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福島第1原発:1号機圧力容器に穴 工程表の前提崩れる

福島第1原発:1号機圧力容器に穴 工程表の前提崩れる

東京電力福島第1原発1号機で燃料棒を収めている圧力容器が損傷し、大量の水漏れが起きていることが12日、明らかになった。東電は同日夕、圧力容器の底に合計で数センチ相当の複数の穴が開いている可能性もあるとの見解を示した。17日には同原発事故の収束までの課題を示した新しい工程表を発表するが、現在の工程表で盛り込まれていなかった「圧力容器の破損」という事態に、計画の見直しを迫られることは必至だ。【中西拓司、足立旬子、岡田英】

 先月17日に示された工程表は、6~9カ月以内に原子炉の温度を100度未満の「冷温状態」にすることを目標に、3カ月以内に行う対策の上位に燃料域上部まで格納容器を水で満たす「水棺」の実施を挙げている。燃料のある圧力容器(360立方メートル)に注水し、そこから水をあふれさせて格納容器(7400立方メートル)に冠水させるという手法だ。

 ただし、水棺を実現するためには格納容器とその内部にある圧力容器がいずれも健全な状態であることが前提となる。工程表では、1号機の圧力容器破損の可能性については触れられておらず、格納容器についても「微量の蒸気の漏えい」を指摘しているだけだ。

 東電は燃料を冷やすため、毎日150立方メートルの水を圧力容器に注水し、これまで累計1万立方メートルを入れた。しかし、高さ20メートルある圧力容器の水位は高くても4メートルで、格納容器から漏水していることも指摘されている。

 圧力容器の底には、燃料の核反応を止める制御棒を駆動させるための装置が貫通しており、溶けた燃料の熱で溶接部に穴が開いた可能性がある。注水量と貯水量との比較などから、東電は穴は複数あり、大きさの合計は数センチ程度と推定した。また、大量の水や水蒸気が圧力容器の損傷部から格納容器側に漏れ出し、さらにその水が格納容器につながっている圧力抑制プールやタービン建屋に漏れ出している恐れがある。

 1号機は2、3号機に比べて冷却に向けた準備が最も進んでいた。「モデル」とされた1号機の新たなトラブルは「6~9カ月」とした日程に影響を与えそうだ。

 原子力技術協会の石川迪夫(みちお)・最高顧問は、燃料棒溶融について「冷やされているので(核分裂が連続する)再臨界などの可能性はない」としながら、「燃料棒が溶け落ちたという点では、米国のスリーマイル島原発事故(79年)と同じ状況だ。圧力容器の内部は非常に高温で、溶けた燃料棒は圧力容器の下部でラグビーボールのような形状に変形しているのではないか」とみている。

毎日新聞 2011年5月13日 0時56分(最終更新 5月13日 1時19分)
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圧力容器の底には、元々「穴」が開いています。マスコミが、圧力容器の形状について綺麗に密閉されたフラスコ状のイラストを使うから誤解を招くのだと思います。

福島第一原発は沸騰水型原子炉(BWR)なので、圧力容器の下から制御棒を挿入するため、制御棒を出し入れするための出入り口が底に多数あります。設計上密閉されている筈ではありますが、元々、底には「穴」が開いています。ゆえに、何らかの事故が起きて、圧力容器の底に溶融した燃料棒や内部構造物等の「デブリ」が溜まって高温状態になると水が漏れるのは構造上必然と言えます。

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Comments

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今177回国会(6月22日閉会予定)に提出するため、6月初旬ごろで一度募集を締め切る予定です。

何とぞ宣伝をよろしくお願い致します。

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多くの方へ
訴えるべき重要なことを書いておきますので正しい方向へ導いてください
私感ですが経済産業省などに利権を発生させた方がよいでしょう
1:児童の定義は13歳未満が正しい(グローバルスタンダード、少子化を考える)
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上記の1、2に該当のみブロッキングする
A:ネットではブロッキング機能
B:テレビにブロッキング機能をつける
またはDVDプレーヤーなどにブロッキング機能をつける
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以上、三年後をめどに検討すること

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