Computer Programs

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, 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 OR MONITOR UNDER WHICH PROGRAM IS EXECUTED, ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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Program name | Package id | Status | Status date |
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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.

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.

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.)

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.

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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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.

- 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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NESC0393/02

File name | File description | Records |
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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 |

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