Research on the stability of fuel debris consisting of oxides and alloys, 11; Synthesis and evaluation of simulated fuel debris in the UO-Zr-SS system

Akiyama, Daisuke*; Kirishima, Akira*; Sato, Nobuaki*; Sasaki, Takayuki*; Watanabe, Masayuki   ; Kumagai, Yuta   ; Kusaka, Ryoji  

In the accident at TEPCO's Fukushima Daiichi Nuclear Power Station, it is considered that the molten fuel reacted with zircaloy of the cladding tube and alloys containing iron as the main component, such as stainless steel, at high temperatures to generate fuel debris. For the removal, processing, and disposal of the debris in the future, it will be important to predict the properties of the debris. Therefore, in this study, simulated fuel debris containing Zr or ZrO and the constituent elements of stainless steel was prepared, and structural analysis was performed using XRD and SEM-EDX. We also evaluated the solid phase state after immersing the simulated debris in pure water or seawater.