RAMI analysis of the collective Thomson scattering system front-end – Part1 – Failure modes effects and criticality analysis

ITER is a tokamak nuclear fusion reactor intended to demonstrate the feasibility of as carbon-free energy source. In order control potential technical risks, subsystems are assessed through Reliability, Availability, Maintainability and Inspectability (RAMI) analysis, which includes Failure Modes Effects Criticality Analysis (FMECA). This paper deals with FMECA front-end components Collective Thomson Scattering (CTS) diagnostic, involves top-down functional breakdown system, identification critical failure modes, their effects consequences for system. Furthermore, methodology allows analysis possible mitigation actions, may reduce mode risk levels. The was performed in two stages, one concerning modes CTS itself, interrupt operations. Results indicate that there no pose significant However, actions were required levels compromise diagnostics availability. article covers first half RAMI FMECA.