Tue Mar 22, 2011 11:39am EDT, according to Reuters power has been restored to all six reactor buildings and TEPCO has managed to get a pump at one of them operating.
But the situation remains critical. TEPCO is concerned that the reactor core of Unit 1 is overheating. Its core temperatuere is 380-390 Celsius. The reactor was built to run at a temperature of 302 C.

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