Computer Programs

IAEA1271 GNOMER.

IAEA1271 GNOMER.

GNOMER, Core Power Distribution by 1-D, 2-D, 3-D MultiGroup Neutron Diffusion

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, 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 UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES

[ top ]

1. NAME OR DESIGNATION OF PROGRAM: GNOMER.

[ 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
GNOMER	IAEA1271/03	Tested	18-APR-1996

Machines used:

Package ID	Orig. computer	Test computer
IAEA1271/03	VAX generic,IBM PC	PC Windows,VAX generic

[ top ]

3. DESCRIPTION OF PROGRAM OR FUNCTION

GNOMER is a program which solves the multigroup neutron diffusion equation in 1D, 2D and 3D cartesian geometry. The program is designed to calculate the global core power distributions (with thermohydraulic feedbacks), as well as power distributions and homogenized cross sections over a fuel assembly.

[ top ]

4. METHOD OF SOLUTION

It uses the highly efficient Green's function nodal method.

[ top ]

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

[ top ]

6. TYPICAL RUNNING TIME

Few seconds on IBM/PC-AT-486 compatible computer for 2D geometry. Three minutes on IBM/PC-AT-486 compatible computer for 3D geometry.

IAEA1271/03

NEA-DB ran the test cases included in this package on both a VAXStation 3100 M38 and a Pentium 75MHz PC. The following execution times were found:
Tests           VAX         Lahey Fortran
----           ---         -------------
  T1        01.94 sec         00.28 sec
  T2        87.39 sec         23.62 sec
  T3       150.67 sec         34.50 sec
  T4       725.51 sec        106.23 sec
  T5        50.09 sec         17.96 sec

[ top ]

7. UNUSUAL FEATURES OF THE PROGRAM

A simple thermohydraulic module to calculate temperature distribution is included. The Reactivity Coefficient method is applied for small corrections to cross sections when core conditions differ from nominal (at which the cross sections have been tabulated) due to thermohydraulic feedbacks. -Cyclic quadrant symmetry and octant symmetry options are available.

[ top ]

8. RELATED AND AUXILIARY PROGRAMS: None.

[ top ]

9. STATUS

Package ID	Status date	Status
IAEA1271/03	18-APR-1996	Tested at NEADB

[ top ]

10. REFERENCES

- H. Finnemann, F. Benewits, M.R. Wagner:
Interface Current Techniques for Multi-Dimensional Calculations
Atomkernenergie, Bd. 30, Lfg.2 (1977).
- A. Trkov, M. Najzer, L. Skerget:
A Variant of the Green's Function Method for Neutron Diffusion
Jou.Nucl.Sci.Tech., Vol. 27, No. 8, pp. 766-777 (Aug. 1990).
- National Energy Software Center:
Benchmark Problem Book, ANL-7416, Suppl. 1,2,3 (1985).
- A. Trkov and M. Ravnik:
Effective Diffusion Homogenization of Cross Sections for PWR Core
Calculations, Nucl.Sci.Eng., Vol.116, pp.86-95, February 1994.

IAEA1271/03, included references:

- A. Trkov:
  GNOMER - Multigroup 3-Dimensional Neutron Diffusion Nodal Code
  with Thermohydraulic Feedbacks
  IJS-DP-6688 Rev. 2 (July 29, 1994).

[ top ]

11. MACHINE REQUIREMENTS: IBM/PC with 640K main memory.

IAEA1271/03

The program was installed by NEA-DB on both a VAXStation 3100 M38 and a Brett Pentium-75MHz PC with 16 MBytes of RAM.

[ top ]

12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
IAEA1271/03	FORTRAN-77

[ top ]

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED: PC-DOS version 5
(PC); VMS, OpenVMS (VAX).

IAEA1271/03

The program was installed and executed by NEA-DB on: - VAXstation running under VMS 6.1 with the VAX FORTRAN compiler version 6.2; - on PC/P75 under Windows 95 and using the Lahey FORTRAN version 5.20. compiler.

[ top ]

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS: None.

[ top ]

15. NAME AND ESTABLISHMENT OF AUTHORS

          Andrej Trkov
     "Josef Stefan" Institute
      Reactor Physics Division
     61111 Ljubljana, Jamova 39, P.O. Box 100
     Slovenia

[ top ]

16. MATERIAL AVAILABLE

IAEA1271/03

File name	File description	Records
IAEA1271_03.001	Information file	168
IAEA1271_03.002	GNOMER Fortran source file	7361
IAEA1271_03.003	Code-conversion program	155
IAEA1271_03.004	Source code splitting program	69
IAEA1271_03.005	Comp & link procedure for PC (Microsoft)	60
IAEA1271_03.006	Comp & link procedure for PC (NDP)	30
IAEA1271_03.007	Comp & link procedure for PC (Lahey)	35
IAEA1271_03.008	Installation command procedure for VAX	71
IAEA1271_03.009	Link file for PC (Microsoft FORTRAN)	7
IAEA1271_03.010	Executable code for PC (Lahey Fortran)	0
IAEA1271_03.011	Command procedure for test cases in PC	37
IAEA1271_03.012	Command procedure for test cases on VAX	47
IAEA1271_03.013	Command procedure for routing tests to batch	12
IAEA1271_03.014	Information provided by the author	202
IAEA1271_03.015	Lahey error messages	0
IAEA1271_03.016	CCCCCCCCCCCn difusion	126
IAEA1271_03.017	GNOMEX installation using MS Fortran	72
IAEA1271_03.018	Benchmark reference solution (test case-1)	13
IAEA1271_03.019	Test case-1 input (IAEA-2D benchmark)	37
IAEA1271_03.020	Cross sections for the IAEA-2D benchmark	8
IAEA1271_03.021	Test case-1 output on VAX	60
IAEA1271_03.022	Test case-1 output on PC (Lahey)	70
IAEA1271_03.023	Test case-2 input (IAEA-3D benchmark)	83
IAEA1271_03.024	Benchmark reference solution (test case-2)	175
IAEA1271_03.025	Test case-2 output on VAX	50
IAEA1271_03.026	Test case-2 output on PC (Lahey)	50
IAEA1271_03.027	BPR cell cross sections of assembly G08	20
IAEA1271_03.028	Control rod cell X sections of assembly G08	20
IAEA1271_03.029	Control rod cell X sections of assembly G08	20
IAEA1271_03.030	Fuel cell X sections of assembly G08	20
IAEA1271_03.031	Fuel cell X sections of assembly G08	20
IAEA1271_03.032	Fuel cell X sections of assembly G08	20
IAEA1271_03.033	Water cell X sections of assembly G08	20
IAEA1271_03.034	Water cell X sections of assembly G08	20
IAEA1271_03.035	Water cell X sections of assembly G08	20
IAEA1271_03.036	Test case-3 input (Assembly homogenization)	120
IAEA1271_03.037	Homogenized assembly cross sections (output)	6
IAEA1271_03.038	Test case-3 output on VAX	33
IAEA1271_03.039	Test case-3 output on PC (Lahey)	33
IAEA1271_03.040	Core cond. at which core X sect. are defined	370
IAEA1271_03.041	Unrodded core cross sections	740
IAEA1271_03.042	Core cond. at which control rod X sec def.	110
IAEA1271_03.043	Control rod cross sections	220
IAEA1271_03.044	Reflector cross sections	6
IAEA1271_03.045	Reactivity coefficient library	44
IAEA1271_03.046	Test case-4 input (PWR core with feddbacks)	20
IAEA1271_03.047	Auxiliary input reflective quadrant symmetry	122
IAEA1271_03.048	Auxiliary input cycling quadrant symmetry	150
IAEA1271_03.049	Output in Corlib format (reflective)	94
IAEA1271_03.050	Output in Corlib format (cyclic)	94
IAEA1271_03.051	Measured data for same configuration (ref)	11
IAEA1271_03.052	Test case-4 output on VAX	146
IAEA1271_03.053	Test case-4 output on PC (Lahey)	146
IAEA1271_03.054	Test case-5 input (Henry-Worley het. bench.)	46
IAEA1271_03.055	Reference solution by Koebke	29
IAEA1271_03.056	Output in CORlib format	5
IAEA1271_03.057	Test case-5 output on VAX	19
IAEA1271_03.058	Test case-5 output on PC (Lahey)	19
IAEA1271_03.059	DOS file-names	58

[ top ]

17. CATEGORIES

C. Static Design Studies

Keywords: coarse mesh, cross sections, diffusion equations, multigroup, power distribution, three-dimensional.