The estimation of piping failure frequency is an important task to support the probabilistic risk analysis and risk-informed in-service inspection of nuclear power plant systems (NPPs). Although various probabilistic models have been proposed in the literature, this paper describes a hierarchical or two-stage Poisson-gamma Bayesian procedure to analyze this problem. In the first stage, a generic distribution of failure rate is developed based on the failure observations from a group of similar plants. This distribution represents the interplant (plant-to-plant) variability arising from differences in construction, operation and maintenance conditions. In the second stage, the generic prior obtained from the first stage is updated by using the data specific to a particular plant, and thus a posterior distribution of plan specific failure rate is derived. The two-stage Bayesian procedure is able to incorporate different levels of variability in a more consistent manner. The proposed approach is applied to estimate the failure frequency using the OECD/NEA pipe leakage data for the U.S. nuclear plants.
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17th International Conference on Nuclear Engineering
July 12–16, 2009
Brussels, Belgium
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-4351-2
PROCEEDINGS PAPER
Bayesian Analysis of Piping Failure Frequency Using OECD/NEA Data Available to Purchase
M. Wang,
M. Wang
University of Waterloo, Waterloo, ON, Canada
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M. D. Pandey,
M. D. Pandey
University of Waterloo, Waterloo, ON, Canada
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J. Riznic
J. Riznic
Canadian Nuclear Safety Commission, Ottawa, ON, Canada
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M. Wang
University of Waterloo, Waterloo, ON, Canada
M. D. Pandey
University of Waterloo, Waterloo, ON, Canada
J. Riznic
Canadian Nuclear Safety Commission, Ottawa, ON, Canada
Paper No:
ICONE17-75366, pp. 459-467; 9 pages
Published Online:
February 25, 2010
Citation
Wang, M, Pandey, MD, & Riznic, J. "Bayesian Analysis of Piping Failure Frequency Using OECD/NEA Data." Proceedings of the 17th International Conference on Nuclear Engineering. Volume 1: Plant Operations, Maintenance, Engineering, Modifications and Life Cycle; Component Reliability and Materials Issues; Next Generation Systems. Brussels, Belgium. July 12–16, 2009. pp. 459-467. ASME. https://doi.org/10.1115/ICONE17-75366
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