A prime example of redundancy with isolation is a nuclear power plant . The new ABWR has three divisions of Emergency Core Cooling Systems , each with its own generators and pumps and each isolated from the others . The new European Pressurized Reactor has two containment buildings , one inside the other . However , even here it is possible for a common mode failure to occur ( for example , in the Fukushima Daiichi Nuclear Power Plant , mains power was severed by the Tōhoku earthquake , then the thirteen backup diesel generators were all simultaneously disabled by the subsequent tsunami that flooded the basements of the turbine halls )
Tōhoku earthquake
2011 Tōhoku earthquake and tsunami
Common cause and special cause (statistics)