Molten Core Concrete Interaction and Development of Core Catcher (2) Thermal shock effects for advanced high temperature ceramics
Molten Core Concrete Interaction and Development of Core Catcher (2) Thermal shock effects for advanced high temperature ceramics
著者:
マルタ シルベスター Marta ZIEMNICKA-SYLWESTER 奈良林 直 Tadashi NARABAYASHI 千葉 豪 Go CHIBA 辻 雅司 Masashi TSUJI 久保田 祥 Sho KUBOTA 宮脇 大地 Daichi MIYAWAKI
発刊日:
公開日:
Advanced ceramicsAl2O3corrosion resistanceSiCthermal shockThermite reaction ?P?DWhy advanced high temperature ceramicsTiCTiN
概要
Four monolithic refractory ceramics (Al2O3, SiC, TiC and TiN) were exposed to severe thermal shock caused by thermite reaction. Such experiments were intended to simulate the exposure of a core catcher to hot debris of melted core in nuclear reactor. Moreover, the chemical interactions between tested materials and products of thermite reaction were investigated by holding samples in laboratory furnace for 5 hours at 1000oC in air. None of the materials entirely withstand such sudden temperature rise, of approximately 1000oC/s, especially the sample made of Al2O3 peeled into small pieces under thermite mixture. Both TiN and TiC cracked in the central part, perpendicularly to the reaction front and proceeding heat wave. The best performance was observed in SiC sample, which is caused by the lowest thermal expansion coefficient. Considering the application of SiC in the construction of core catcher, research on thermal shock resistance improvements have to be performed.
