AVELAR, ALAN M.CAMARGO, FABIO deSILVA, VANESSA S.P. daGIOVEDI, CLAUDIAABE, ALFREDOMOURAO, MARCELO B.2023-04-242023-04-242023AVELAR, ALAN M.; CAMARGO, FABIO de; SILVA, VANESSA S.P. da; GIOVEDI, CLAUDIA; ABE, ALFREDO; MOURAO, MARCELO B. Effectiveness of Ni-based and Fe-based cladding alloys in delaying hydrogen generation for small modular reactors with increased accident tolerance. <b>Nuclear Engineering and Technology</b>, v. 55, n. 1, p. 156-168, 2023. DOI: <a href="https://dx.doi.org/10.1016/j.net.2022.09.002">10.1016/j.net.2022.09.002</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/33996.1738-5733http://repositorio.ipen.br/handle/123456789/33996This study investigates the high temperature oxidation behaviour of a Ni–20Cr-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.156-168openAccessfuel-cladding interactionsnickel alloysstainless steelsoxidationtemperature range 0400-1000 kcladdingArtigo de periódico15510.1016/j.net.2022.09.00286.875.00