[1I14-18] Fuel & FP Behavior in Accident

[1I18] Environment inside Unit 2 at the time of the Fukushima nuclear accident inferred from radiocesium-bearing microparticles

*Taiga Okumura¹, Noriko Yamaguchi², Hiroki Suga¹, Yoshio Takahashi¹, Toshihiro Kogure¹ (1. UTokyo, 2. NARO)

Keywords:radiocesium-bearing microparticle, CsMP, silicate glass, Fukushima nuclear accident, TEM, STEM, EDS, EELS, STXM

Radiocesium-bearing microparticles (CsMPs) generated inside the reactor Unit 2 at the time of the Fukushima nuclear accident were investigated using TEM/STEM and STXM. As a result, we obtained the following three result: Fe in CsMPs is mainly ferrous iron; CsMPs contain a few percent of Na; CsMPs do not contain B. These results may impose restrictions on the reactor environment.