1. NAME AND TITLE

STERNO: Two Dimensional Gamma-Ray Heating Kernel Integration Code.

AUXILIARY ROUTINE

B552: Cross Section Library Tape Generator.

Incorporated in STERNO is GAMHEAT, a modified version of ORNL's heat generation code, 2DGH. The technology dates to the 1960s. It was distributed by RSIC five times between 19641973.

2. CONTRIBUTOR

Pratt and Whitney Aircraft, CANEL, Middletown, Connecticut.

3. CODING LANGUAGE AND COMPUTER

FORTRAN 63; CDC 1604.

4. NATURE OF PROBLEM SOLVED

The STERNO code calculates the gamma-ray heating rate due to gamma-ray producing neutron reactions for geometry with cylindrical symmetry.

5. METHOD OF SOLUTION

The code uses microscopic photon production cross sections, material densities, and TDC neutron fluxes to generate the volume distributed photon sources. The point kernel approximation to the volume distributed source is used to calculate the photon contribution at a given mesh point. A correction factor is applied to the point source approximation for sources in the immediate vicinity of the mesh point. An equivalent buildup factor is calculated using an empirical method. The heating calculation is performed using a substantially modified version of the 2DGH code.

6. RESTRICTIONS OR LIMITATIONS

The code can accommodate a maximum of: 18 neutron-energy groups, 8 gamma-ray energy groups, 2100 mesh points, 30 materials, and 50 regions.

7. TYPICAL RUNNING TIME

Estimated time to run the sample problem: cross section generation, 27 seconds; problem, 8 minutes, 47 seconds.

8. COMPUTER HARDWARE REQUIREMENTS

The code is designed for a 32 K computer with seven tape units.

9. COMPUTER SOFTWARE REQUIREMENTS

The code is written in FORTRAN 63 for the CDC 1604 COOP Monitor System. Input, output, system, 3 scratch, and the library tape assignments are made.

10. REFERENCE

C. E. Keller, "STERNO - A Two-Dimensional Gamma-Ray Heating Code," Pratt & Whitney Aircraft TIM No. 829 (October 1964).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one (1.2MB) DOS diskette which contains the source codes, a cross section library, and sample problem input and output.

12. DATE OF ABSTRACT

July 1967; updated July 1981, February 1985.