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

水素挙動解析システムの開発; オープンソースコードによる解析システムの概要とその検証

松本 昌昭*; 芦田 高規*; 河合 理城*; 寺田 敦彦  ; 日野 竜太郎

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

福島第一原子力発電所事故では、被覆管の酸化によって発生した大量の水素が原子炉建屋に漏洩し、水素爆発が引き起こることで環境に深刻な影響を与えるに至った。原子力発電所の安全対策のさらなる向上に向けて、特にシビアアクシデント時における、拡散流動, 燃焼を考慮した水素挙動を予測するオープンソースコードシステムの開発を進めてきた。本報では、開発を進めているシステムの概要とISP47 TOSQAN試験等の予備解析にて良好な結果が得られたことを報告する。

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.

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