Known containment leaks exist at US nuclear power plants across the country. Seismic engineering failed at Fukushima reactor #1 and at the reactor #4 fuel pool. Battery backup power is inadequate against an extended blackout lasting more than eight hours.
Arnie Gundersen of Fairewinds Associates explains below
The Implications of the Fukushima Accident on the World’s Operating Reactors from Fairewinds Associates on Vimeo.