6:10 福島県楢葉町のJヴィレッジに陸上自衛隊の戦車が到着。

(2011年03月21日)

6:37~8:41
4号機に約90トンを放水。

11:36
5号機・6号機の所内電源の一部を非常用電源から外部電源に切り替えた。

13:00前
5号機の原子炉の本格的な冷却を開始した。

14:30
1〜4号機放水口南側100mの地点で海水を採取したところ以下の放射性物質を検出した。

15:55~18:00
3号機の使用済み核燃料の貯蔵プールの上部とみられる場所から黒煙が上がる。放射線量は特に変化無し。

18:20~翌7:11
翌日7時11分、2号機原子炉建屋の山側の屋根の隙間から白煙が上がる。2号機では17日にも白煙が確認されたが、今回は別の場所とみられる。これにより、正門で1.932ミリシーベルト/時まであがったが、翌日7時30分頃に0.262ミリシーベルト/時まで戻った。また、2号機中央制御室への通電を前に機器や配線を確認したところ、原子炉に給水するポンプが故障していることがわかり、交換することとなった。

23:45
原発から南に16km離れた海水から、ヨウ素131が炉規則公示濃度限度比16.4倍の濃度で検出された。

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