NB-3650M fatigue calculation procedure

Paul Smeekes, Eero Torkkeli, Mårten Perklen, Otso Cronvall

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


    Fatigue is considered a significant long-term degradation mechanism for safety significant pressure equipment in nuclear power plants. The ASME Section III [1] procedure aims to prevent formation of fatigue cracks during the specified service period. Practical experience gathered during tens of years with hundreds of reactors has shown that the ASME methodology functions very well or is even conservative. Several studies performed in the USA and Japan indicated significant environmental effects on the fatigue as compared to fatigue without environmental effects. This has yielded a methodology as described in the NUREG/CR-6909 [2] and the JSME S NF1-2006 [17]. This methodology should obviously be applied on a best estimate fatigue analysis with reasonable safety factors. Due to the fact that such an analysis is not available and as the ASME methodology functions well this methodology is applied in conjunction with the ASME methodology. Obviously this is conservative, possibly even far overconservative. From an analytical point of view the NB3600 (engineering approach) and NB3200 (detailed 3D analysis) fatigue analysis methodology and the one in the NUREG/CR-6909 (full time history) are not compatible. In the work presented here a methodology was developed to combine these methods.
    Original languageEnglish
    Title of host publicationBaltica IX. International Conference on Life Management and Maintenance for Power Plants
    EditorsPertti Auerkari, Juha Veivo
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    ISBN (Print)978-951-38-8025-5, 978-951-38-8026-2
    Publication statusPublished - 2013
    MoE publication typeA4 Article in a conference publication
    EventBALTICA IX - International Conference on Life Management and Maintenance for Power Plants - Helsinki-Stockholm, Finland
    Duration: 11 Jun 201313 Jun 2013

    Publication series

    SeriesVTT Technology


    ConferenceBALTICA IX - International Conference on Life Management and Maintenance for Power Plants


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