1. NAME AND TITLE

PALLAS-1D(VII): Multigroup Time-Independent Neutron Transport Code System for Plane or Spherical Geometry.

2. CONTRIBUTOR

Ship Research Institute, Tokyo, Japan.

3. CODING LANGUAGE AND COMPUTER

Fortran IV (C00380FM38000).

4. NATURE OF PROBLEM SOLVED

PALLAS-PL/SP solves multigroup time-independent one-dimensional neutron transport problems in plane or spherical geometry. The problems solved are subject to a variety of boundary conditions or a distributed source. General anisotropic scattering problems are treated for solving deep-penetration problems in which angle-dependent neutron spectra are calculated in detail.

5. METHOD OF SOLUTION

Energy dependence is treated by the multigroup approximation and angular dependence by a discrete ordinates approximation. A system of coupled one-group integral transport equations is calculated by performing a line integration along the neutron path in the direction of motion at each discrete ordinate direction. Scattering integral including anisotropic scattering is treated by a numerical integration. No iteration scheme is applied in the calculation. The resulting solutions are always physically reasonable and have no oscillating flux distributions sometimes found in discrete ordinates solutions.

6. RESTRICTIONS OR LIMITATIONS

The PALLAS-PL/SP program cannot treat thermal neutron transport problems. This code is also not appropriate for a mono-energy neutron transport problem.

7. TYPICAL RUNNING TIME

No study has been made by RSIC.

8. COMPUTER HARDWARE REQUIREMENTS

The code is operable on the FACOM computers. It requires 55 Kw core memories and a maximum of 1.041 Kw disk or drum memories in the case of a maximum of 120 energy groups, 300 spatial mesh points, 20 angular mesh points and 18 nuclei.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required.

10. REFERENCE

Kiyoshi Takeuchi and Shun-ichi Tanaka, "PALLAS-1D(VII) A Code for Direct Integration of Transport Equation in One-Dimensional Plane and Spherical Geometries," JAERI-M 84-214 (October 1984).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one DS/HD 3.5-in. (1.44 MB) diskette in self-extracting compressed DOS files which contains the source codes and sample problem input and output.

12. DATE OF ABSTRACT

February 1982, December 1986.