ENDF/B-VIII.0 Covariance Data Development and Testing for Advanced Reactors

Technical Report · Fri Mar 01 04:00:00 EST 2019

DOI:https://doi.org/10.2172/1502567· OSTI ID:1502567

Sobes, Vladimir ^[1]; Marshall, William B.J. ^[1]; Wiarda, Dorothea ^[1]; Bostelmann, Friederike ^[1]; Holcomb, Andrew M. ^[1]; Rearden, Bradley T. ^[1]

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1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

This report documents the ENDF/B-VIII.0 covariance data development and testing performed at Oak Ridge National Laboratory performed under the auspices of the US Department of Energy Office of Nuclear Energy. This work supports modeling and simulation of advanced reactor designs in the US by analyzing, validating and improving the nuclear data that provide underlying physics for calculations. This report assesses nuclear data uncertainty information for neutron cross sections, provided in the form of covariance matrices, in the 2018 ENDF/B-VIII.0 library. A review and interpretation of some of the issues with the current covariance library is provided. A new approach to augment the ENDF/B-VIII.0 covariance matrix to accurately reflect uncertainties in the results of modeling and simulation reliant on the current nuclear data library is documented. Rigorous testing of the ENDF/B-VIII.0 covariance data is documented. Finally, the performance of the ENDF/B-VIII.0 covariance data for advanced reactor applications is assessed.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1502567
• Report Number(s): ORNL/TM-2018/1037
• Country of Publication: United States
• Language: English

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