RAMI analysis of ITER CODAC

In the ITER project, Reliability, Availability, Maintainability and Inspectability (RAMI) approach has been adopted for technical risk control to guide the design of components and the preparation for operation and maintenance. RAMI analysis of the ITER CODAC System, the central plant control system...

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Published in:Fusion engineering and design Vol. 87; no. 7-8; pp. 1510 - 1513
Main Authors: Kitazawa, Sin-iti, Okayama, Katsumi, Neyatani, Yuzuru, Sagot, Francois, van Houtte, Didier, Abadie, Lana, Yonekawa, Izuru, Wallander, Anders, Klotz, Wolf-Dieter
Format: Journal Article
Language:English
Published: Elsevier B.V 01.08.2012
Subjects:
Availability
CODAC
Computer programs
Design engineering
Failure modes
ITER
Maintenance
Mathematical analysis
Mathematical models
RAMI
Risk
Availability
ITER
RAMI
CODAC
ISSN:0920-3796, 1873-7196
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Abstract In the ITER project, Reliability, Availability, Maintainability and Inspectability (RAMI) approach has been adopted for technical risk control to guide the design of components and the preparation for operation and maintenance. RAMI analysis of the ITER CODAC System, the central plant control system, was performed in the current design available in the conceptual design phase. A functional breakdown was prepared, resulting in the system being divided into 5 main functions themselves divided into sub-functions. The Failure Modes, Effects and Critical Analysis were performed to initiate risk mitigation actions. Criticality matrices highlight the risks of the different failure modes with regard to their probability of occurrence and the impact on the availability. Identified risks exist on the effect on data storage hardware and for computer software. Reliability block diagrams were prepared to estimate the reliability and availability of each function under stipulated operating conditions. The inherent availability of the mandatory functions for the control of plasma experiments with mitigations was calculated to be 99.2% that is higher than the project required value of 98.8%. Compensating provisions are advocated in terms of design, testing, operation procedure and maintenance requirements in order to reduce risk levels.
AbstractList In the ITER project, Reliability, Availability, Maintainability and Inspectability (RAMI) approach has been adopted for technical risk control to guide the design of components and the preparation for operation and maintenance. RAMI analysis of the ITER CODAC System, the central plant control system, was performed in the current design available in the conceptual design phase. A functional breakdown was prepared, resulting in the system being divided into 5 main functions themselves divided into sub-functions. The Failure Modes, Effects and Critical Analysis were performed to initiate risk mitigation actions. Criticality matrices highlight the risks of the different failure modes with regard to their probability of occurrence and the impact on the availability. Identified risks exist on the effect on data storage hardware and for computer software. Reliability block diagrams were prepared to estimate the reliability and availability of each function under stipulated operating conditions. The inherent availability of the mandatory functions for the control of plasma experiments with mitigations was calculated to be 99.2% that is higher than the project required value of 98.8%. Compensating provisions are advocated in terms of design, testing, operation procedure and maintenance requirements in order to reduce risk levels.
Author Neyatani, Yuzuru
Sagot, Francois
van Houtte, Didier
Wallander, Anders
Kitazawa, Sin-iti
Okayama, Katsumi
Yonekawa, Izuru
Klotz, Wolf-Dieter
Abadie, Lana
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  fullname: Wallander, Anders
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  givenname: Wolf-Dieter
  surname: Klotz
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  organization: ITER Organization, Route de Vinon sur Verdon, 13115 Saint Paul Lez Durance, France
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Cites_doi 10.1016/j.fusengdes.2010.03.007
10.1016/j.fusengdes.2007.11.013
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SubjectTerms Availability
CODAC
Computer programs
Design engineering
Failure modes
ITER
Maintenance
Mathematical analysis
Mathematical models
RAMI
Risk
Title RAMI analysis of ITER CODAC
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