Remember those remaining US nuclear reactors of the same design as Fukushima? Some are in Alabama.
Reuters:

All three units at TVA’s 3,274-megawatt Browns Ferry nuclear plant in Alabama tripped about 5:30 EDT (2230 GMT) after losing outside power to the plant, a spokesman for the U.S. Nuclear Regulatory Commission said.

A TVA spokeswoman said the station’s backup power systems, including diesel generators, started and operated as designed. External power was restored quickly to the plant but diesel generators remained running Wednesday evening, she said.

The Browns Ferry units are among 23 U.S. reactors that are similar in design to the crippled Fukushima Daiichi nuclear plant in Japan where backup generators were swept away in the tsunami that followed the massive earthquake on March 11.

More on Browns Ferry’s potential vulnerabilities at Washington’s Blog.