Computer Programs

NEA-1562 MICROX-2.

NEA-1562 MICROX-2.

MICROX-2, Group Constant Generator with Resonance Interference and Self-Shielding

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, METHODS, RESTRICTIONS, TYPICAL RUNNING TIME, FEATURES, RELATED OR AUXILIARY PROGRAMS, STATUS, REFERENCES, HARDWARE REQUIREMENTS, LANGUAGE, SOFTWARE REQUIREMENTS, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: MICROX-2

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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
MICROX-2	NEA-1562/02	Tested	24-MAY-2004

Machines used:

Package ID	Orig. computer	Test computer
NEA-1562/02	IBM PC,Linux-based PC	Linux-based PC,PC Windows

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3. DESCRIPTION OF PROGRAM OR FUNCTION

The MICROX-2 code prepares broad group neutron cross sections for use in diffusion- and/or transport-theory codes from an input library of fine group and pointwise cross sections. The MICROX-2 code can explicitly account for overlap and interference effects between resonances in both the
resonance and thermal neutron energy ranges and allows the simultaneous treatment of leakage and resonance self-shielding in doubly heterogeneous lattice cells.

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4. METHODS

The neutron weighting spectrum is obtained by solving the B1 neutron balance equations at about 10000 energies in a one- dimensional (planar, spherical or cylindrical), two-region unit cell. The regions are coupled by collision probabilities based upon spatially flat neutron emission. Energy dependent Dancoff factors and bucklings correct the one-dimensional cell calculations for multi- dimensional lattice effects. A critical buckling search option is also included. The inner region may include two different types of fuel particles (grains).

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

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6. TYPICAL RUNNING TIME

Many of the parameterized dimensions were changed to odd numbers to minimize memory access time on CRAY computers. - The vectorization is quite successful. For example, Ed. 13 running times with and with-out vectorisation for the TRX-1 CSEWG benchmark using 193 group JEF-1 data are given. The cft77 version 3.1 FORTRAN compiler on the ETHZ CRAY-X/MP28 computer was used. An average 0.385 megawords was used.
On PC it took a few seconds.

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7. UNUSUAL FEATURES

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8. RELATED OR AUXILIARY PROGRAMS

The package contains the MICROR NJOY compatible module. It is a reformatting module that produces cross-sections library files for the MICROX-2 and MICROBURN postprocessor codes. Using the data on the pointwise and groupwise NJOY tapes, MICROR produces the tapes containing basic nuclear data, FDTAPE, GAR and GGTAPE used by two-region spectrum codes MICROX and MICROX-2 and by two-region spectrum burn-up code MICROBURN.

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9. STATUS

Package ID	Status date	Status
NEA-1562/02	24-MAY-2004	Tested at NEADB

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10. REFERENCES

NEA-1562/02, included references:

- D. Mathews
An Improved Version of the MICROX-2 Code"
PSI Bericht Nr. 97-11 (November 1997)
- D. Mathews
Appendices B to E of PSI-Report No. 97-11 "An Improved Version of the MICROX-2
TM-41-97-17 (November 1997)
- D.R. Mathews, J. Stepanek, S Pelloni, C.E. Higgs
The NJOY Nuclear Data Processing System: The MICROR Module
EIR-Beiricht Nr. 539 (December 1984)

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11. HARDWARE REQUIREMENTS

The PSI version of the MICROX-2 code operates on the CRAY J90 and CRAY-Y/MP computers using the UNICOS 9 operating system and the f90 FORTRAN compiler, as well as on an IBM PC with the Lahey LF90 FORTRAN compiler.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-1562/02	FORTRAN-90, FORTRAN-95

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13. SOFTWARE REQUIREMENTS: MICROX-2 runs under UNICOS and DOS operating systems

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

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15. NAME AND ESTABLISHMENT OF AUTHORS

                D. Mathews
                Paul Scherrer Institut
                CH - 5232 Villigen PSI
                SWITZERLAND

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16. MATERIAL AVAILABLE

NEA-1562/02

README.TXT Installation instructions
/data/gendfc/ DOS procedure and data files
/data/libraries/ Data files
/data/pendfc/ DOS procedure and data files
/doc/ PDF documentation
/outputs/micror/ Test outputs
/outputs/microx2/ Test outputs
/runs/ linux scripts and DOS procedures
/source/ Makefile (linux only) and MICROR and MICROX-2 Fortran sources
readme.now Information file

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17. CATEGORIES

B. Spectrum Calculations, Generation of Group Constants and Cell Problems

Keywords: group constants, leakage, neutron cross sections, resonance absorption, self-shielding.