Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8083872 | Nuclear Engineering and Technology | 2018 | 18 Pages |
Abstract
To ensure the structural integrity of nuclear power plants, it is essential to predict the lifetime of Alloy 182 weld, which is used for welding in nuclear reactors. The lifetime of Alloy 182 weld is directly related to the crack initiation time. Owing to the large time scatter in most crack initiation tests, a probabilistic model, such as the Weibull distribution, has mainly been adopted for prediction. However, since statistically more advanced methods than current typical methods may be applied, we suggest a statistical procedure for parameter estimation of the crack initiation time of Alloy 182 weld, considering right-censored data and the covariate effect. Furthermore, we suggest a procedure for uncertainty evaluation of the estimators based on the bootstrap method. The suggested statistical procedure can be applied not only to Alloy 182 weld but also to any material degradation data set including right-censored data with covariate effect.
Related Topics
Physical Sciences and Engineering
Energy
Nuclear Energy and Engineering
Authors
Jae Phil Park, Chanseok Park, Young-Jin Oh, Ji Hyun Kim, Chi Bum Bahn,