1. NAME AND TITLE

MORSE-H: A Revised Version of the MORSE Monte Carlo Radiation Transport Code System. We recommend C00474/ALLCP/02 MORSE-CGA.

MORSE-H is a collection of useful options for use with MORSE codes.

2. CONTRIBUTOR

UKAEA AERE Harwell, Oxfordshire, England, via the OECD NEA Data Bank, Gif-sur-Yvette, Cedex, France.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; IBM 370/3033.

4. NATURE OF PROBLEM SOLVED

The original MORSE code (CCC-127/MORSE) was a multipurpose neutron and gamma-ray transport Monte Carlo code. It was designed as a tool for solving most shielding problems. Through the use of multigroup cross sections, the solution of neutron, gamma-ray, or coupled neutron-gamma-ray problems could be obtained in either the forward or adjoint mode. Time dependence for both shielding and criticality problems is provided. General three-dimensional geometry could be used with an albedo option available at any material surface. Isotropic or anisotropic scattering up to a P₁₆ expansion of the angular distribution was allowed.

CCC-203/MORSE-CG incorporated the Mathematical Applications, Inc. (MAGI) combinatorial geometry routines.

CCC-368/MORSE-B modified the Monte Carlo neutron and photon transport computer code MORSE-CG by adding routines which allow various flexible options.

MORSE-H is an attempt to bring together into one program the most commonly used options. This has been done by combining routines from MORSE-CG, some of them modified, with those of MORSE/B, also with some modification, and some additional routines. The routines of MORSE-B were, in turn, partly derived from modifications of routines from CCC-258/MORSE-E.

5. METHOD OF SOLUTION

Fluxes of neutrons or photons (or both in a coupled case) may be scored by either a next-event estimator, which provides the fluence at point detectors, or by a track-length estimator, which provides volume-integrated fluxes. In either case a restart option is available to enable a second or subsequent run to continue tracking particles in a case which was terminated for any reason.

The specification of a fixed source of particles is by up to 20 separate source regions of various geometric shapes, with particles born isotropically, monodirectional, or with directions in a defined code about the +z direction.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

Information not available at this time.

8. COMPUTER HARDWARE REQUIREMENTS

MORSE-H is operable on the IBM 370/3033 computers.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran H compiler is required.

10. REFERENCES

a. Included in documentation:

N. P. Taylor and J. Needham, "MORSE-H A Revised Version of the Monte Carlo Code MORSE," AERE-R 10432 (1982).

b. Background information:

M. B. Emmett, "The MORSE Monte Carlo Radiation Transport Code System," ORNL-4972 (February 1975).

C. Ponti and R. Van Heusden, "MORSE-E, A New Version of the MORSE Code," EUR5212e (1974).

N. P. Taylor, "MORSE-B A Revised Version of the Monte Carlo Code MORSE," University of Birmingham Dept. of Physics PN: 80-05, England (1980).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document (10.a) and one (1.2MB) DOS diskette which contains the source codes and sample problem input and output.

12. DATE OF ABSTRACT

September 1985; update January 1986.