Status of nuclear data of importance for LMFBR applications prior to the evaluation of ENDF/B-VI

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The evaluation of nuclear data of importance to the LMFBR program has shifted to a Nuclear Data Evaluation Task Force. It is anticipated that the results of these evaluations will be incorporated in ENDF/B-VI. However, several cross sections for reactor applications are included in a simultaneous evaluation of the standard cross sections for ENDF/B-VI organized by the Standard Subcommittee of CSEWG. Cross sections included in this simultaneous evaluation are those of /sup 6/Li(n,..cap alpha..), /sup 6/Li(n,n), /sup 10/B(n,..cap alpha../sub 0/), /sup 10/B(n,..cap alpha../sub 1/), /sup 10/B(n,n), /sup 197/Au(n,..gamma..), /sup 235/U(n,f), /sup 238/U(n,..gamma..), /sup 238/U(n,f), and /sup 239/Pu(n,f). The change of ... continued below

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Pages: 20

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Poenitz, W.P. January 1, 1984.

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The evaluation of nuclear data of importance to the LMFBR program has shifted to a Nuclear Data Evaluation Task Force. It is anticipated that the results of these evaluations will be incorporated in ENDF/B-VI. However, several cross sections for reactor applications are included in a simultaneous evaluation of the standard cross sections for ENDF/B-VI organized by the Standard Subcommittee of CSEWG. Cross sections included in this simultaneous evaluation are those of /sup 6/Li(n,..cap alpha..), /sup 6/Li(n,n), /sup 10/B(n,..cap alpha../sub 0/), /sup 10/B(n,..cap alpha../sub 1/), /sup 10/B(n,n), /sup 197/Au(n,..gamma..), /sup 235/U(n,f), /sup 238/U(n,..gamma..), /sup 238/U(n,f), and /sup 239/Pu(n,f). The change of the evaluation methodology for ENDF/B-VI will result in a much improved definition of the data, their uncertainties and cross correlations. Trends which can be seen in new data and which are caused by the change of the evaluation procedure are toward, lower /sup 239/Pu(n,f), /sup 235/U(n,..gamma..), modestly lower /sup 235/U(n,f), and higher /sup 10/B(n,..cap alpha..) data. The data base for /sup 238/U(n,..gamma..) below 30 keV remains poorly defined and a resolution of the C/E discrepancy of C/sup 28//F/sup 49/ cannot be expected from the infinite dilute capture cross section of /sup 238/U. Anti nu of /sup 252/Cf remains unchanged and therefore also the nu(E) of the fissile isotopes, except at thermal energy.

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Pages: 20

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NTIS, PC A02/MF A01; 1.

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  • ANS topical meeting on reactor physics and shielding, Chicago, IL, USA, 17 Sep 1984

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  • Other: DE85000071
  • Report No.: CONF-840901-15
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 6514332
  • Archival Resource Key: ark:/67531/metadc1207976

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  • January 1, 1984

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  • July 5, 2018, 11:11 p.m.

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  • Oct. 29, 2018, 11:56 a.m.

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Poenitz, W.P. Status of nuclear data of importance for LMFBR applications prior to the evaluation of ENDF/B-VI, article, January 1, 1984; United States. (digital.library.unt.edu/ark:/67531/metadc1207976/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.