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PSR-0142 MORSEC-SP.

MORSEC-SP, Step Function Angular Distribution for Cross-Sections Calculation by Program MORSE

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES
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1. NAME OR DESIGNATION OF PROGRAM:  MORSEC-SP.
Incorporation of a Step Function Angular Distribution Option in the  MORSEC Cross Section Module.
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2. COMPUTERS
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Program name Package id Status Status date
MORSEC-SP PSR-0142/01 Tested 17-SEP-1980

Machines used:

Package ID Orig. computer Test computer
PSR-0142/01 CDC 7600 CDC 7600
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3. DESCRIPTION OF PROBLEM OR FUNCTION

MORSEC-SP allows one to utilize a step distribution to describe the angular dependence of the multi- group function in the MORSEC cross section module of the MORSE Monte Carlo code. The step distribution is always non-negative and may be  used in the random walk and for making point detector estimators.
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4. METHOD OF SOLUTION

MORSEC-SP 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 calculation using the converted moments from the given Legendre coefficients of the scattering distributions.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Additional coding to the MORSEC module is variable dimensional and fully incorporated into blank common.
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6. TYPICAL RUNNING TIME

An XCHEKR evaluation of a 58 group hydrogen cross section set from the DNA cross section library took 19 CP seconds on a CDC 6600.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
PSR-0142/01 17-SEP-1980 Tested at NEADB
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10. REFERENCES

- Nelson De Gangi,
"Order of Scattering Calculations of Photon and Neutron Transport"    Ph.D. Thesis, University of Maryland, (1977).
- Nelson De Gangi and Frank Munno,
  "MORSEC-SP: A Multigroup Step Function Angular Dependence Option
   in MORSEC",
  (to be published).
- Nelson De Gangi and Frank Munno,
  "Photon First Collision Fluxes: Further Validation of MERSEC-SP",
  (to be published).
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11. MACHINE REQUIREMENTS

MORSEC-SP has been placed on the UNIVAC 1108  and CDC 6600. Standard hardware equipment is used with standard I-O  devices required.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
PSR-0142/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  Standard software may be used.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHOR

University of Maryland
Nuclear Engineering
College Park, Maryland 20742
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16. MATERIAL AVAILABLE
PSR-0142/01
File name File description Records
PSR0142_01.001 SOURCE 3174
PSR0142_01.002 SAMPLE INPUT DATA 7
PSR0142_01.003 SAMPLE OUTPUT 1857
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17. CATEGORIES
  • B. Spectrum Calculations, Generation of Group Constants and Cell Problems

Keywords: Monte Carlo method, angular distribution, cross sections, multigroup, transfer functions.