Comparison of approaches for estimating pipe rupture frequencies for risk-informed in-service inspections

Kaisa Simola (Corresponding Author), Urho Pulkkinen, Päivi Karjalainen-Roikonen, Arja Saarenheimo

    Research output: Contribution to journalArticleScientificpeer-review

    16 Citations (Scopus)


    This paper 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 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. 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
    Pages (from-to)65 - 74
    Number of pages10
    JournalReliability Engineering and System Safety
    Issue number1
    Publication statusPublished - 2004
    MoE publication typeA1 Journal article-refereed


    • risk-informed in-service inspection
    • fracture mechanics
    • fracture
    • probabilistic fracture mechanics
    • pipe break frequencies
    • intergranular stress corrosion cracking
    • nuclear safety


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