1. NAME AND TITLE

SECA: Evaluator of Angular Bounds for a Two-Dimensional Symmetric Gaussian Quadrature Set.

2. CONTRIBUTOR

Gibbs and Hill, Inc., New York, New York.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; IBM 360/370.

4. NATURE OF PROBLEM SOLVED

SECA calculates the azimuthal boundaries of the areas associated with the discrete directions of the Gaussian quadrature sets used in discrete ordinate calculations for R-Z and X-Y geometries.

5. METHOD OF SOLUTION

The method of computation is based on the numerical integration of the analytical expression for a differential azimuthal strip on a given polar band.

6. RESTRICTIONS OR LIMITATIONS

None noted. SECA is a small analysis routine intended to be run on a Load-and-Go basis.

7. TYPICAL RUNNING TIME

Compilation, linkage, and execution of a problem which calculated the azimuthal bounds for S₄, S₆, S₈, S₁₂, and S₁₆ quadrature sets ran in about two minutes using an IBM 360 compiler with Optimization = 2.

8. COMPUTER HARDWARE REQUIREMENTS

SECA is operable on the IBM 360/370 computers using standard equipment. Approximately 46 K of core storage is required. No tape drives are needed.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required.

10. REFERENCE

Roy A. Castelli and Ed Ochoa, "An Analytical Technique for Evaluating the Angular Bounds for a Two-Dimensional Symmetric Gaussian Quadrature Set," Informal paper (October 1976).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one (1.2MB) DOS diskette which contains the source code and sample problem input and output.

12. DATE OF ABSTRACT

March 1984.