The Japanese government has expanded the long-term evacuation radius around the Fukushima nuclear plant to 30 kilometers (18.6 miles). The United States government is still asking to all their citizens inside an 80-kilometer radius to leave. That's almost 50 miles.
If the federal government followed the same policy in US soil, these would be the consequences in the three most populated cities: New York, LA and Chicago.
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The maps show the nuclear power plants closest to these cities. In the case of New York, more than 20 million people in the metro area would have to be evacuated, leaving the city deserted, from Long Island to the Bronx. If there were a Fukushima-level accident at Indian Point, including the release of massive quantities of highly radioactive water, the city would be even more affected because of the Hudson River.
In the Los Angeles urban center, 3.8 million people will be safe outside the evacuation areas from San Onofre and Diablo Canyon power plants, but the metro area (about 15 million people total) and the massive population in the cities around LA would be greatly affected.
Chicago would see at least 9.7 million people evacuated from the city and metro area.