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Ishibashi, Ryo*; Tanabe, Shigetada*; Kondo, Takao*; Yamashita, Shinichiro; Nagase, Fumihisa
Proceedings of 2017 Water Reactor Fuel Performance Meeting (WRFPM 2017) (USB Flash Drive), 10 Pages, 2017/09
For improving the corrosion resistance of silicon carbide (SiC) in boiling-water-reactor environments, corrosion-resistant coatings on SiC were evaluated. Due to its hydrogen-generation rate and reaction heat being lower than those of conventional Zircaloy, SiC is expected to be an appropriate material for accident-tolerant fuels. However, there are still many critical issues with the practical application of SiC fuel cladding and fuel channel boxes, one of which is hydrothermal corrosion. Silicon carbide is chemically stable, but silicon oxide formed by oxidation of SiC dissolves in high temperature water. Although the rate of SiC dissolution is very small, the dissolution must be suppressed to comply with regulations for dissolved silica concentration in reactor coolant. In this study, the corrosion behavior of candidate coatings for SiC substrates were evaluated before and after exposure to unirradiated high-purity-water environments.
Ishibashi, Ryo*; Ikegawa, Tomohiko*; Tanabe, Shigetada*; Yamashita, Shinichiro; Fukahori, Tokio
no journal, ,
For the purpose of improving corrosion resistance of silicon carbide (SiC) in boiling water reactor (BWR) environments, corrosion resistant coatings to SiC substrate were evaluated. Due to its lower hydrogen generation rate and lower reaction heat in comparison with a conventional zircaloy, SiC is expected to be a proper material for accident tolerant fuel. On the other hand, there are still a lot of critical issues left for the practical application of SiC fuel cladding and fuel channel box, one of which is hydrothermal corrosion. In this study, corrosion behavior of candidate coatings to SiC substrate and joint portion were evaluated in unirradiated high purity water environments.