Study of simulated fuel debris properties by spectroscopic analysis from micro to bulk scale

Endo, Ryo*; Akiyama, Daisuke*; Yomogida, Takumi   ; Kirishima, Akira*

In the Fukushima Daiichi Nuclear Power Plant accident, fuel debris were formed by reaction of molten fuel and reactor structural materials. The fuel debris is composed of many elements and crystalline phases. Therefore, it is inevitable to study various solid phase for debris analysis. In this study, we focused on (U, Zr) O solid solution, which is assumed to be formed in the reactor by the reaction of molten nuclear fuel (UO) and oxide of cladding components (ZrO). The morphology of (U, Zr) O solid solution was studied by X-ray diffraction (XRD) in macro-scale analysis, and by scanning electron microscope-energy dispersive X-ray spectroscopy (SEM-EDX) and micro-Raman spectroscopy (MRS) in micro-scale analysis.