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The k-infinity uncertainty due to the cross-section covariance data (COVs) in a PWR-UO 2  fuel assembly geometry was compared between the nuclear data libraries (NDLs) and the individual effects of nuclide and reaction-pair COVs were estimated. The k-infinity uncertainty was evaluated through the random sampling of CASMO5 calculations with the COVs in JENDL-4.0, JENDL-5, ENDF/B-VII.1, ENDF/B-VIII.0, JEFF-3.3, TENDL-2019, and TENDL-2021, neglecting some reaction-pair COVs, which had mathematically incorrect correlation elements. The evaluation confirmed that the major reasons for the discrepancy of the k-infinity uncertainty were the differences in theof  235 U and the (n,γ) cross section of  238 U. Additionally, the individual effects of the discrepancy of COVs were specified from the findings in the sensitivity coefficients of theand the (n,γ) cross section on the k-infinity for the neutron energy. Consequently, this study provided useful knowledge base for evaluating the discrepancy of k-infinity uncertainty, which is the crucial perspectives for the uncertainty analysis in the best estimate plus uncertainty approach.

A comparative study on k-infinity uncertainty due to cross-section covariance data in nuclear data libraries