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Report No.
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RAMI analysis of the ITER central safety system

Kitazawa, Sin-iti; Okayama, Katsumi*; Neyatani, Yuzuru; Sagot, F.*; Van Houtte, D.*

In the ITER Project, the Reliability, Availability, Maintainability and Inspectability (RAMI) approach has been adopted for technical risk control to help aid the design of the components in preparation for operation and maintenance. A RAMI analysis was performed on the conceptual design of the ITER Central Safety System (CSS). A functional breakdown was prepared in a bottom-up approach. Reliability block diagrams were prepared to estimate the reliability and availability of each function under the stipulated operating conditions. The inherent availability of the ITER CSS expected after implementation of mitigation actions was calculated to be 99.80%, which is consistent with the project required value of 99.9 $$pm$$ 0.1%. A Failure Modes, Effects and Criticality Analysis was performed. This analysis reduces the risk levels and increases the availability of the main functions.

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