The best estimate plus uncertainty (BEPU) method is recommended by IAEA for nuclear safety analysis. Most of the existing BEPU methodologies rely on the uncertainty propagation of input parameters, while uncertainties of the constitutive models in best estimate codes tend not to be valued or even neglected. A structural method is proposed in this paper to quantify the uncertainties of the constitutive models. Different constitutive models will be classified according to the characteristics and corresponding method could be utilized for each model based on the method. Specific uncertainty quantification (UQ) methods adopted in this paper include the non-parametric curve estimation method, inverse method and design of experiment (DOE) method, and a model selection technique is adopted to opt the optimal model among all alternative models. The structural method is applied to the uncertainty evaluation of LOFT LP-02-6 experiment. Important models are identified, uncertainties of these models are quantified and propagated to the peak cladding temperature (PCT) through code calculations. Uncertainty of the PCT is quantified and the result shows that the calculated values could well envelop the experimental value.
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2018 26th International Conference on Nuclear Engineering
July 22–26, 2018
London, England
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-5153-1
PROCEEDINGS PAPER
Investigation on Methods for Uncertainty Quantification of Constitutive Models and the Application in BEPU
Qingwen Xiong,
Qingwen Xiong
Xi'an Jiaotong University, Xi'an, China
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Junli Gou,
Junli Gou
Xi'an Jiaotong University, Xi'an, China
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Jianqiang Shan
Jianqiang Shan
Xi'an Jiaotong University, Xi'an, China
Search for other works by this author on:
Qingwen Xiong
Xi'an Jiaotong University, Xi'an, China
Junli Gou
Xi'an Jiaotong University, Xi'an, China
Jianqiang Shan
Xi'an Jiaotong University, Xi'an, China
Paper No:
ICONE26-81425, V009T16A025; 8 pages
Published Online:
October 24, 2018
Citation
Xiong, Q, Gou, J, & Shan, J. "Investigation on Methods for Uncertainty Quantification of Constitutive Models and the Application in BEPU." Proceedings of the 2018 26th International Conference on Nuclear Engineering. Volume 9: Student Paper Competition. London, England. July 22–26, 2018. V009T16A025. ASME. https://doi.org/10.1115/ICONE26-81425
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