福島第一原発(1F)における金属系燃料デブリ成分の凝固・再溶融機構の検討

Solidification and re-melting mechanisms of metallic debris in 1F

墨田 岳大   

Sumita, Takehiro

Fundamental understanding of the high-temperature interaction between stainless steel and BC is indispensable for estimating and characterizing the fuel debris generated during severe accidents of Fukushima Dai-ichi Nuclear Power Station (FDNPS, also referred to as "1F") in Japan. This study aims at systematically characterizing the solidified products of molten SUS-BC mixtures by powder X-ray diffraction (PXRD), scanning electron microscopy- energy dispersive X-ray spectroscopy (SEM-EDS), and thermogravimetry-differential thermal analysis (TG-DTA) with a range of the BC content relevant to the fuel debris composition expected at FDNPPs, in order to elucidate the solidification and re-melting mechanisms.