[…]
誤操作で停止したのは、格納容器から窒素ガスを排出するファン。東電は窒素ガスに混じる放射性物質を調べ、核燃料の状態を確認しているが、ファンが止まってデータを取得できなくなった。
炉心溶融した同原発１～３号機では、核燃料が何らかの理由で再臨界し、水素が発生して爆発するのを防ぐため、窒素ガスを注入して格納容器の水素濃度を下げている。
東電によると、同日午前１１時１２分頃にファンが停止したが、午後２時３０分に監視できる状態に戻った。
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