Were there more than one? And where were they?
sorry I mean the recent ones caused by the earthquakes.
i know they're by earthquakes and tsunamis but.. how exactly?
Yes there was more than one. You can find all your answers on Wall Street Journal (wsj.com), New York Times (nytimes.com), or from this Wikipedia article: http://en.wikipedia.org/wiki/Fukushima_I_nuclear_accidents