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外部流のある部分開放空間中の漏洩水素の拡散挙動に関する数値解析

Numerical simulation on effects of wind on dispersion of hydrogen leaked in a partially open space

寺田 敦彦  ; 永石 隆二 

Terada, Atsuhiko; Nagaishi, Ryuji

福島第一原子力発電所事故で発生する燃料デブリ等の含水放射性廃棄物の保管管理においては、含水する水の放射線分解による水素発生に伴う水素爆発燃焼リスクの低減が重要である。本研究では、これらの対策の妥当性検証に向けたシミュレーション技術の開発と新たな滞留防止技術開発の一環として、部分開放空間の室外雰囲気による滞留水素濃度への影響等についてシミュレーションを行い、風況(風向,温度)条件において室内の水素濃度が上昇するリスクを明らかにした。

With a storage containing wet radioactive waste such as fuel debris, it is important to reduce the risk of explosion and combustion due to hydrogen generated by radiolysis of water. This study, as a part of the development of simulation technologies for verification of reduction countermeasures and proposal of new countermeasures, conducted a trial simulation of the hydrogen concentration behavior in partially open space. The simulation using a CFD code focuses on hydrogen dispersion by ventilation in a situation where the wind is blowing outdoors. It was found that the hydrogen concentration distribution was affected by the wind direction and temperature conditions around partially open space.

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