### Abstract

Piping failure frequencies are needed e.g. for
quantifying initiating event frequencies in probabilistic
safety assessments (PSA), and for the application of
quantitative risk-informed in-service inspection
methodology. The paper summaries different approaches to
estimate failure frequencies of piping at nuclear power
plants (NPPs). These approaches are the use of structural
reliability models, statistical estimation from operating
experience data and the use of expert judgement for
probability statements based on e.g. deterministic
analyses. We illustrate the use of these approaches with
a simple example. Further we discuss what kind of input
data is needed and evaluate their availability.

Original language | English |
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Title of host publication | Proceedings of the 25th ESReDA Seminar |

Number of pages | 13 |

Publication status | Published - 2003 |

MoE publication type | A4 Article in a conference publication |

Event | ESReDA 25th Seminar: Lifetime Management of Structures - Paris, France Duration: 17 Nov 2003 → 19 Nov 2003 |

### Seminar

Seminar | ESReDA 25th Seminar |
---|---|

Country | France |

City | Paris |

Period | 17/11/03 → 19/11/03 |

### Keywords

- risk analysis
- RI-ISI
- probability
- fracture mechanics
- database
- analysis code
- NPP
- piping

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## Cite this

Cronvall, O., Saarenheimo, A., Simola, K., & Talja, H. (2003). Approaches to estimate pipe failure rates for risk-informed in-service applications at nuclear power plants. In

*Proceedings of the 25th ESReDA Seminar*