Effectiveness of Ni-based and Fe-based cladding alloys in delaying hydrogen generation for small modular reactors with increased accident tolerance

Avelar Alan Matias; de Camargo Fábio; da Silva Vanessa Sanches Pereira; Giovedi Claudia; Abe Alfredo; Mourão Marcelo Breda

doi:10.1016/j.net.2022.09.002

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자료유형: 학술저널

저자정보: Avelar Alan Matias (University of S~ao Paulo) de Camargo Fábio (Corifeu de Azevedo Marques) da Silva Vanessa Sanches Pereira (Corifeu de Azevedo Marques) Giovedi Claudia (Nuclear and Energy Research Institute University of S~ao Paulo) Abe Alfredo (Nuclear and Energy Research Institute University of S~ao Paulo) Mourão Marcelo Breda (University of S~ao Paulo)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제55권 제1호

발행연도: 2023.1

수록면: 156 - 168 (13page)

DOI: 10.1016/j.net.2022.09.002

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This study investigates the high temperature oxidation behaviour of a Nie20Cr-1.2Si (wt.%) alloy in steam from 1200 C to 1350 C by Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDS) and X-ray Diffraction (XRD). The results demonstrate that exposed Ni-based alloy developed a thin oxide scale, consisted mainly of Cr2O3. The oxidation kinetics obtained from the experimental results was applied to evaluate the hydrogen generation considering a simplified reactor core model with different cladding alloys following an unmitigated Loss- Of-Coolant Accident (LOCA) scenario in a hypothetical Small Modular Reactor (SMR). Overall, experimental data and simulations results show that both Fe-based and Ni-based alloys may enhance cladding survivability, delaying its melting, as well as reducing hydrogen generation under accident conditions compared to Zr-based alloys. However, a substantial neutron absorption occurs when Ni-based alloys are used as cladding for current uranium-dioxide fuel systems, even when compared to Fe-based alloys.

#Nickel alloys #Stainless steel #High-temperature oxidation #Fuel cladding #Hydrogen generation #Accident tolerant fuel cladding

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