Seismic hazard for critical facilities

Critical facilities are man-made equipments, plants, constructions, and that, if affected by a strong earthquake, can produce serious on people, environment, and economy. Therefore, for these specific provisions in terms of seismic design are required detailed seismic hazard evaluations have to be developed. In this, firstly the concept and meaning of ``critical facilities'' is. Then, a focus on the seismic hazard of nuclear power plants is since this type of critical facilities could be considered the that more than others have contributed to define the most knowledge in the field of seismic hazard assessment.