This publication is devoted to human resource issues related to expanding a nuclear power plant (NPP) fleet, with particular emphasis on expansions including the use of new NPP designs. Lessons learned as well as information from NPP operating organizations in Member States are presented. It is intended that this publication be relevant for the full range of NPP technology considerations, up to and including Generation III innovative designs. The applicable expansion scenarios considered are: adding units of the same or very similar technology at existing sites, adding units of the same or very similar technology at new sites and adding units with considerably different technology.