According to the International Nuclear Event Scale, a level 7 nuclear accident involves “widespread health and environmental effects” and the “external release of a significant fraction of the reactor core inventory.”
The level 7 assessment has been applied only to the disaster at Chernobyl in the former Soviet Union
10,000 terabecquerels of radiation per hour was released from the plant into the environment for several hours in the aftermath of the March 11 earthquake and tsunami.
The scale of the radiation leak has since dropped to under 1 terabecquerel per hour,
Japan Plans Wider Evacuation Around Fukushima Nuclear Plant - NYTimes.com
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