The objective of this Safety Guide is to provide recommendations and guidance on the assessment of volcanic hazards at a nuclear installation site@ so as to enable the identification and comprehensive characterization of all potentially hazardous phenomena that may be associated with future volcanic events. These volcanic phenomena may affect the suitability of the selected site and some of them may determine corresponding design basis parameters for the installation. This Safety Guide is intended for use by regulatory bodies responsible for establishing regulatory requirements@ for designers of nuclear installations and for operating organizations directly responsible for the assessment of volcanic hazards at a nuclear installation site. This Safety Guide is not intended to deal with response analysis and capacity evaluation of volcanic hazards at the nuclear installation (i.e. plant design aspects@ capacity or fragility calculations of systems@ structures and components).