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(1) Thermonuclear Fusion Division - Safety & Environment

ENTE PER LE NUOVE TECNOLOGIE, L'ENERGIA E L'AMBIENTE Associazione ENEA-EURATOM sulla Fusione FUSION UNIT TECHNOLOGIES DIVISION COLLECTION OF DATA RELATED TO JET OPERATIONAL EXPERIENCE on COMPONENT FAILURE JW5-FT-5. 19 10th of June 200 5 T. Pinna (1).

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(1) Thermonuclear Fusion Division - Safety & Environment

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  1. ENTE PER LE NUOVE TECNOLOGIE, L'ENERGIA E L'AMBIENTE Associazione ENEA-EURATOM sulla Fusione FUSION UNIT TECHNOLOGIES DIVISION COLLECTION OF DATA RELATED TO JET OPERATIONAL EXPERIENCE on COMPONENT FAILURE JW5-FT-5.19 10th of June 2005 T. Pinna (1) (1) Thermonuclear Fusion Division - Safety & Environment Via E. Fermi 45, I-00044, Frascati (Rome), Italy e-mail: pinna@frascati.enea.it,gravanti@frascati.enea.it

  2. JET operational experience on Component failures June 2005 Data collection and analysis: Status of the art LHCD Power Supply system • About 200 failures and malfunctions, related to Radio Frequency systems, occurred in the period January 1997 - May 2003 will be classified and statistically treated • The work will start on September 2005

  3. JET operational experience on Component failures June 2005 Data collection and analysis: Status of the art ICRH system • A first brief discussion was held with Dr. Margaret Graham on April about the ICRH system failures and malfunctions. • She gave me a first list of failures related to the period March 96 – May 96 and, some notes and explanations to understand ICRH system. • Dr Graham is collecting data on ICRH failures recorded in log books in order to provide ENEA a comprehensive list of data for a sufficient number of years. • We decided to meet each other on September to discuss about data collected and correctly set the study.

  4. JET operational experience on Component failures June 2005 Common thoughts about statistical analyses on systems like LH Power Supply and ICRH • Components used in the systems are old and obsolete and statistics performed on such components are not relevant for ITER • The system is “one-of-a-kind” • Failures occurred in the burning period due to design errors or installation errors have been solved so that failures never occurred later All that, probably, need some clarification on the objective of the task in order to get major consensus from the JET Operators

  5. JET operational experience on Component failures June 2005 Objectives of the task • Make available to future Designers, Analysts and Operators know-how gained operating similar facilities by • creating collection of information found out from old Reports and Log books, or interviewing Operators • where possible, classifying the data homogeneously • identifying criticality of components in their operating life, highlighting problems occurred during burning phases and measures of improvement adopted to prevent and eliminate problems • identifying weak and selling points of the facilities and of the design solutions operated and/or tested along the years

  6. JET operational experience on Component failures June 2005 Objectives of the task • Make available to ITER licensing Authority confidence on the identification of malfunctions and possible incidents and accidents that could occur operating similar facilities by • identifying all possible failure modes of the components and the effective occurrence of such failures in the operated life • identifying the possible consequences in terms of induced additional failures, if any • identifying maintenance implications to repair the failures in terms of work efforts and possible radiological exposures • identifying the trends of the failures along the operated life

  7. JET operational experience on Component failures June 2005 Objectives of the task • Make available to Designers, Analysts and Operators data that could give confidence in performing probabilistic evaluations, such as risk assessment and reliability analysis, in planning maintenance activities and in defining use of spare parts by • evaluating statistical data on the overall possible failure modes of the components and of the systems • evaluating statistical data for malfunctions induced by faults in ancillary systems • evaluating statistical data on repairing maintenance and on induced system and/or plant stop

  8. JET operational experience on Component failures June 2005 Objectives of the task Statistical analysis • Performing statistical analyses faults during burning life are not considered, nevertheless, they are important in identifying the trends of faults during the operating life • With a significant operating time also for NO FAULTS is possible to determine failure rates with mean values and uncertainties values • Data on faults for components not only typical of the system but general for the plant, such as welds, flanges, bellows, holes, etc. could go to reinforce previous statistical analysis performed for other systems (i.e.: faults or no faults of components and operating time could be considered in re-evaluating global failure rates)

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