The development of a methodology to allocate RAMI requirements to DEMO: The development of design tools & methodologies for DEMO in Europe

A methodology for apportioning availability goals to the plant level systems of DEMO through the structured elicitation of expert judgment is proposed. Provisional availability targets are derived for DEMO via application of this method, ensuring consistency with an overall plant availability goal. Following this, a methodology for the assessment of the feasibility of these targets is outlined, and an initial demonstration of this method is applied to the DEMO Tokamak System. In this way the technology readiness of systems from an availability perspective can be assessed, such that areas for targeted Reliability, Availability, Maintainability and Inspectability (RAMI) research and development can be prioritized to guide and inform the DEMO programme during the initial stages. The approach forms the basis for a structured approach to RAMI Research during the DEMO pre-conceptual design phase to ensure that RAMI requirements are captured and given proper consideration alongside other design parameters.