1. NAME AND TITLE

MORSEC-SP2: A Multigroup Cross Section Module for the MORSE Monte Carlo Computer Code System.

AUXILIARY ROUTINE

SBIN: Converts sample problem CASK (22N, 18G) cross sections for H and O to binary format.

This version of MORSE-SP2 is a revision of MORSEC-SP and incorporates reduced storage requirements for complex multimedia problems and flexibility in retaining elemental cross section angular data when describing elemental mixtures.

2. CONTRIBUTOR

United Engineers and Constructors Inc., Philadelphia, Pennsylvania.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; Honeywell 66/60.

4. NATURE OF PROBLEM SOLVED

MORSEC-SP2 is a cross section processing/interface module for the MORSE Monte Carlo computer code. It allows the angular dependence of the multigroup transfer function to be represented with discrete, step and truncated Legender polynomial distributions. The step distribution is always non-negative and may be used in the random walk and for making point detector estimators. This version of MORSEC-SP provides an expanded cross section mixing capability.

5. METHOD OF SOLUTION

MORSEC-SP2 utilizes a table look up procedure to provide the probability of scattering when making point detector estimates for a given incident energy group and scattering angle. In the random walk, the step distributions are converted to cumulative distributions and an angle of scatter is selected from the cumulative distributions. Step distributions are obtained from calculations using the converted moments from the given Legendre coefficients of the scattering distributions.

6. RESTRICTIONS OR LIMITATIONS

Limitations on individual input parameters are detailed in the user's manual.

7. TYPICAL RUNNING TIME

Computer run times are comparable to run times using the MORSEC and MORSEC-SP cross section modules.

8. COMPUTER HARDWARE REQUIREMENTS

MORSEC-SP2 is operable on the Honeywell 66/60.

9. COMPUTER SOFTWARE REQUIREMENTS

MORSEC-SP2 was run under the GCOS3 operating system. A Fortran IV compiler is required.

10. REFERENCES

N. De Gangi, "A Multigroup Cross Section Module for the MORSE Monte Carlo Computer Code" NU-588 (November 1983).

N. De Gangi and F. Munno, "MORSEC-SP: Incorporation of a Step Function Angular Distribution Option in the MORSEC Cross Section Module," UM-1017 (1979).

N. De Gangi and F. Munno, "MORSEC-SP: A Multigroup Step Function Angular Dependence Option in Morsec," (Summary paper to be published.)

N. De Gangi and F. Munno, "Photon First Collision Fluxes: Further Validation of MORSEC-SP," (Summary paper to be published.)

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

January 1984.