[3B09-13] Light Water Reactor Safety Assessment

[3B12] The characteristics of concrete after high temperature exposures simulating severe accident

*Nhut Vu Luu¹, Thi Mai Dung Do¹, Kenta Murakami¹, Masahide Suzuki¹, Tomonori Yamada², Shibata Takuya² (1. Nagaoka University of Technology, 2. Japan Atomic Energy Agency)

Keywords:severe accident, thermal degradation, ultrasonic pulse velocity

This study aims to investigate the thermal degradation in concrete specimens by using microstructural and chemical analysis techniques, and apply ultrasonic method to detect the thermal damage. Ultrasonic test successfully detected the damage level in concrete samples and an empirical relationship between ultrasonic velocity and mechanical properties was obtained.