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NESC0185 GAMTEC2

GAMTEC-2, MultiGroup Constant for Homogeneous or Heterogeneous Core

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1. NAME OR DESIGNATION OF PROGRAM:  GAMTEC2
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2. COMPUTERS
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Program name Package id Status Status date
GAMTEC-2 NESC0185/01 Tested 01-FEB-1977
GAMTEC-2 NESC0185/02 Tested 01-OCT-1969

Machines used:

Package ID Orig. computer Test computer
NESC0185/01 CDC CYBER 174 CDC CYBER 174
NESC0185/02 IBM 360 series IBM 360 series
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3. DESCRIPTION OF PROBLEM OR FUNCTION

GAMTEC2 generates  multigroup
constants  in  the energy  range  from  0  to  10 MeV  for  either
homogeneous  mixtures   or  heterogeneous  arrays   consisting  of
cylinderized  lattice  cells.   The thermal  group  constants  are
averaged  over (1)  Wigner-Wilkins light  moderator spectrum,  (2)
Wilkins   heavy   moderator   spectrum,  or   (3)   a   Maxwellian
distribution.  For  heterogeneous arrays the spatial  thermal flux
is calculated by a monoenergetic P3 approximation.  For epithermal
energies, the slowing-down  distribution is described by  either a
B1  or P1  approximation  to  the Boltzmann  equation.   Resonance
absorption and fission  are treated by the  Adler-Nordheim method.
An  improved method  over  that used  in  GAM1  for averaging  the
resonance absorption  contribution to the multigroup  constants is
included.  Fuel  lumping effects on the  fast fission of  U238 and
Th232 are treated by an  n-flight collision probability technique.
Group constants are  punched on cards in HFN  (diffusion code) and
DTF (SN transport code) formats.
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4. METHOD OF SOLUTION:
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The maximum number
of concentric regions in the unit lattice cell is 16.  Each region
may contain  up to 10 isotopes.   Group constants may  be computed
for one thermal group and from 1 to 34 epithermal groups.
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6. TYPICAL RUNNING TIME:  20 to 25 seconds on the CDC6400.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS

GAMTEC2   combines  the   Atomics
International TEMPEST  (NESC Abstract 50)  and the  General Atomic
GAM1 codes  to compute multigroup  constants for both  thermal and
epithermal  neutrons  in  one  operation.   The  original  IBM7090
version was prepared by L. L. Carter  and C. R. Richey of Battelle
Pacific  Northwest Laboratories,  Richland, Washington  and C.  E.
Hughey of General Electric Company, Richland, Washington.
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9. STATUS
Package ID Status date Status
NESC0185/01 01-FEB-1977 Tested at NEADB
NESC0185/02 01-OCT-1969 Tested at NEADB
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10. REFERENCES

- R. L. Brunnenmeyer and R. A. Mickle,
  GAMTEC-II GE-625 ,Version (NE572) User's Notes
  Bechtel Note, July 1968.
NESC0185/01, included references:
- L.L. Carter, C.R. Richey and C.E. Hughey:
  GAMTEC-II, A Code for Generating Consistent Multigroup Constants
  Utilized in Diffusion and Transport Theory Calculations
  BNWL-35 (May 1965) and Errata.
- Note to the Users of the 7090 Version of GAMTEC-II
- Argonne Code Center Programming Note 70-18
  (11-5-60).
- Argonne Code Center Programming Note 70-20
  (1-22-70).
- Argonne Code Center Programming Notes GAMTEC-II Program
NESC0185/02, included references:
- L.L. Carter, C.R. Richey and C.E. Hughey:
  GAMTEC-II, A Code for Generating Consistent Multigroup Constants
  Utilized in Diffusion and Transport Theory Calculations
  BNWL-35 (May 1965) and Errata.
- Note to the Users of the 7090 Version of GAMTEC-II
- Argonne Code Center Programming Note 70-18
  (11-5-60).
- Argonne Code Center Programming Note 70-20
  (1-22-70).
- Argonne Code Center Programming Notes GAMTEC-II Program
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11. MACHINE REQUIREMENTS

The code requires  the use of 2  tape units
in addition  to the  usual input and  output units  - one  for the
single data library tape and one  for temporary storage.  Also, an
on-line card  punch or  tape for  punch output  is required.   The
CDC6400 version uses disk as scratch storage.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0185/01 FORTRAN-IV
NESC0185/02 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:            EXEC2
(UNIVAC1107) and SCOPE 3.4 (CDC6400).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

   The
GE625 version  has been modified  to incorporate a  simple routine
for calculating Dancoff correction factors  and to provide punched
output for FOG  (NESC Abstract 28).  The  CDC6400 version requires
the RUN compiler.
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15. NAME AND ESTABLISHMENT OF AUTHORS

   1107          L. L. Carter and C. R. Richey
                 Pacific Northwest Laboratories
                 Battelle
                 P. O. Box 999
                 Richland, Washington  99352
   1107          C. E. Hughey
                 General Electric Company
                 Richland, Washington  99352
   625           R. L. Brunnenmeyer and R. A. Mickle
                 Bechtel Corporation
                 50 Beale Street
                 San Francisco, California  94119
   6400          R. A. Rydin
                 Nuclear Engineering Department
                 University of Virginia
                 Charlottesville, Virginia  22901
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16. MATERIAL AVAILABLE
NESC0185/01
File name File description Records
NESC0185_01.001 SOURCE - FORTRAN 6349
NESC0185_01.002 SAMPLE PROBLEM DATA 19
NESC0185_01.003 SAMPLE PROBLEM PRINTED OUTPUT 819
NESC0185_01.004 'COPYBCD' AUXILIARY PROGRAM 334
NESC0185_01.005 INPUT TO COPYBCD (LIBRARY DATA) 12398
NESC0185_01.006 PRINTED OUTPUT FROM COPYBCD 16825
NESC0185/02
File name File description Records
NESC0185_02.001 GAMTEC-2 SOURCE & DATA IBM 360 7343
NESC0185_02.002 GAMTEC-2 UPDATED SOURCE & DATA 755
NESC0185_02.003 LIBRARY EDITING PROGRAM SOURCE 99
NESC0185_02.004 LIBRARY GENERATION PROGRAM SOURCE & DATA 12526
NESC0185_02.005 ASSEMBLER ROUTINES IBM 360 513
NESC0185_02.006 GAMTEC-2 OUTPUT 678
NESC0185_02.007 OUTPUT OF UPDATED GAMTEC-2 17015
NESC0185_02.008 EDITED LIBRARY 5002
NESC0185_02.009 LIBRARY GENERATION OUTPUT 5002
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17. CATEGORIES
  • B. Spectrum Calculations, Generation of Group Constants and Cell Problems

Keywords: Bl method, Boltzmann statistics, Dancoff correction, Pl method, Wigner-Wilkins model, Wilkins equation, cylinders, group constants, moderators, multigroup theory, reactor lattices, spectra, thermal neutrons.