation, neutron flux, three-dimensional.