Emergency operating procedures (EOPs) are essential for maintaining the fundamental safety functions and for preventing core damage during both design basis accidents and beyond design basis accidents in nuclear power plants (NPPs). This publication is applicable for all reactor technologies and comprehensively deals with all aspects of the development, implementation and review of EOPs using state of the art experience. The primary objective of this publication is to provide guidance and to be used as a reference for teams of experts in charge of the development or review of EOPs at specific NPPs.