The life cycle of the ESS facility can be described by using four main states: Pre-construction, Construction, Operation and Decommissioning. The scope of this document is to give an overview of “operational states”, to be applied during the Construction and Operation of the ESS facility. These “operational states” (or operational machine states) refer to nominal situations of the machine (the off normal situations, such as incidents, accidents and beyond design basis accident scenarios are not considered yet).