Comparative study of approaches to estimate pipe break frequencies

Kaisa Simola, Urho Pulkkinen, Heli Talja, Arja Saarenheimo, Päivi Karjalainen-Roikonen

    Research output: Book/ReportReport


    The report describes the comparative study of two approaches to estimate pipe leak and rupture frequencies for piping. One method is based on a probabilistic fracture mechanistic (PFM) model while the other one is based on statistical estimation of rupture frequencies from a large database. In order to be able to compare the approaches and their results, the rupture frequencies of some selected welds have been estimated using both of these methods. This paper highlights the differences both in methods, input data, need and use of plant specific information and need of expert judgement. The study focuses on one specific degradation mechanism, namely the intergranular stress corrosion cracking (IGSCC). This is the major degradation mechanism in old stainless steel piping in BWR environment, and its growth is influenced by material properties, stresses and water chemistry.
    Original languageEnglish
    PublisherNordic Nuclear Safety Research NKS
    Number of pages31
    ISBN (Print)87-7893-135-5
    Publication statusPublished - Dec 2002
    MoE publication typeD4 Published development or research report or study

    Publication series

    SeriesNKS Reports


    • probabilistic fracture mechanics
    • IGSCC
    • risk-informed in-service inspections
    • pipe break frequency


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