A look at the major missions of the National Nuclear Security Administration:

Maintaining the Stockpile 

NNSA ensures the United States maintains a safe, secure, and reliable nuclear stockpile through the application of unparalleled science, technology, engineering, and manufacturing. 


NNSA works to prevent nuclear weapon proliferation and reduce the threat of nuclear and radiological terrorism around the world. The agency endeavors to prevent the development of nuclear weapons and the spread of materials or knowledge needed to create them.

Counterterrorism and Counterproliferation

NNSA plays a key role in preventing, countering, and responding to a terrorist or other adversary with a nuclear or radiological device.

Powering the Nuclear Navy

NNSA provides militarily effective nuclear propulsion plants and ensures their safe, reliable and long-lived operation.