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「40年超原発」再稼働へ立ちはだかる壁 安全性懸念、行き詰まる中間貯蔵先探し via 毎日新聞

 運転開始から40年を超える関西電力の美浜原発3号機(福井県美浜町)と高浜原発1、2号機(同県高浜町)の再稼働に向け、地元の同意プロセスが進んでいる。ただ、老朽原発の安全性には懸念の声が根強いほか、県が同意の前提とする使用済み核燃料の「県外」での中間貯蔵先探しも行き詰まったまま。国内初の「40年超原発」の再稼働には、高いハードルが立ちはだかる。

「原発から抜けられない町」、本心は「ノー」

 関電は経営面から一日も早い再稼働を目指し、美浜3号機を2021年1月、高浜1、2号機を3月以降に再稼働させる工程を示しているが、実現のめどは立っていない。

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しかし、安全面で課題も指摘されてきた。関電が09年に高浜1号機で実施した検査では、60年運転時点の脆性(ぜいせい)遷移温度(圧力容器の劣化を示す指標)の予想値が97度となり、廃炉以外の原発で最高を記録。この値が100度程度に高いと圧力容器が破損する恐れがあるとされ、長沢啓行・大阪府立大名誉教授(生産管理システム工学)は「過去の検査に比べ09年の結果を見ると脆化(もろくなる)スピードが速まり、余裕がなくなった。次の検査でさらに予想値が高くなる可能性がある」と指摘。関電は「脆化の程度が大きいのは事実だが、地震や事故に耐えられることは確認している」と反論する。

 再稼働には県や原発の立地自治体の首長と議会の同意が必要とされる。「再稼働への理解と協力をお願い申し上げる」。経済産業省資源エネルギー庁の保坂伸長官は20年10月16日、福井県庁などを訪れ、40年超原発3基の再稼働への協力を県などに要請した。これを受け、立地自治体である高浜、美浜両町の議会は11~12月に再稼働を求める請願を相次いで採択し、早々に同意。両町長も近く同意の意思を示す見通しだ。

[…]

原文

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