In the wake of a 8.9 magnitude earthquake,  the most powerful in 140 years in Japan:  Officials there have taken 12 reactors off line as a precaution.  The Fukushima Daiichi nuclear plant is currently experiencing cooling problems and a state of emergency has been declared.  The design used at the Fukushima site is the older BWR (Boiling Water Reactor) Designed by GE with Idaho National Laboritories in the 1950’s.