東京電力福島第一原発と同型の「沸騰水型」原発について、原子力規制委員会が再稼働審査の体制強化に乗り出したことが分かった。審査担当の全五チームのうち、三チームが割り振られた。これまで審査に正式合格した原発は全て「加圧水型」だが、新体制により、近く正式合格する見通しの東電柏崎刈羽原発(新潟県)を含め、沸騰水型の再稼働に向けた手続きが進みそうだ。
沸騰水型は東日本に多く立地し、加圧水型は西日本に多い。沸騰水型は原子炉格納容器が比較的小さく、内部の温度や圧力が上昇しやすい欠点があり、事故リスクを懸念する声も予想される。
これまで沸騰水型の審査は二チームが担当していたが、第一原発と同型のため安全対策工事に時間を要したり、敷地の地盤が悪く、対策が必要だったりで、進まなかった。今年十月に柏崎刈羽6、7号機が事実上の合格となり、審査のモデルケースができ、電力各社の審査対応が進む可能性が出てきた。
規制委はこうした状況も踏まえ、審査で難関とされる基準地震動(耐震設計の目安となる揺れ)が決まった東北電力女川2号機(沸騰水型、宮城県)については、これを中心に審査するチームが必要と判断。約二十人の加圧水型のチームを担当替えした。
沸騰水型は三チームとなり、それぞれ柏崎刈羽、女川、日本原子力発電東海第二(茨城県)をメインに審査に当たる。
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A nuclear power plant in Byron, Illinois. Taken by photographer Joseph Pobereskin (http://pobereskin.com). カレンダー
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