[en] In collaboration with the Department of Energy (DOE) Nuclear Criticality Safety Program (NCSP), the Institut de Radioprotection et de Surete Nucleaire (IRSN) is leading a new benchmark intercomparison based on the MORET Monte Carlo code using various nuclear data libraries (JEFF-3.3, ENDF/B-VII.1 and ENDF/B-VIII.0) and a large selection of benchmarks. Their results are collated with those from Lawrence Livermore National Laboratory (LLNL), Los Alamos National Laboratory (LANL) and Oak Ridge National Laboratory (ORNL) using respectively the COG, MCNP and KENO (SCALE package) Monte Carlo codes associated with ENDF/B-VII.1 and ENDF/B-VIII.0 libraries. Due to the large number of benchmarks involved (about 2000), this effort is envisioned to take three years and is currently focused on Highly Enriched Uranium systems (HEU) and Plutonium systems (PU). About 450 HEU and 500 PU benchmarks taken from the ICSBEP handbook were considered covering a large energy spectra range (from thermal to fast) and a wide range of isotopes. Rigorous cross-checking of results using same nuclear data evaluations has already revealed subtle modeling and interpretation user errors, as well as some inconsistencies in the DICE database, that will be gathered and reported to the ICSBEP working group. After resolving and correcting errors in input decks, some small remaining discrepancies indicate possible issues with the processing of nuclear data and thermal scattering law. Once confident in the benchmark modeling, the comparison of the results obtained with various libraries allows validating nuclear data of various isotopes of interest for criticality safety and highlighting the improvement made these last years in the state-of-the art nuclear data libraries. (authors)