[en] This paper presents a Bayesian approach based on integral experiments to create correlations between different isotopes which do not appear with differential data. A simple Bayesian set of equations is presented with random nuclear data, similarly to the usual methods applied with differential data. As a consequence, updated nuclear data (cross sections, ν-bar, fission neutron spectra and covariance matrices) are obtained, leading to better integral results. An example for ²³⁵U and ²³⁸U is proposed taking into account the the Imf7 (intermediate enrichment uranium metallic fast number 7) criticality benchmark also known as Bigten. (authors)