New covariance data and their impact on ADS designs

Nuclear data uncertainties and their impact on a very wide range of reactor systems, including their associated fuel cycles, have to be assessed in order to consolidate preliminary design studies for new innovative systems. One specific class of systems is the so-called "dedicated waste transmuters", that are fast neutron systems (critical or sub-critical, i.e. ADS), loaded with a Minor Actinide dominated fuel and potentially U-free. The availability of very general tools for sensitivity and uncertainty analysis together with new variance-covariance matrix data, produced in a joint effort under the auspices of the OECD-NEA, by the world leading nuclear data evaluation groups, makes that endeavor particularly significant. In this report we discuss major results of interest for dedicated ADS and point out the most important fields and data types, where priority improvements are required.