Sensitivity and uncertainty analyses of ex-vessel molten core cooling in a flooded cavity during a severe accident
Hwang, Byoungcheol Moriyama, Kiyofumi Hwang, Gisuk Kaviany, Massoud Lee, Mooneon Kim, Eunho Park, Hyun Sun
Hwang, Byoungcheol
Moriyama, Kiyofumi
Hwang, Gisuk
Kaviany, Massoud
Lee, Mooneon
Kim, Eunho
Park, Hyun Sun
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2018-03
Type
Article
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Keywords
Ex-vessel coolability,Debris particle bed,Particle agglomeration,Uncertainty analysis,Severe accident,Nuclear safety
Subjects (LCSH)
Citation
Hwang, Byoungcheol; Moriyama, Kiyofumi; Hwang, Gisuk; Kaviany, Massoud; Lee, Mooneon; Kim, Eunho; Park, Hyun Sun. 2018. Sensitivity and uncertainty analyses of ex-vessel molten core cooling in a flooded cavity during a severe accident. Nuclear Engineering and Design, vol. 328:pp 121-133
Abstract
Sensitivity and uncertainty analyses of molten core cooling under the ex-vessel phase of a severe accident of a light water reactor was performed with the COOLAP-I (COOLability Analysis Program-I) model, a parametric model considering one-dimensional heat transfer of a porous debris particle bed, covering a broad range of phenomena from the melt jet release to the long-term cooling process. COOLAP-I improved the previous version by including particle generation by the fuel-coolant interaction (FCI), and internal heat generation by the decay heat. With nine representative input parameters, an uncertainty analysis using Latin hypercube sampling (LHS) method with 300 samples were conducted, and the cooling characteristics such as total enthalpy, maximum temperature, decay heat ratio, and cake (a lump of connected particles) fraction, were examined for the elapsed time of up to 50 h. This analysis demonstrates the impacts of the water pool depth, the jet breakup-related parameters, and the accumulation area of the debris particles on the cake formation by particle agglomeration and analyzes the long-term coolability of debris particle bed in plant scale conditions.
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Publisher
Elsevier Ltd.
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Series
Nuclear Engineering and Design;v.328
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0029-5493