March 11 was the anniversary of the earthquake, tsunami and the nuclear reactor(s) meltdown. This YouTube video, Understanding the accident of Fukushima Daiichi, will give you a good explanation of the sequence of events that caused the meltdown.
Just when you think you have done everything possible to protect the public, a combination of events unravels everything.
Eric Holdeman is a contributing writer for Emergency Management magazine and is the former director of the King County, Wash., Office of Emergency Management.