Study on safety margins assessment practices

Otso Cronvall

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


    This study concerns Finnish safety factor definitions applied to structural integrity analyses of nuclear power plant (NPP) piping components. On global level, International Atomic Energy Agency (IAEA) provides information and definitions on safety margins and safety factors of NPP components. In Finland, the significant documents concerning the safety factors of NPP components are YVL Guides. However, they do not give the actual safety factor data, but instead refer to certain applicable standards. These are mainly ASME code Sections III and XI. Both deterministic and probabilistic crack growth analyses were performed for two representative BWR piping components. For comparison purposes, the analyses were carried out both with and without safety factors. Due to various kinds of safety factors and conservative assumptions, it is difficult/ impossible to define what is the total safety margin of a structure or component. Structural integrity analyses of structures and components would benefit from such more specific definitions of safety factors that would give a more accurate assessment of the total safety.
    Original languageEnglish
    Title of host publicationBaltica X
    Subtitle of host publicationInternational Conference on Life Management and Maintenance for Power Plants
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Number of pages15
    ISBN (Electronic)978-951-38-8436-9, 978-951-38-8435-2
    Publication statusPublished - 2016
    MoE publication typeA4 Article in a conference publication
    EventBALTICA X - International Conference on Life Management and Maintenance for Power Plants - Cruise, Helsinki-Stockholm, Finland
    Duration: 7 Jun 20169 Jun 2016

    Publication series

    SeriesVTT Technology


    ConferenceBALTICA X - International Conference on Life Management and Maintenance for Power Plants
    Abbreviated titleBaltica X


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