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| NKS Programme Area: | NKS-R | | Research Area: | Risk analysis | | Report Number: | NKS-79 | | Report Title: | Comparative Study of Approaches to Estimate Pipe Break Frequencies | | Activity Acronym: | SOS-2.1 | | Authors: | Kaisa Simola, Heli Talja, Arja Saarenheimo, Urho Pulkkinen, Päivi Karjalainen-Roikonen | | Abstract: | 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. | | Publication date: | 01 Dec 2002 | | ISBN: | ISBN: 87-7893-135-5 | | Number of downloads: | 3528 | | Download: |  NKS-79.pdf |
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