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NESC0547 GAMB1T

GAMB-1T, Group Constant Library from P1 or B1 Approximation Neutron Spectra in ANISN Format, DOT Format

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1. NAME OR DESIGNATION OF PROGRAM:  GAMB1T
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2. COMPUTERS
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Program name Package id Status Status date
GAMB-1T NESC0547/01 Tested 01-JUN-1982

Machines used:

Package ID Orig. computer Test computer
NESC0547/01 CDC 7600 CDC 7600
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3. DESCRIPTION OF PROBLEM OR FUNCTION

GAMB1T is a  program that was
designed to  calculate multigroup  neutron cross  sections in  the
high energy  and the  thermal energy  ranges.  It  was created  by
joining  GAM, which  does the  high energy  calculation, and  B1T,
which does the thermal calculation.
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4. METHOD OF SOLUTION

GAMB1T provides broad-group flux and current- averaged neutron cross sections. They are based on a thermal cross section library consisting of 99 fine groups (0-2.38 eV), and a fast neutron library consisting of 68 fine groups (0.414 eV - 10 MeV, 1/4 lethargy intervals). The fluxes and currents required to obtain  the broad-group cross sections may be calculated with GAMB1T or may  be entered into the program. In addition, a Maxwellian spectrum may  be used in the thermal range. If the flux is calculated, either the  B1 or P1 methods of solving the transport equation may be used. In effect, the steady-state transport equation is solved for an infinite medium problem. The program provides cross sections for a full P1 transport calculation. Cards are punched out in a format suitable for input to the ANISN and DOT discrete-ordinates transport codes.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
   20 nuclides per problem
   32 GAM (fast) broad energy groups
   48 B1T (thermal) broad energy groups
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6. TYPICAL RUNNING TIME

5  minutes  are  required   for  a  typical
problem.
NEA-DB executed the test case on CDC 7600 in 9 CP seconds.
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7. UNUSUAL FEATURES OF THE PROGRAM

B1T  solves  equations   in  the
thermal energy range  (0 less than or  equal e less than  or equal
2.38 eV) that are consistent with  the equations solved within the
GAM  program  and  comparable  to those  solved  with  the  GATHER
program.  B1T  provides fluxes and  currents and includes  both P0
and P1 scattering matrices in  its cross section library.  Initial
fine energy group fluxes and currents  may be obtained from GAMB1T
which  can  be  used  in  obtaining  broad-group  cross  sections.
Subsequently  fine-group  fluxes  and  currents  obtained  from  a
transport  theory calculation  may be  input to  GAMB1T to  obtain
improved broad-group cross sections.
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8. RELATED AND AUXILIARY PROGRAMS:  GAM, GATHER, and QUERY
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9. STATUS
Package ID Status date Status
NESC0547/01 01-JUN-1982 Tested at NEADB
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10. REFERENCES

- W.H. Gray and G. Collier:
  GAMB1T User's Manual
  WANL-TME-1751 (February 1968).
- G. Collier and G. Gibson:
  GAMB1T Program
  WANL-TME-1752 (April 1968).
- L.L. Moran, G. Collier, A.S. Johnston, and G. Gibson:
  Thermal Range Library for GAMB1T Program
  WANL-TME-1830 (July 1968).
- G. Collier and L.L. Moran:
  Utility Programs for GAMB1T Thermal Range Library
  WANL-TME-1970 (October 1969).
- G. Collier, S.A. Fody, G. Gibson, and L.L. Moran:
  New Cross Sections for the GAMB1T Library, Tapes FSGAM24 and
  CGBIT11
  WANL-TME-1965 (October 1969).
- S.A. Fody, G. Gibson, N.A. Nice, and J.L. Wytiaz:
  New Cross Sections for the GAMB1T Library, Tapes FSGAM29 and
  CGBIT15
  WANL-TME-2690 (April 1970).
NESC0547/01, included references:
- G. Collier, G. Gibson, L.L. Moran, R.K. Disney, and R.S. Kaiser:
  Second Version of the GAMB1T Code
  WANL-TME-1969 (November 1969).
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11. MACHINE REQUIREMENTS:  115,000 octal words (SCM) on CDC 7600.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0547/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:   SCOPE 3.0.
SCOPE 2.1 (CDC 7600).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

Options included in the second version of GAMB1T are -
(a) the flux and current spectrum calculated in a preceding  problem may be reused in a subsequent stacked problem         without recalculation,
(b) cross section data in the EXTERMINATOR2 (NESC Abstract 156)  two-dimensional diffusion theory code format can be         produced,
(c) the total elastic scattering cross section including the  anisotropic scattering effect in the center-of-mass system  is calculated in the APPROPOS data preparation code format,         and
(d) all output may be produced on either cards or magnetic tape  or both. All cross section sets that are punched and/or put         on tape are printed.
GAMB1T is of limited use to other than CDC6600 installations because the library tapes are in CDC6600 binary format not readily adapted to other machines.
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15. NAME AND ESTABLISHMENT OF AUTHORS

                 G. Gibson
                 Advanced Reactor Division
                 Westinghouse Electric Corporation
                 Waltz Mill Site
                 Box 158
                 Madison, Pennsylvania  15663
                 G. Collier
                 Nuclear Energy Systems
                 Westinghouse Electric Corporation
                 Box 355
                 Pittsburgh, Pennsylvania  15230
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16. MATERIAL AVAILABLE
NESC0547/01
File name File description Records
NESC0547_01.001 GAMB-1T INFORMATION 39
NESC0547_01.002 GAMB-1T SOURCE PROGRAM (FORTRAN-4) 4994
NESC0547_01.003 GAMB-1T ORIGINAL SAMPLE CASE INPUT 28
NESC0547_01.004 GAMB-1T MODIFIED SAMPLE CASE INPUT 30
NESC0547_01.005 GAMB-1T JCL FOR SAMPLE CASE 26
NESC0547_01.006 GAMB-1T OUTPUT OF SAMPLE CASE 1213
NESC0547_01.007 FSGA02 LIBRARY TAPE9 752
NESC0547_01.008 B1T2 LIBRARY TAPE11 2761
NESC0547_01.009 QRY12 LIBRARY TAPE12 27
NESC0547_01.010 GAS2 LIBRARY TAPE18 1754
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17. CATEGORIES
  • B. Spectrum Calculations, Generation of Group Constants and Cell Problems

Keywords: cross sections, multigroup, neutron spectra.