NESC0631 RAFFLE2/MOD2

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

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 AUTHORS, MATERIAL, CATEGORIES

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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.