[2M08-12] Reactor Pressure Vessel

[2M10] In-situ WB-STEM study of annealing process of neutron irradiation induced dislocation loops.

*Kenta Yoshida¹, Yufeng Du¹, Yusuke Shimada¹, Tomoaki Suzudo², Kazuto Arakawa³, Takeshi Toyoma¹, Koji Inoue¹, Somei Ohnuki⁴, Yasuyoshi Nagai¹ (1. Tohoku Univ., 2. JAEA, 3. Shimane Univ., 4. USTB)

Keywords:RPV, Radiation defect, Electron Microscopy

We developed the weak-beam scanning transmission electron microscopy for effective dislocation analysis in neutron irradiated steels. In this study, double-tilt heating stage was combined with the WB-STEM, then number density, size and Burgers vectors of dislocation loops had been successfully evaluated in post-irradiation annealing process, dynamically in nanometer scale.