"In early 2009 a team of terrorists managed to enter a nuclear-power plant in the American South armed with machine guns and grenade launchers. After breaking through chain-link and barbed-wire gates, they battled with the plant’s guards. Those terrorists who weren’t killed were able to disable a critical component of the plant’s operating hardware. A meltdown of the reactor core looked imminent, as did the release of radioactive material from waste-storage pools located on-site. The surrounding area faced catastrophic fallout.
Everything up to that point actually happened—sort of. In reality, the attackers were a group of highly trained government operatives—including security consultants and military members on leave—posing as terrorists. Every three years, such teams “attack” each of the country’s 104 nuclear-power plants to find weak spots in security. The raids are carefully choreographed: plant managers are given two months’ notice to prepare the guards, and the intruders follow a prearranged script to evade them. Still, eight times out of roughly 100 attempts over the past five years, the mock terror teams have successfully broken through those defenses."