Analysis on characteristic of hydrogen gas dispersion and evaluation method of blast overpressure in VHTR hydrogen production system

Murakami, Tomoyuki; Terada, Atsuhiko  ; Nishihara, Tetsuo ; Inagaki, Yoshiyuki; Kunitomi, Kazuhiko 

The Very High Temperature Reactor (VHTR) is expected to be the best energy source for the hydrogen production. This system will handle a large amount of hydrogen which is combustible gas. It is one of the most important subjects in design with this system to assure the safety of the reactor system against the damage due to fire and the explosion accident. This analysis provides with quantitative information about correlation between the combustible gas movement distance and various parameters which influences the gas dispersion. Based on these analytical results, we propose the best method which is able to evaluate damage of the nuclear plant by blast overpressure. This method will be used efficiently for the safety evaluation for the future VHTR hydrogen production System.