1. NAME AND TITLE

TRITAC: A Three-Dimensional Transport Code For Eigenvalue Problems Using The Diffusion Synthetic Acceleration Method

2. CONTRIBUTOR

Osaka University, Japan, through the NEA Data Bank, France.

3. CODING LANGUAGE AND COMPUTER

Fortran 77; VAX 8810, ACOS-100.

4. NATURE OF PROBLEM SOLVED

TRITAC is a three-dimensional discrete ordinates transport code for solving eigenvalue problems in reactor cores.

5. METHOD OF SOLUTION

Diffusion synthetic acceleration (DSA) is used in TRITAC to solve the eigenvalue problem in X-Y-Z geometry. DSA is applied not only to the inner iteration but also to the outer iteration. A seven-point difference scheme is used.

6. RESTRICTIONS OR LIMITATIONS

Variable dimensioning is used, so that the user can adjust the dimension of the container array according to the problem size.

7. TYPICAL RUNNING TIME

The sample input was tested at NEA Data Bank on a Vax 8810 computer. The total time was 20 CPU seconds.

8. COMPUTER HARDWARE REQUIREMENTS

TRITAC runs on the VAX 8810 and ACOS-100 computers.

9. COMPUTER SOFTWARE REQUIREMENTS

The code was written in Fortran 77. The NEA Data Bank used the VAX Fortran (version 5.0) under the VAX/VMS operating system.

10. REFERENCE

M. Bando, T. Yamamoto, Y. Saito, T. Takeda, "Three-Dimensional Transport Calculation Method for Eigenvalue Problems Using Diffusion Synthetic Acceleration," pp. 841-850 in Journal of Nuclear Science and Technology, 22[10], (October 1985) (as included in NEA 1087/01) (August 1986).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one (1.2 MB) DOS diskette.

12. DATE OF ABSTRACT

November 1990.