How Safe Are U.S. Nuclear Reactors? Lessons from Fukushima

The U.S. has reactors of the same designs that melted down at Fukushima Daiichi, but regulators hope changes could prevent a repeat of Japan's nuclear crisis

By David Biello
 
http://www.scientificamerican.com/article.cfm?id=how-safe-are-old-nuclear-reactors-lessons-from-fukushima