Development of hydrogen behavior simulation code system; Code system with open source code and validation

Matsumoto, Masaaki*; Ashida, Takaki*; Kawai, Masaki*; Terada, Atsuhiko  ; Hino, Ryutaro

In the Fukushima Daiichi Nuclear Power Station (NPS) accident, hydrogen was generated by oxidation reaction of the cladding and water etc, then leaked into the NPS building, and finally led to occurrence of hydrogen explosion in the building. This resulted in serious damage to the environment. To improve the safety performance of the NPS, especially on the hydrogen safety under severe accident conditions, a simulation code system has been developed to analyze hydrogen behaviors including diffusion, combustion. This developing system consists of open source code in order to support various hydrogen user groups of students, researchers and engineers. Preliminary calculated results obtained with above mentioned tools, agreed well with ISP47 TOSQAN test-data.