Then, the technical and safety requirements specific to nuclear power plants will be described, as well as their economical effects on the nuclear plant developer and on the whole electrical system. Especially in OECD countries, a strong opposition to large thermal power plants (and in particular to nuclear power plants) and the not-in-my-back-yard (NIMBY) syndrome have undermined or slowed down the planning, construction and grid connection of new generating capacity. Undoubtedly, wide public support or acceptance of the project and appropriate co-ordination with all stakeholders are key elements to its successful and timely completion.