Reliability, Availability, Maintainability and Inspectability (RAMI) are key elements in the engineering development of the Demonstration Power Plant (DEMO) reactor. RAMI assessments play an important role during all design cycle phases by focusing on different aspects depending on the development stage. In fact, system functions, related requirements and deriving constraints are the main objective of RAMI assessment during pre-conceptual and conceptual design phases, when getting insight on the rationale of the plant. The identification of potential failure mechanisms, needs of design updates to remove such mechanisms or mitigate related consequences, become the main goal of analysis as design details increase during subsequent plant development phases. Some of the RAMI analyses performed in the 2019 for different DEMO systems and breeding blanket configurations are here presented. Results in terms of expected annual frequency of failures of components, of specific failure events and reliability/availability parameters are reported together with indications about criticality and suggestions for designers to improve reliability and availability of the systems and of the reactor. The study is based on Failure Mode and Effect Analysis (FMEA) and Reliability Block Diagram (RBD) analysis methodologies.
Approach in improving reliability of DEMO
Pinna T.;Dongiovanni D. N.
2020-01-01
Abstract
Reliability, Availability, Maintainability and Inspectability (RAMI) are key elements in the engineering development of the Demonstration Power Plant (DEMO) reactor. RAMI assessments play an important role during all design cycle phases by focusing on different aspects depending on the development stage. In fact, system functions, related requirements and deriving constraints are the main objective of RAMI assessment during pre-conceptual and conceptual design phases, when getting insight on the rationale of the plant. The identification of potential failure mechanisms, needs of design updates to remove such mechanisms or mitigate related consequences, become the main goal of analysis as design details increase during subsequent plant development phases. Some of the RAMI analyses performed in the 2019 for different DEMO systems and breeding blanket configurations are here presented. Results in terms of expected annual frequency of failures of components, of specific failure events and reliability/availability parameters are reported together with indications about criticality and suggestions for designers to improve reliability and availability of the systems and of the reactor. The study is based on Failure Mode and Effect Analysis (FMEA) and Reliability Block Diagram (RBD) analysis methodologies.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
