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High-temperature interaction of silicon carbide with steam above 1600$$^{circ}$$C

Pham, V. H.; 永江 勇二; 倉田 正輝

no journal, , 

Silicon carbide (SiC) has recently attracted much attention as a potential material for accident tolerant fuel cladding. High-temperature interaction of SiC at temperature range below 1600$$^{circ}$$C has been studied by various authors. As expected for enhanced accident tolerant fuel cladding, high-temperature interaction of SiC must be also investigated at temperatures above 1600$$^{circ}$$C. In this study, we investigate high-temperature interaction of SiC in steam at temperature range of 1700$$sim$$1800$$^{circ}$$C using laser heating furnace. The oxidation kinetics is then studied based on the weight change and observation on cross-sectioned surface of tested sample using field emission scanning electron microscope. Off-gas measurement of hydrogen (H$$_{2}$$) and carbon monoxide (CO) generated during the test was also conducted via sensor gas chromatography.

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Recession of ZrO$$_{2}$$ scale on fuel tube cladding by the melt of control rod assemble

中島 正太郎*; 松浦 傑*; 南口 誠*; 倉田 正輝; Pham, V. H.

no journal, , 

For a better understanding of the Fukushima-Daiichi Nuclear Power Plant accident, a reaction model of core melting process is very important. In this study, oxidized Zry plates were soaked into molten SS-B$$_{4}$$C mixture and heated into Ar gas at 1200$$^{circ}$$C. Recession of ZrO$$_{2}$$ scale was observed in the both cases. An oxygen solid solution region in the Zry sample was observed below ZrO$$_{2}$$ scale, although it was not observed in Zry oxidized at 600$$^{circ}$$C in high temperature steam conditions. When oxygen supply from the surrounding was halted, ZrO$$_{2}$$ scale can be reduced at high temperature such as 1200$$^{circ}$$C by oxygen dissolution into Zry inside.

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