Izvestiya vuzov. Yadernaya Energetika

The peer-reviewed scientific and technology journal. ISSN: 0204-3327

Testing covariance matrices of uncertainties in the BNAB data system

7/14/2014 2014 - #02 Physics and technology of nuclear reactors

Andrianova O.N. Golovko Yu. E. Jerdev G.M. Zadornov D.V. Koscheev V.N. Manturov G.N. Peregudov A.A. Tsiboulya A.M.

DOI: https://doi.org/10.26583/npe.2014.2.12

UDC: 621.039.51.17

The growing interest in evaluation of computational uncertainties in the main neutron-physical characteristics led to the development of nuclear data covariance libraries. Taking into account the recent achievements in this area, the covariance matrices of uncertainties in the BNAB-93 group constant library needed to be verified which could be done by using additional information from current neutron data libraries.

The present work is focused on testing covariance matrices of uncertainties which were derived from expert evaluation of the current version of the BNAB group constants library based on evaluated data files RUSFOND-2010. The testing process involved comparing and analyzing computational uncertainties of average cross-sections for typical fast reactor spectra from the BNAB covariance data library with similar data from other current libraries (like ENDF/B, JENDL, COMMARA and others).

In addition, uncertainties of important neutron-physics characteristics have been calculated for numerous test models of advanced liquid-metal-cooled fast reactors based on COMMARA and BNAB covariance data libraries. The main sources of uncertainties have been analyzed.


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neutron data covariance matrix criticality fast reactor model