FENDL-2.1, Update of an evaluated nuclear data library for fusion applications

A description of the work undertaken towards the development of a new version of the FENDL-2 library is given, detailing the selection of the evaluated nuclear data files, the processing performed and the resultant processed files.These include an updated version of the FENDL-2 library (termed FENDL-2.1), the corresponding ACE library for MCNP family of Monte Carlo codes, the MATXS library for deterministic transport codes and the ACEDOP package for Doppler broadening of the resolved resonance cross sections in the ACE files.