The status of the Joint Evaluated Fission and Fusion file (JEFF) is described. Recently. the .JEFF- 3.1 1. nuclear data library was released, and shortly after adopted by the French nuclear power industry for inclusion in their production and analysis codes. Recent updates include actinide evaluations. materials evaluations that have emerged from various European nuclear data projects, the activation library, the decay data and fission yield sub-libraries, and fusion-related data files from the European F4E. project. The revisions were motivated by the availability of new measurements, modeling capabilities and trends from integral experiments. Validations have been performed, mainly for criticality, reactivity temperature coefficients, fuel inventory, decay heat and shielding of thermal and fast systems. The next release of the library, JEFF-3.2. will be discussed. This will contain among others a significant increase of covariance data evaluations, modem evaluations for various structural materials, a larger emphasis on minor actinides and addition of high-quality gamma production data for many fission products.
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