"Security is a priority for the NRC - it is one of our strategic goals. Force-on-Force (FOF) exercises are an essential part of NRC's oversight of nuclear power plant security programs. One of the NRC's responses to September 11th was to upgrade the security forces at nuclear facilities around the country. To test the adequacy of the security forces, the NRC implemented a more robust FOF exercise program. FOF exercises assess a nuclear plant's physical protection measures to defend against the ' design basis threat (DBT).' The DBT characterizes the adversary against which plant owners must design physical protection systems and response strategies. The NRC periodically assesses the adequacy of the DBT and makes revisions as necessary. A full FOF exercise, spanning two weeks, includes both table-top drills and simulated combat between a mock commando-type adversary force and the nuclear plant security force. During the attack, the adversary force attempts to reach and simulate damage to key safety systems and components that protect the reactor's core (containing radioactive fuel) or the spent nuclear fuel pool, potentially causing a radioactive release to the environment. The nuclear power plant's security force, in turn, seeks to stop the adversaries from reaching the plant's equipment and causing such a release. These exercises include a wide array of federal, state, and local law enforcement and emergency planning officials in addition to plant operators and NRC personnel."
Nuclear Regulatory Commission: http://www.nrc.gov/