[2F10-13] Fuel Debris 6

[2F12] Development of ultramicro analysis technology for fuel debris analysis

(24) 3D-FIB-SEM measurement of inner surface precipitates in fuel debris

*Kenta Yoshida¹, Hotaka Miyata¹, Satoru Matsuo¹, Hiroyuki Kazama², Yoshiya Homma¹, Kenji Konashi¹, Yausyoshi Nagai¹ (1. Tohoku Univ., 2. JAEA)

Keywords:Simulated fuel debris, (Zr,U)O2, TEM, Three-dimensional observation

In order to estimate the temperature and oxygen atmosphere at the time of fuel debris formation and to obtain the structural and chemical composition necessary to evaluate the physical properties of fuel debris, the three-dimensional morphology of a 25% Fe-doped (U, Zr)O₂ fuel debris was investigated by using a 3D-FIB-SEM. The chemical composition and atomic structure of Fe and ZrO₂ particles deposited on the inner surface of the debris were characterized using nanoscale analytical microscopy with a spherical aberration-corrected transmission electron microscope (AC-TEM).