NRC estimated Fukushima Reactor 1 Core damage 13 hours after earthquake

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March 11th 2011 1600 EST USNRC Emergency Operations Center Status Update

b. High radiation associated with containment venting suggest core damage, the extent of which is not known

c. TEPCO appears to be taking extraordinary measures to supply water to the reactor, including using power supply trucks and batteries to supply power. The reactor vessel level is stabilized, possibly indicating a measure of control

d. TEPCO is venting containment under high radiation conditions; wind direction is to see

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Summary:

No additional information has been provided to reverse our previous hypothesis.

Assuming no mitigation, Unit 1 would lead to core damage in approximately 13 hours after the earthquake and significant offsite releases at [approximately 20 hours.

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March 11th 2011 1600 EST USNRC Emergency Operations Center Status Update

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