Computation of conditional large early release probabilities of piping components

    Research output: Book/ReportReport


    In-service inspections are applied to safety important pipe components in nuclear power plants (NPPs) to ensure their structural reliability. In risk-informed in-service inspections (RI-ISI), these inspections are planned according to risk importance of piping components. The quantitatively computed risk of a piping component combines the probability of the failure and the associated consequences. This report focuses on estimating the consequences of piping component failures. Conditional large early release probability (CLERP) is used as the consequence measure. It is demonstrated how CLERP values of piping component failures can be calculated automatically in the new RI-ISI feature of probabilistic risk assessment (PRA) software FinPSA. The RI-ISI feature enables detailed modelling of the consequences of piping component failures without complicating the PRA model itself.
    Original languageEnglish
    PublisherVTT Technical Research Centre of Finland
    Number of pages18
    Publication statusPublished - 2 Nov 2017
    MoE publication typeD4 Published development or research report or study

    Publication series

    SeriesVTT Research Report


    • risk-informed in-service-inspections
    • probabilistic risk assessment
    • nuclear safety
    • pipe


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