NNSA mission collage

About NNSA

Established by Congress in 2000, NNSA is a semi-autonomous agency within the U.S. Department of Energy responsible for enhancing national security through the military application of nuclear science. NNSA maintains and enhances the safety, security, and effectiveness of the U.S. nuclear weapons stockpile; works to reduce the global danger from weapons of mass destruction; provides the U.S. Navy with safe and militarily effective nuclear propulsion; and responds to nuclear and radiological emergencies in the United States and abroad.

NNSA at a glance.

The people running NNSA


NNSA facilities across the United States



How NNSA is structured


The president's fiscal priorities for NNSA


Contact us

How you can reach out to NNSA


Social media

NNSA's presence on Facebook, Twitter, InstagramYouTube, LinkedIn, and Flickr