Abstract
Lead-Bismuth Eutectic has good characteristics as a coolant for fast reactors, but it has a problem of polonium production. Some fundamental experiments were performed to investigate the characteristics of evaporation and adhesion of polonium. In the evaporation experiment, direct contact experiment of neutron irradiated lead-bismuth and water were performed. The results showed there was no clear evidence that evaporation of polonium was increased remarkably by the direct contact. In the adhesion experiment, chemical form of evaporated polonium was discussed from the adhesion characteristics. By these experiments, some fundamental knowledge were obtained related to evaporation of polonium from lead-bismuth eutectic.
