NEA-1426 SIXTUS-3.

1. NAME OR DESIGNATION OF PROGRAM:  SIXTUS-3.

3. DESCRIPTION OF PROGRAM OR FUNCTION

Three-dimensional, nodal, neutron diffusion theory criticality code in hexagonal geometry.

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.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Number of materials  should not exceed 255; however, this restriction can be easily removed.

6. TYPICAL RUNNING TIME:

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.

7. UNUSUAL FEATURES OF THE PROGRAM:  Only criticality problems can be handled.

8. RELATED AND AUXILIARY PROGRAMS:  A two-dimensional program SIXTUS-2.

10. 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).

11. MACHINE REQUIREMENTS

A typical problem may need 20 kB to 1 MB for  a container master array.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  VMS, UNIX.

NEA-DB ran the program under UNICOS 7.0.4.

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.

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

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