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Report No.
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RAMI analysis of the ITER CIS

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

In the ITER project, the RAMI approach (Reliability, Availability, Maintainability and Inspectability) has been adopted for technical risk control to guide the design of components in preparation for operation and maintenance. RAMI analysis of the ITER Central Interlock System (CIS), which shall provide investment protection for the ITER systems, was performed on the conceptual design. A functional breakdown was prepared in a bottom-up approach, resulting in the system being divided into 5 main functions and 7 sub-functions which are described using the IDEF0 method. Reliability Block Diagrams were prepared to estimate the reliability and availability of each function under stipulated operating conditions. A Failure Modes, Effects and Criticality Analysis (FMECA) was performed to initiate risk mitigation action. The impact on the availability of the ITER CIS is small enough to comply with the availability requirement of the ITER project.

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