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Essential technical requirements for mechanical components and metallic structures foreseen for Generation IV nuclear reactors Ingestion-build-53008 12 - Method of declaring1 Scope This document defines the essential technical requirements that are addressed in the process of design and construction of Generation IV (GEN IV) nuclear reactors. It does not address operation, maintenance and in service inspection of reactors. Six reactor concepts are considered for GEN IV: the sodium fast reactor, the lead fast reactor, the gas fast reactor, the very high temperature reactor, the supercritical water reactor and the molten