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NESC0631 RAFFLE2/MOD2

RAFFLE-2/MOD2, 3-D Steady-State Monte-Carlo Neutron Transport, Cell Averaged Scattering Cross-Sections Calculation

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1. NAME OR DESIGNATION OF PROGRAM:  RAFFLE2/MOD2
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2. COMPUTERS
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Program name Package id Status Status date
RAFFLE-2/MOD2 NESC0631/01 Tested 01-AUG-1979

Machines used:

Package ID Orig. computer Test computer
NESC0631/01 IBM 370 series IBM 370 series
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3. DESCRIPTION OF PROBLEM OR FUNCTION

RAFFLE is a three-dimensional general-purpose Monte Carlo program for the solution of static neutron transport problems. Either fission source iteration or external source problems can be solved. Reaction rates and fluxes or cell-averaged P0 and P1 transfer matrices can be obtained for up to  100 input energy groups. Multiplication factors, lifetimes, generation times, and probable errors are also computed. Groupwise currents from any region to adjacent regions can be computed. A zone geometry option, designated "mixed" zone geometry, is included to simplify the preparation of input data for problems having an array  of fuel pins. This option combines features of the rectangular, cylindrical r-z, and cylindrical r-theta-z zone geometries in a two-level zone search.
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4. METHOD OF SOLUTION

A Monte Carlo method is  used with options of
path type, ray type, or KENO scoring techniques.  Standard biasing
techniques  including weight,  reduction,  neutron splitting,  and
Russian roulette are available.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
   100 energy groups for editing
   200 surfaces
   400 regions
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6. TYPICAL RUNNING TIME

Running time is very problem dependent, but
often  1 to  2 hours  are required  on an  IBM360/75.  The  sample
problem requires 1 minute.
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7. UNUSUAL FEATURES OF THE PROGRAM

Features  include  the  combined
use of  multigroup and pointwise  cross sections, optional  use of
multigroup thermal  cross sections, and  the solution  of external
source problems.
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8. RELATED AND AUXILIARY PROGRAMS

The INCITE program (NESC Abstract
565) can be used to prepare  the multigroup thermal libraries used
by RAFFLE.
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9. STATUS
Package ID Status date Status
NESC0631/01 01-AUG-1979 Tested at NEADB
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10. REFERENCES

             RAFFLE2/MOD2 Notes, Aerojet Memorandum February 1976,
revised by ACC December 1976.
NESC0631/01, included references:
- RAFFLE2/MOD2 - ANC Notes (December 1976)
- W.E. Vesely et al.:
The RAFFLE General Purpose Monte Carlo Code
UC-32, ANCR-1022 (April 1973)
- R.S. Marsden et al.:
A Mixed Zone Geometry Option for the RAFFLE General Purpose Monte Carlo Code
UC-32, ANCR-1206 (February 1975)
- Miscellaneous Descriptive Notes
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11. MACHINE REQUIREMENTS:  570K bytes of memory
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0631/01 FORTRAN+ASSEMBLER
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:   OS/360,370.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

                 W. E. Vesely*, F. J. Wheeler, R. S. Marsden, and
                 D. E. Wessol
                 Idaho National Engineering Laboratory
                 EG&G Idaho, Inc.
                 P. O. Box 1625
                 Idaho Falls, Idaho  83401
*Present address-U. S. Nuclear Regulatory Commission
                 Washington, D.C.  20555
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16. MATERIAL AVAILABLE
NESC0631/01
File name File description Records
NESC0631_01.001 INFORMATIONS 8
NESC0631_01.002 SOURCE PROGRAM (F4,EBCDIC) 10448
NESC0631_01.003 SUBROUTINE PSICHI (ASSEMBLER) 207
NESC0631_01.004 SUBROUTINE IBCOM (ASSEMBLER) 2122
NESC0631_01.005 SUBROUTINE RANDR (ASSEMBLER) 75
NESC0631_01.006 SUBROUTINE TIME (ASSEMBLER) 84
NESC0631_01.007 SUBROUTINE DATE (ASSEMBLER) 66
NESC0631_01.008 THERMAL LIBRARY 2913
NESC0631_01.009 FAST LIBRARY 5900
NESC0631_01.010 SAMPLE INPUT DATA 308
NESC0631_01.011 SAMPLE OUTPUT 2382
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17. CATEGORIES
  • C. Static Design Studies

Keywords: Monte Carlo method, multiplication factors, neutron flux, reaction kinetics, reactivity, transport theory.