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National Nuclear Security Administration

The National Nuclear Security Administration works to ensure that the nation's stockpile of nuclear weapons is safe and secure. It also works to ensure the safety of naval nuclear reactors, is the first responder in case of nuclear emergency, and works on worldwide nuclear nonproliferation issues.

Contact the Agency or Department

Website: National Nuclear Security Administration

Address: 1000 Independence Ave SW
Washington, DC 20585

Phone Number: (202) 586-5000 (Energy Switchboard)

Toll-free: (800) 342-5363