1. NAME AND TITLE

BALTORO: Code for Coupling of Monte Carlo and Discrete Ordinates Radiation Transport Calculations.

2. CONTRIBUTOR

Institute of Nuclear Physics, Krakow, Poland.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; CDC 6600.

4. NATURE OF PROBLEM SOLVED

BALTORO uses the external coupling of neutron and gamma radiation transport data obtained from the three-dimensional MORSE Monte Carlo code and the one-dimensional discrete ordinates ANISN code to find the numerical solutions to problems involving (a) the quantity of a radiation-induced nuclear effect occurring in a neutron field in an infinite homogeneous medium perturbed by a complex object containing a radiation source and (b) the score from a radiation yielding nuclear effect occurring in a neutron field in an infinite homogeneous medium perturbed by a complex object containing a radiation detector.

5. METHOD OF SOLUTION

The unperturbed (UN) approximation, the adjoint difference (AD) approximation (volume coupling), and the surface integral (SI) approximation (boundary coupling) are calculated for problems of type (a) or (b). The multigroup approximation for the energy dependence and the PLSN approximation for the angular dependence are applied.

6. RESTRICTIONS OR LIMITATIONS

The core size, depending upon the problem, is limited only by the computer available.

A matrix medium should be the infinite homogeneous medium. The probe geometry and the source or detector energy spectrum must be modeled by the Monte Carlo package. A user-chosen isotropic effect that is not affecting the transport process can be considered with no time dependence at points not too close to the perturbed region.

7. TYPICAL RUNNING TIME

On the CDC 6600 computer with direct access mass storage, several to a few hundred central processor seconds may be required depending upon the number of groups and space mesh points, orders of approximation, number of histories analyzed, and number of points and energetic responses given.

8. COMPUTER HARDWARE REQUIREMENTS

BALTORO requires the CDC computer with the large core device or at least with the direct-addressable disks.

9. COMPUTER SOFTWARE REQUIREMENTS

The CYBER version of BALTORO operates under the SCOPE 3.4 system with the FTN compiler. The CERNCOMPUTER Library routine MEMORY for dynamic reservation of the COMMON field and the system-library mass storage INPUT/OUTPUT routines (OPENMS, WRITMS, READMS, AND CLOSMS) for a record-addressable file have been used and may be replaced in a different system.

10. REFERENCE

J. M. Zazula, "BALTORO - A General Purpose Code for Coupling Discrete Ordinates and Monte-Carlo Radiation Transport Calculations," Report No. 1228/AP (1983).

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

January 1986.