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NESC0184 BRT1

THERMOS-ANL, 1-D Integral Transport for Neutron Spectra, Slab and Cylinder
THERMOS BRT-1, 1-D Integral Transport for Neutron Spectra, Slab and Cylinder

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1. NAME OR DESIGNATION OF PROGRAM:  BRT1
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2. COMPUTERS
To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.
Program name Package id Status Status date
BRT-1 NESC0184/01 Tested 01-APR-1973
THERMOS-ANL NESC0184/05 Tested 12-APR-2001

Machines used:

Package ID Orig. computer Test computer
NESC0184/01 IBM 370 series IBM 370 series
NESC0184/05 CDC 6500 PC Pentium II 450,DEC ALPHA W.S.
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3. DESCRIPTION OF PROBLEM OR FUNCTION

BRT1, like the original THERMOS code developed by H. Honeck of Brookhaven National Laboratory, computes the scalar thermal neutron spectrum as a function of position in a lattice by solving the integral transport equation with isotropic scattering. One-dimensional slab or cylindrical geometry may be used. As output the code supplies flux-averaged values of sigma a, sigma f, nu sigma f, sigma s, and d for the cell  composition and the values of sigma a, sigma f, nu sigma f, sigma s, and sigma tr for the isotopic constituents.
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4. METHOD OF SOLUTION

The method used in solving the transport integral equation is the power iteration method. To accelerate convergence the code uses a combination of Gauss iteration, renormalization, over-relaxation, and extrapolation procedures.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
   30 speed groups
   30 space points
   30 isotopes in mixture
   30 isotopes in the edit
    8 mixtures
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6. TYPICAL RUNNING TIME

The sample problem is a 2-region slab and is  solved using 10 space points and 30 speed groups. There are two mixtures used. Five materials are used in the cell and one in the edit. The time in general is a function of the number of space points and energy groups used by the problem.
Typical running time for BRT1 with the random access library is one minute with a reflecting boundary condition and 30 seconds with a white boundary condition. Succeeding cases require approximately 15 seconds each.
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7. UNUSUAL FEATURES OF THE PROGRAM

In BRT1 options include the white  boundary condition, current calculation, transverse buckling, linear anisotropic scattering correction, and smeared cell punched output for use as region input to a succeeding case. Random access library  data can be stored on drum or disk.
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8. RELATED AND AUXILIARY PROGRAMS

RLITHE updates and/or prints the BRT data tape or random access data.
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9. STATUS
Package ID Status date Status
NESC0184/01 01-APR-1973 Tested at NEADB
NESC0184/05 12-APR-2001 Tested at NEADB
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10. REFERENCES

- H.C. Honeck:
  A Thermalization Transport Theory Code for Reactor Lattice
  Calculations
  BNL-5826 (September 1961).
- H.C. Honeck:
  The Distribution of Thermal Neutrons in Space and Energy in
  Reactor Lattices Part 1 - Theory
  Nuclear Science and Engineering, p. 193 (1960).
- D.R. Skeen and L.J. Page:
  THERMOS/Battelle..The Battelle Version of the THERMOS Code
  BNWL-516 (June 1967).
NESC0184/01, included references:
- C.L. Bennett and W.L. Purcell:
  BRT-I Battelle Revised THERMOS
  BNWL-1434 (June 1970).
NESC0184/05, included references:
- THERMOS: A Thermalization Transport Theory Code for Reactor
Lattice Calculations (BNL-5826
- B.J. Toppel and I. Baksys:
The Argonne-Revised THERMOS Code
ANL-7023 (March 1965)
- O. Fetzmann:
Beschreibung der Aenderungen in den Programmen
THERMOS, GAKER und LIBP (TM-PH-377) 26/1/1971
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11. MACHINE REQUIREMENTS

64K memory, input, output, program, library,  and punch units plus 3 scratch units or equivalent drum storage.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0184/01 FORTRAN-IV
NESC0184/05 FORTRAN-95
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:   CSCX.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

                 C. L. Bennett and W. L. Purcell
                 Reactor Physics Department
                 Pacific Northwest Laboratories
                 Battelle
                 P. O. Box 999
                 Richland, Washington  99352
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16. MATERIAL AVAILABLE
NESC0184/05
source program   mag tape                                           SRCTP
test-case data   mag tape                                           DATTP
test-case output mag tape                                           OUTTP
aux program      mag tape                                           AUXTP
report                                                              REPPT
user's guide                                                        WRKPT
NESC0184/01
File name File description Records
NESC0184_01.001 RLITHE SOURCE PROGRAMME 494
NESC0184_01.002 RLITHE LIBRARY INPUT DATA 7450
NESC0184_01.003 BRT-1 SOURCE PROGRAMME 2571
NESC0184_01.004 BRT-1 JCL+OVERLAY CARDS+SAMPLE INPUT 39
NESC0184_01.005 RLITHE PRINT OUT OF THE LIBRARY 4968
NESC0184_01.006 BRT-1 SAMPLE OUTPUT 547
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17. CATEGORIES
  • B. Spectrum Calculations, Generation of Group Constants and Cell Problems

Keywords: cross sections, cylinders, neutron spectra, one-dimensional, reactor lattices, scattering, slabs, thermal neutrons, transport theory.