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

Diogo Rechena*, Virgínia Infante, Elsa Henriques, Søren B. Korsholm, Axel W. Larsen, Bruno Gonçalves, Alberto Vale, Raul Luís

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


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

Original languageEnglish
Article number112454
JournalFusion Engineering and Design
Number of pages8
Publication statusPublished - 2021

Bibliographical note

Funding Information:
IPFN activities received financial support from “Fundação para a Ciência e Tecnologia” through projects UIDB/50010/2020 and UIDP/50010/2020.

This work was supported by FCT , through IDMEC, under LAETA, project UID/EMS/50022/2020.

The work leading to this publication has been funded partially by Fusion for Energy under the Framework Partnership Agreement F4E-FPA-393. This publication reflects the views only of the author, and Fusion for Energy cannot be held responsible for any use which may be made of the information contained therein.


  • Collective Thomson scattering
  • ITER
  • RAMI


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