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NESC0393 XSDRN.

XSDRN, MultiGroup Cross-Sections from Resonance Data Library, Neutron Spectra and Group Constant Collapsing

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1. NAME OR DESIGNATION OF PROGRAM:  XSDRN.
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2. COMPUTERS
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Program name Package id Status Status date
XSDRN NESC0393/02 Tested 01-MAR-1974

Machines used:

Package ID Orig. computer Test computer
NESC0393/02 IBM 370 series IBM 370 series
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3. NATURE OF PHYSICAL PROBLEM SOLVED

XSDRN uses the Nordheim integral  treatment, narrow resonance, or infinite mass approximation to process resonance data on a master cross section library and thus obtain microscopic fine-group cross sections for a large number of nuclides. The code will then use these cross sections in an independent calculation to solve for fluxes, eigenvalues, critical dimensions, etc., using discrete ordinates, diffusion, or an infinite medium theory calculation. The fine-group fluxes thus obtained can then be used to collapse the fine-group cross section data to a more tenable broad-group structure for use in several independent computer codes.
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4. METHOD OF SOLUTION

The principal calculations performed by XSDRN (resonance calculation and flux calculation) both employ numerical finite-difference techniques. For the resonance calculation, this involves a Simpsons integration to solve for the collision density in the resonance range. The flux calculations employ a multigroup energy structure, an arbitrary spatial structure and a mechanical angular quadrature, all of which must be used in the various integration and differencing schemes in the code.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The principal restriction is the availability of adequate core storage to build required arrays. The code is flexibly dimensioned which means that array sizes are set for the particular problem at execution time. (Provisions are also available for storing certain large data arrays out of core, if need be.)
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6. TYPICAL RUNNING TIME

Typical resonance calculations have been run on the IBM360/75 in from one-half to one minute per nuclide.
A typical flux calculation (S4 P3, 25 space points, 123 energy groups, cylinder, K-calculation, reduce cross sections, 4 resonance  nuclides) generally runs in 10 to 12 minutes. A fixed source calculation for the same system would take approximately the same time.
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7. UNUSUAL FEATURES OF THE PROGRAM

The flexible dimensioning scheme employed by XSDRN allows one to make optimal use of core storage.
A unique method of storing cross sections is employed to eliminate input of unnecessary transfer cross sections.
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8. RELATED AND AUXILIARY PROGRAMS

The master library tape for XSDRN is produced by XLACS. Cross section tapes can be generated for ANISN (ACC abstract 151), DOT, CITATION (ACC abstract 387), ROD, or the EXTERMINATOR2 (ACC abstract 156) codes.
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9. STATUS
Package ID Status date Status
NESC0393/02 01-MAR-1974 Tested at NEADB
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10. REFERENCES

- N. M. Greene and C. W. Craven, Jr.:
  XSDRN, A Discrete Ordinates Spectral Averaging Code.
  ORNL-TM-2500, July 1969, and Errata
- N. M. Greene:
  XLACS, Cross Section Production Package for XSDRN.
  CTC Report (to be published).
- Description of XSDRN Tape Contents, ACC Note, May 1970.
NESC0393/02, included references:
- N.M. Greene and C.W. Craven, Jr.:
  XSDRN - A Discrete Ordinates Spectral Averaging Code
  ORNL-TM-2500.
- L.L. Bennett:
  Recommended Fission Product Chains for Use in Reactor Evaluation
  Studies
  ORNL-TM-1658
- M.L. Tobias and G.W. Cunningham III
  A Simple Method fo Listing Data Sets in Readable Form
  ORNL-CF-72-7-32
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11. MACHINE REQUIREMENTS

On the IBM360/65 approximately 90k words of directly addressable core storage must be available for the program. The various calculational options require from 4 to 13 input/output  devices, depending on the problem. At least one direct-access device is required.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0393/02 FORTRAN-IV
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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED:  OS/360.
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14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

XSDRN is presently used in a four-level overlay structure consisting of 14 separate links. Subroutine DA must be compiled with the FORTRAN G compiler.
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15. NAME AND ESTABLISHMENT OF AUTHOR

                 N. M. Greene
                 Computing Technology Center
                 P. O. Box P
                 Oak Ridge, Tennessee  37830

                 C. W. Craven, Jr.
                 Oak Ridge National Laboratory
                 P. O. Box Y
                 Oak Ridge, Tennessee  37830
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16. MATERIAL AVAILABLE
NESC0393/02
File name File description Records
NESC0393_02.001 INFORMATION 1
NESC0393_02.002 X-SECTION LIBRARY - BCD 182380
NESC0393_02.003 XSDRN SOURCE PROGRAM 6666
NESC0393_02.004 XSDRN OVERLAY CARDS 30
NESC0393_02.005 XSDRN DD CARDS 20
NESC0393_02.006 XSDRN SAMPLE PROBLEM INPUT 96
NESC0393_02.007 X-SECTION CONVERTER PROGRAM - F4 EBCDIC 177
NESC0393_02.008 X-SECTION CONVERTER PROGRAM DD CARDS & DATA 10
NESC0393_02.009 X-SECTION LISTING PROGRAM - F4 EBCDIC 301
NESC0393_02.010 X-SECTION LISTING PROGRAM DD CARDS & DATA 6
NESC0393_02.011 PRINTED OUTPUT OF XSDRN 8610
NESC0393_02.012 PRINTED OUTPUT OF CONVERTER PROGRAM 193
NESC0393_02.013 PRINTED OUTPUT OF LISTING PROGRAM 4275
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17. CATEGORIES
  • B. Spectrum Calculations, Generation of Group Constants and Cell Problems

Keywords: SN method, angular distribution, cell calculation, cylinders, flux distribution, group constants, multigroup, one-dimensional, resonance, slabs, spheres, transport theory.