Abstract
Uncertainties in material properties, manufacturing processes, loading conditions and damage mechanisms complicate the quantification of structural reliability. Probabilistic structure mechanical computing codes serve as tools for assessing leak- and break probabilities of nuclear piping components. Probabilistic fracture mechanical tools were compared in different benchmark activities, usually revealing minor, but systematic discrepancies between results of different codes. In this joint paper, probabilistic fracture mechanical codes are compared. Crack initiation, crack growth and the influence of in-service inspections are analyzed. Example cases for stress corrosion cracking and fatigue in LWR conditions are analyzed. The evolution of annual failure probabilities during simulated operation time is investigated, in order to identify the reasons for differences in the results of different codes. The comparison of the tools is used for further improvements of the codes applied by the partners.
Kurzfassung
Unsicherheiten in Werkstoffeigenschaften, Herstellungsprozessen, Lastbedingungen und Schädigungsmechanismen beeinflussen die Quantifizierung der Strukturzuverlässigkeit. Computercodes für probabilistische Strukturmechanik wurden als Werkzeuge zur Bewertung kerntechnischer Rohrleitungskomponenten entwickelt und in verschiedenen Benchmarks verglichen, in denen üblicherweise geringe, aber systematische Unterschiede zwischen verschiedenen Programmen gefunden wurden. In diesem Artikel werden bruchmechanische Analysewerkzeuge verglichen. Die Fallstudien umfassen Rissinitiierung, Risswachstum und wiederkehrende Prüfungen, Testfälle für Spannungsrisskorrosion und Ermüdung in Leichtwasserreaktor-Bedingungen werden analysiert, die Ergebnisse für den Verlauf der jährlichen Versagenswahrscheinlichkeit während des simulierten Betriebs werden verglichen, um die Ursachen für Unterschiede zu identifizieren. Die Vergleichsstudie wird für die Weiterentwicklungen der Programme verwendet.
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