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NEA-1426 SIXTUS-3.

SIXTUS-3, 3-D Nodal Neutron Diffusion Criticality in Hexagonal Geometry

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1. NAME OR DESIGNATION OF PROGRAM:  SIXTUS-3.
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2. COMPUTERS
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Program name Package id Status Status date
SIXTUS-3 NEA-1426/01 Tested 01-DEC-1993

Machines used:

Package ID Orig. computer Test computer
NEA-1426/01 Many Computers CRAY Y-MP
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3. DESCRIPTION OF PROGRAM OR FUNCTION

Three-dimensional, nodal, neutron diffusion theory criticality code in hexagonal geometry.
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4. METHOD OF SOLUTION

Intranodal elementary solutions with an exact multigroup eigenvalue spectrum are spanned on two irreducible symmetry bases for the C6 and C2 groups of rotations for lateral and axial components, respectively. They represent a general homogeneous solution which is augmented with the special heterogeneous one determined by the transversal leakage terms, and from it the multigroup nodal response matrix for the partial current symmetry components on the node interfaces is computed. The response of a node to the incoming current is propagated in the system in a node sweeping process and after a prescribed number of sweeps the multiplication factor and the response matrix is recalculated. The iterations are terminated when the criteria of convergence for the multiplication factor, fission source and flux are met. An acceleration algorithm based on a special version of the Lyusternyk-Wagner extrapolation scheme is employed. The program contains a number of EISPACK routines.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Number of materials  should not exceed 255; however, this restriction can be easily removed.
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6. TYPICAL RUNNING TIME:
NEA-1426/01
NEA-DB ran the test cases included in this package on a Cray-YMP computer. The following CPU times were found:
case 1 - 100sec; case 2 - 50sec; case 3 - 882sec.
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7. UNUSUAL FEATURES OF THE PROGRAM:  Only criticality problems can be handled.
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8. RELATED AND AUXILIARY PROGRAMS:  A two-dimensional program SIXTUS-2.
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9. STATUS
Package ID Status date Status
NEA-1426/01 01-DEC-1993 Tested at NEADB
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10. REFERENCES:
NEA-1426/01, included references:
- J.J. Arkuszewski:
  SIXTUS-3.0 Primer
  TM-40-90-06/Rev. (November 1, 1991).
- J.J. Arkuszewski, Y. Kawagoe and T. Takeda:
  SIXTUS-3: A Three Dimensional Nodal Diffusion Code in Hex-Z
  Geometry
  Preprint from PSI-Bericht Nr. 102 (1991).
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11. MACHINE REQUIREMENTS

A typical problem may need 20 kB to 1 MB for  a container master array.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-1426/01 FORTRAN
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  VMS, UNIX.
NEA-1426/01
NEA-DB ran the program under UNICOS 7.0.4.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

The
program is designed to be executed in an interactive mode and is expected to run on any UNIX platform.
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15. NAME AND ESTABLISHMENT OF AUTHORS

          Jacek J. Arkuszewski
          Paul Scherrer Institute 106/22
          CH-5232 Villigen-PSI, Switzerland

          T. Takeda, Y. Kawago
          Osaka University
          Dept. of Nuclear Engineering
          Faculty of Engineering
          2-1 Yamada Oka, Suita Osaka 565, Japan
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16. MATERIAL AVAILABLE
NEA-1426/01
File name File description Records
NEA1426_01.001 Information file 63
NEA1426_01.002 JCL for sample run 12
NEA1426_01.003 LOG file of sample run 296
NEA1426_01.004 SIXTUS.SSS SIXTUS-3 UPDATE compatible source 5558
NEA1426_01.005 Sample problem input 1 63
NEA1426_01.006 Sample problem input 2 23
NEA1426_01.007 PROTEUS Sample problem input 3 253
NEA1426_01.008 XSSNR XSEC file for sample problem 2 50
NEA1426_01.009 OUTVVER Sample problem 1 output 3610
NEA1426_01.010 OUTSNR Sample problem 2 output 1545
NEA1426_01.011 OUTSNR-OR Sample problem 2 output (author) 2801
NEA1426_01.012 OUTPROT Sample problem 3 output 1675
NEA1426_01.013 Computer program abstract (author) 1316
NEA1426_01.014 SIXTUS-3 basic theory description (author) 7657
NEA1426_01.015 SIXTUS-3 primer (author) 6481
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17. CATEGORIES
  • C. Static Design Studies

Keywords: diffusion equations, hexagonal configuration, multigroup theory, three-dimensional.