They did not swim in. Two goldfish have been found swimming in slightly radioactive water in a lemonade pitcher inside a secure area of the Perry nuclear power plant, Perry, Ohio.

Security officers at nuclear facilities in North Carolina report concerns about liability if they should shoot an intruder. 

Los Alamos nuclear research facility has replaced several components of switches made in China for the sake of security concerns. 

A security test was being widely circulated among security officers at the Y-12 Nuclear Facility in Tennessee, where it was used as a study aid instead of a secret exam.

After Greenpeace activists broke into two Swedish nuclear power plants, the Swedish Environment Minister says it is clear that the plants' external security did not function. 

The troubled San Onofre nuclear power plant in California has been slapped with a violation following a May security lapse. 

The Energy Department is replacing guards and supervisors on duty last week when three peace activists breached perimeter fences at the "Fort Knox of uranium."

Explosives were discovered on a truck at the southwestern Ringhals atomic power station.

A Federal inspection uncovered serious security flaws at the San Onofre plant on the California coast.

The risk of multiple nuclear meltdowns in Japan triggered by Friday’s massive earthquake have highlighted calls for a safety review into nuclear plants around the world. How good are safety procedures? How quick are evacuation plans?