1. NAME AND TITLE

TPTRIA: A Computer Program for the Reactivity and Kinetic Parameters for Two-Dimensional Triangular Geometry by Transport Perturbation Theory

AUXILIARY ROUTINES

DIAMANT2 A discrete ordinates code to calculate direct and adjoint angular flux.

2. CONTRIBUTOR

Kernforschungszentrum Karlsruhe GmbH, Karlsruhe, Germany

3. CODING LANGUAGE AND COMPUTER

Fortran 77, ASSEMBLER; IBM 3083.

4. NATURE OF PROBLEM SOLVED

TPTRIA calculates reactivity, effective delayed neutron fractions and mean generation time for two-dimensional triangular geometry on the basis of neutron transport perturbation theory.

DIAMANT2 (also designated as CCC-414), is a multigroup two-dimensional discrete ordinates transport code system for triangular and hexagonal geometry which calculates direct and adjoint angular fluxes.

5. METHOD OF SOLUTION

DIAMANT2 is run to produce group cross sections, microscopic data of delayed neutron fractions and spectra, isotope dependent prompt neutron fission spectrum, and direct and adjoint angular fluxes. These are then the input to TPTRIA which computes reactivity by perturbation theory. TPTRIA has two main options: exact perturbation calculation of reactivity, where the direct and adjoint angular fluxes are used for unperturbed and perturbed systems, respectively; the other option is first order perturbation calculations of probe reactivity where unperturbed angular fluxes are used.

6. RESTRICTIONS OR LIMITATIONS

Only two-dimensional regular triangular geometry is considered. There is no restriction on the number of energy groups. At present only down scatter and an Sn approximation up to n=8 are allowed.

7. TYPICAL RUNNING TIME

First order perturbation with S2, 4 energy groups, 3 probe samples for a mesh grid of 30x15 triangles took .11 second on a SIEMENS 7890 computer.

Exact perturbation calculation with S2, 4 energy groups for a mesh grid consisting of 30x15 triangles took .5 second on the SIEMENS 7890.

On an IBM 3083, using the sample case in the package, DIAMANT2 took about 9.48 seconds; TPTRIA took 2.18 seconds.

8. COMPUTER HARDWARE REQUIREMENTS

IBM 3083, SIEMENS 7890.

1516 kb of main storage for DIAMANT2.

576 kb of main storage for TPTRIA.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran 77 compiler is required under the MVS operating system.

10. REFERENCE

K. Kobayashi, G. Buckel, K. Kufner, "TPTRIA, A Computer Program For the Reactivity and Kinetic Parameters For Two-dimensional Triangular Geometry by Transport Perturbation Theory," KfK 4116 (October 1986).

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

October 1990.