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RISS 인기검색어
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- 저자 : I. Duhamel (검색결과 1 건)
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Impact of Cross-Section-Covariance Data on Results of High-Confidence Criticality Validation
T. Ivanova,I. Duhamel,E. Letang 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Neutron cross-section-covariance data are used for high-confidence criticality validation based upon ``adjustment'' method. To investigate how they impact results of the validation study, three sets of the covariance data (ENDF/B-V, JENDL-3.2, and TENDL-2009) were used to establish prior and posterior (post-adjusted) uncertainties for application cases with typical uranium dioxide fuel used in criticality safety analysis. Data from the French Fission Product integral experiments were used for the adjustment. The experiments were thoroughly selected and analysed to establish correlation between experimental uncertainties. It is shown the k_(eff) uncertainties due to the original covariance data differ significantly. While the post-adjusted k_(eff) uncertainties decrease significantly and are similar, irrespective of the initial matrices, for the applications systems which are similar to the experiments in k_(eff) sensitivities to nuclear data. This demonstrates a prevalent role of the integral experiments in the uncertainty assessment with the adjustment technique if enough reliable experiments are available. Three sets of full initial and post-adjusted matrices of contributions to overall k_(eff) uncertainties due to neutron cross sections are compared. The comparison shows that the post-adjusted uncertainties are decreased because of negative cross-correlations, which appear between reactions for the same and different isotopes, rather than because of reduction of uncertainties.
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