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

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Program name | Package id | Status | Status date |
---|---|---|---|

DANCOFF-MC | NEA-1516/02 | Tested | 06-JAN-2003 |

Machines used:

Package ID | Orig. computer | Test computer |
---|---|---|

NEA-1516/02 | UNIX W.S.,IBM PC | PC Windows |

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3. DESCRIPTION OF PROGRAM OR FUNCTION

DANCOFF-MC program was designed to calculate, by Monte Carlo method, the Dancoff factor which is used to determine the flux reduction in resonance integral calculations. DANCOFF-MC allows almost arbitrary arrangement of cylindrical or spherical fuel elements: different fuel region diameters, clads and gaps with different sizes, annular rods, arbitrary positions of rods or spherical pellets, and different macroscopic cross sections for each fuel element and its clad are all permitted. Optionally, it is also possible to calculate the Dancoff factor in a lattice of "grey", i.e., partially transparent, fuel lumps.

DANCOFF-MC program was designed to calculate, by Monte Carlo method, the Dancoff factor which is used to determine the flux reduction in resonance integral calculations. DANCOFF-MC allows almost arbitrary arrangement of cylindrical or spherical fuel elements: different fuel region diameters, clads and gaps with different sizes, annular rods, arbitrary positions of rods or spherical pellets, and different macroscopic cross sections for each fuel element and its clad are all permitted. Optionally, it is also possible to calculate the Dancoff factor in a lattice of "grey", i.e., partially transparent, fuel lumps.

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4. METHOD OF SOLUTION

Calculation of Dancoff factors is based on its collision probability definition. The program calculates the probability that a neutron emitted isotropically from the surface of the fuel region of the fuel element under consideration will have its next collision in the fuel region of any other surrounding fuel element. This probability is calculated by Monte Carlo method which is equally applicable in simple and in complicated geometries. Using the Monte Carlo method in the case of DANCOFF-MC means to select randomly the position where the neutron is emitted and the direction in which it travels. The lengths traveled in different material regions and the transport probabilities along any given path are calculated according to analytical formulae.

Calculation of Dancoff factors is based on its collision probability definition. The program calculates the probability that a neutron emitted isotropically from the surface of the fuel region of the fuel element under consideration will have its next collision in the fuel region of any other surrounding fuel element. This probability is calculated by Monte Carlo method which is equally applicable in simple and in complicated geometries. Using the Monte Carlo method in the case of DANCOFF-MC means to select randomly the position where the neutron is emitted and the direction in which it travels. The lengths traveled in different material regions and the transport probabilities along any given path are calculated according to analytical formulae.

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6. TYPICAL RUNNING TIME

Being a Monte Carlo calculation, the running time depends on the required accuracy. The calculation of one Dancoff factor with 100,000 histories, providing typically a statistical accuracy not worse than 0.001, takes 3 to 10 s on a DEC AXP 3000/400 computer and 50 to 60 s on a 66 MHz 486 PC if the number of surrounding lumps taken into account lies in the range between 20 to 40.

Being a Monte Carlo calculation, the running time depends on the required accuracy. The calculation of one Dancoff factor with 100,000 histories, providing typically a statistical accuracy not worse than 0.001, takes 3 to 10 s on a DEC AXP 3000/400 computer and 50 to 60 s on a 66 MHz 486 PC if the number of surrounding lumps taken into account lies in the range between 20 to 40.

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10. REFERENCES

- S. Feher et al.:

Monte Carlo Calculation of Dancoff Factors in Irregular Geometries

Nucl. Sci. Eng. 117, 227-238 (1994)

- S. Feher et al.:

Monte Carlo Calculation of Dancoff Factors in Irregular Geometries

Nucl. Sci. Eng. 117, 227-238 (1994)

NEA-1516/02, included references:

- S. Feher and P.F.A. de Leege:DANCOFF-MC - A Computer Program for Monte Carlo Calculation

of Dancoff Factors in Irregular Geometries

IRI-131-95-003 (June 1997)

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11. MACHINE REQUIREMENTS

DANCOFF-MC runs on DEC AXP, IBM RISC/6000, and IBM 486 personal computers. The main storage (RAM) requirement depends on the number of neighbouring lumps taken into account. Typical problems need 500 Kbytes of main storage.

NEA 1516/01: The NEA Data Bank compiled and ran the program on the following computers: (1)DEC VAX 4000; (2)DEC ALPHA 200-4/166; (3)PC DELL Optiplex GXi with Pentium 166MHz and 32MB of RAM; (4)HP 9000/7xx; (5)IBM RISC/6000; (6)SUN SPARC sun4u.

DANCOFF-MC runs on DEC AXP, IBM RISC/6000, and IBM 486 personal computers. The main storage (RAM) requirement depends on the number of neighbouring lumps taken into account. Typical problems need 500 Kbytes of main storage.

NEA 1516/01: The NEA Data Bank compiled and ran the program on the following computers: (1)DEC VAX 4000; (2)DEC ALPHA 200-4/166; (3)PC DELL Optiplex GXi with Pentium 166MHz and 32MB of RAM; (4)HP 9000/7xx; (5)IBM RISC/6000; (6)SUN SPARC sun4u.

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

DEC Open VMS Version 6.1 on DEC AXP, S-DOS 6.2 on IBM 486 PC, and IBM AIX Version 3.2 on IBM RISC/6000.

NEA 1516/01: The tests at the NEA Data Bank were performed on the different computers under the following respective platforms: (1) OpenVMS 6.1; (2) OSF1 3.2 62 (DEC UNIX); (3) Windows NT 4.0 (MSDOS window); (4) HP-UX 0.05 & HP-UX 10.20; (5) AIX V4 R1; (6) Solaris 2.0 (SunOS 5.5.1). The following respective compilers were used to compile the source codes: (1) DEC/VMS FORTRAN; (2) DEC FORTRAN f77 and f90; (3) Lahey Fortran 90 V3.5 and MS-FORTRAN Powerstation 4.0; (4) HP f77 Rel. 10.0; (5) IBM f77 (xlf); (6) SUN f77 and f90.

DEC Open VMS Version 6.1 on DEC AXP, S-DOS 6.2 on IBM 486 PC, and IBM AIX Version 3.2 on IBM RISC/6000.

NEA 1516/01: The tests at the NEA Data Bank were performed on the different computers under the following respective platforms: (1) OpenVMS 6.1; (2) OSF1 3.2 62 (DEC UNIX); (3) Windows NT 4.0 (MSDOS window); (4) HP-UX 0.05 & HP-UX 10.20; (5) AIX V4 R1; (6) Solaris 2.0 (SunOS 5.5.1). The following respective compilers were used to compile the source codes: (1) DEC/VMS FORTRAN; (2) DEC FORTRAN f77 and f90; (3) Lahey Fortran 90 V3.5 and MS-FORTRAN Powerstation 4.0; (4) HP f77 Rel. 10.0; (5) IBM f77 (xlf); (6) SUN f77 and f90.

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NEA-1516/02

PACKING.LST Packing listDCMCDOC.PDF Dancoff-MC User Manual

README.TXT Description of installation and changes

DCIM_F90.EXE PC executable for DCMCI

DC37_F90.EXE PC executable for DCMC37

DCIM_F90.FOR Complete program source DCMCI

DC37_F90.FOR Complete program source DCMC37

DC_I_F90.FOR Subroutine to calculate regular (infinite) lattices

DCMC_F90.FOR Nucleus subroutine of the Dancoff-MC method

DCIS_F90.FOR Subrout. to make the subrout. DCMCI callable from SCALE sys.

SMPI1.INP Sample input 1 for the program DCMCI

SMPI1.OUT Sample output for SMPI1.INP

SMPI2.INP Sample input 2 for the program DCMCI

SMPI2.OUT Sample output for SMPI2.INP

SMPI3.INP Sample input 3 for the program DCMCI

SMPI3.OUT Sample output for SMPI3.INP

SMPI4.INP Sample input 4 for the program DCMCI

SMPI4.OUT Sample output for SMPI4.INP

SMP371.INP Sample input 1 for the program DCMC37

SMP371.OUT Sample output for SMP371.INP

SMP372.INP Sample input 2 for the program DCMC37

SMP372.OUT Sample output for SMP372.INP

dcmcim Script to run the main program DCIM_F90 on UNIX

dcmc37 Script to run the main program DC37_F90 on UNIX

runall Script to run all sample problems on UNIX

DCMCIM.BAT Script to run the main program DCIM_F90 on PC

DCMC37.BAT Script to run the main program DC37_F90 on PC

RUNALL.BAT Script to run all sample problems on PC

Keywords: Dancoff correction, Monte Carlo method, reactor lattices, resonance integrals.