1. NAME AND TITLE

BREESE-II: Auxiliary Routines for Implementing the Albedo Option in the MORSE Monte Carlo Code System.

AUXILIARY ROUTINES

MORSE: A General Purpose Monte Carlo Multigroup Neutron and Gamma-Ray Transport Code System with Combinatorial Geometry.

CARP-82: Multigroup Albedo Data using DOT Angular Flux Results.

BREESE is an acronym for Bechtel Reactor Edge Streaming Evaluator that was suggested by the third name of Samuel Finley Breese Morse.

2. CONTRIBUTORS

Bechtel Power Corporation, Gaithersburg, Maryland.

Oak Ridge National Laboratory, Oak Ridge, Tennessee. Science Applications, Inc., Oak Ridge, Tennessee.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; IBM 360/370, IBM 3033.

4. NATURE OF PROBLEM SOLVED

BREESE-II implements the albedo option of the random walk and associated estimation to detectors in the MORSE Monte Carlo code.

The first version of BREESE had a fixed number of outgoing polar angles and the number of outgoing azimuthal angles was a function of the value of the outgoing polar angle only. An examination of differential albedo data led to this modified version, BREESE-II, which allows the number of outgoing polar angles to be dependent upon the value of the incoming polar angle and the number of outgoing azimuthal angles to be a function of the value of both incoming and outgoing polar angles.

5. METHOD OF SOLUTION

BREESE-II implements the albedo option in MORSE by providing 1) replacements for the default routines ALBIN and ALBDO in MORSE, 2) an estimating routine, ALBDOE, compatible with the SAMBO package in MORSE, and 3) a separate program that writes a tape of albedo data in the proper format for ALBIN. The albedo data is a function of incident energy group, incident polar angle, and reflected energy group. Albedo routines perform the reflection and allow estimating contribution from the albedo point to the detector location.

6. RESTRICTIONS OR LIMITATIONS

CCC-203/MORSE-CG⁽¹⁾ is required as a basic MORSE source.

PSR-131/CARP must be run prior to BREESE-II to create an albedo data set to be used as input to BREESE-II.

7. TYPICAL RUNNING TIME

On the IBM 370/3033 computers, BREESE-II ran in 4 s and MORSE-CG ran in 4 min, 49 s.

8. COMPUTER HARDWARE REQUIREMENTS

BREESE-II is operable on the IBM 360/370 and 3033 computers. It required 270 K of storage. MORSE-CG requires 420 K of storage.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required. RSIC tested BREESE-II with a FORTH compiler.

10. REFERENCE

V. R. Cain and M. B. Emmett, "BREESE-II: Auxiliary Routines for Implementing the Albedo Option in the MORSE Monte Carlo Code," ORNL/TM-6807 (July 1979).

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; December 1984.

KEYWORDS: ALBEDO DATA PROCESSING; DATA PROCESSING, UTILITY; NEUTRON CROSS SECTION PROCESSING