National Nuclear Security Administration | Department of Energy

National Nuclear Security Administration | Department of Energy
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National Nuclear Security Administration
Missions
The U.S. Nuclear Weapons Stockpile
One of NNSA’s core missions is to ensure the United States maintains a safe, secure, and reliable nuclear stockpile through the application of unparalleled science, technology, engineering, and manufacturing. The Office of Defense Programs carries out NNSA’s mission to maintain and modernize the nuclear stockpile through the Stockpile Stewardship and Management Program.
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Nonproliferation
NNSA works to secure or dispose of dangerous nuclear material, and detect and control the proliferation of related WMD technology and expertise.
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about
Nonproliferation
October 1, 2025
Powering the Navy
The Naval Nuclear Propulsion Program provides militarily effective nuclear propulsion plants and ensures their safe, reliable and long-lived operation
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about
Powering the Navy
March 5, 2026
Counterterrorism and Counterproliferation
NNSA has a key role in U.S. efforts to prepare for, prevent, and respond to a terrorist or other non-state actor with a nuclear or radiological device
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about
Counterterrorism and Counterproliferation
July 28, 2025
Established by Congress in 2000, NNSA is a semi-autonomous agency within the U.S. Department of Energy that protects our nation by designing and delivering a safe, secure, reliable, and effective U.S. nuclear stockpile; forging solutions that enable global security and stability through nonproliferation, counterproliferation, and emergency response; providing nuclear propulsion to power a global U.S. Navy; and leveraging transformative technologies to address emerging challenges.
NNSA and our partners across laboratories, plants, and sites — collectively the Nuclear Security Enterprise — provide comprehensive nuclear security solutions that protect the American people, our allies, and our partners in a dynamic world.
About NNSA
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Latest News
Nonproliferation
Nuclear Security & Safety
NNSA Helps Armenia Become Free of Highly Radioactive Material
April 15, 2026
Modernize America’s Nuclear Stockpile
Nuclear Security & Safety
NNSA and Lawrence Livermore National Laboratory Advance Laser Upgrade for Nuclear Stockpile Mission Ahead of Schedule
April 13, 2026
Nuclear Security & Safety
NNSA issues Notice of Availability for the Draft Programmatic Environmental Impact Statement for its plutonium pit production mission
April 10, 2026
Nonproliferation
Nuclear Security & Safety
NNSA Removes High-Risk Cesium from South Carolina, Enhancing National Security
April 9, 2026
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Web Articles
Nonproliferation
Nuclear Security & Safety
NNSA transitions American-made molybdenum-99 effort to DOE Office of Energy Dominance Financing
April 9, 2026
Nonproliferation
Nuclear Security & Safety
NNSA and Texas A&M work together to strengthen U.S. environmental security
March 20, 2026
Nuclear Security & Safety
Nonproliferation
Making America safer: NNSA removed 68 radioactive devices in 2025, strengthening U.S. radiological security
February 4, 2026
Nuclear Security & Safety
Bridging NNSA with Congress and communities
January 29, 2026
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Offices
Congressional and Intergovernmental Affairs
March 18, 2026
Counterterrorism and Counterproliferation
July 28, 2025
Defense Nuclear Security
March 25, 2026
Emergency Management
March 5, 2026
General Counsel
November 25, 2024
Infrastructure
March 5, 2026
Nonproliferation
October 1, 2025
Nuclear Security & Safety
Nuclear Stockpile
The U.S. Nuclear Weapons Stockpile
March 5, 2026
Partnership and Acquisition Services
March 5, 2026
Powering the Navy
March 5, 2026
Supporting NNSA's missions
January 29, 2026
Working at NNSA
March 5, 2026
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