last modified: 09-SEP-1987 | catalog | categories | new | search |

NEA-1139 UNC32/33.

UNC32/33, Covariance Matrices from ENDF/B-5 Resonance Parameter Uncertainties

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1. NAME OR DESIGNATION OF PROGRAM:  UNC32/33.
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2. COMPUTERS
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Program name Package id Status Status date
UNC32/33 NEA-1139/01 Tested 09-SEP-1987

Machines used:

Package ID Orig. computer Test computer
NEA-1139/01 CDC CYBER 176 CDC CYBER 740
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3. DESCRIPTION OF PROGRAM OR FUNCTION

The programs UNC 32/33 read uncertainty information from cross-section libraries in the ENDF/B-V format (autocorrelations) and convert these uncertainty data to a group structure selected by the user. In the conversion procedure a  weighting neutron spectrum is needed.
The converted cross-section uncertainty data can be used in adjustment programs and to calculate the uncertainty in calculated reaction rates.
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4. METHOD OF SOLUTION

Straightforward application of uncertainty propagation relations.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:  None detected for the ENDF/B-V dosimetry file.
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6. TYPICAL RUNNING TIME

The calculation time expressed in system seconds is problem dependent. For the program UNC32 about 20 s and for the program UNC33 about 60 s are needed for a relatively complicated reaction.
NEA 1139/01: NEA-DB executed the test problems included in this package on a CDC CYBER 740 computer. The following CPU times were required: 91.1 seconds (UNC32); 128.5 seconds (UNC33).
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7. UNUSUAL FEATURES OF THE PROGRAM

The programs UNC32/33 are relatively small programs which make the cross-section uncertainty data available for calculations with neutron spectrum adjustment codes and/or for the calculation of the uncertainty in calculated reaction rates.
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8. RELATED AND AUXILIARY PROGRAMS

The programs UNC32/33 are accompanied by two small utility programs which can read and print the data of the direct access output files.
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9. STATUS
Package ID Status date Status
NEA-1139/01 09-SEP-1987 Tested at NEADB
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10. REFERENCES:
NEA-1139/01, included references:
- H.J. Nolthenius:
  Computer Programs for Calculating Group Cross-Section Covariances
  from Uncertainty Parameters in the ENDF/B-V Format - UNC 32/33
  ECN-202  (October 1987)
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11. MACHINE REQUIREMENTS:  Computer and line printer.
NEA-1139/01
To run the sample problems included in this package on  a CDC CYBER 740 computer, main storage requirements are: 65,224 (octal) words (UNC32); 110,623 (octal) words (UNC33).
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-1139/01 FORTRAN-77
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  CDC NOS/BE.
NEA-1139/01
NOS 2.5.1 (CDC CYBER 740) with compiler FTN5.1+650.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

          H.J. Nolthenius
          Netherlands Energy Research FoundatioN ECN
          Postbus 1
          1755 ZG Petten, Netherlands
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16. MATERIAL AVAILABLE
NEA-1139/01
File name File description Records
NEA1139_01.001 Information file 83
NEA1139_01.002 UNFM auxiliary program source 54
NEA1139_01.003 UNC32 source program (FORTRAN-77) 562
NEA1139_01.004 UNC32 sample problem input data 5
NEA1139_01.005 UNC32 sample problem printed output 756
NEA1139_01.006 U32 auxiliary program source 49
NEA1139_01.007 U32 sample problem printed output 792
NEA1139_01.008 UNC33 source program (FORTRAN-77) 745
NEA1139_01.009 UNC33 sample problem input data 105
NEA1139_01.010 UNC33 sample problem printed output 223
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17. CATEGORIES
  • M. Data Management

Keywords: correlations, covariance matrices, data uncertainties, evaluated data, multigroup theory, resonance absorption, resonance scattering.