To amend the Department of Energy Organization Act to establish a Nuclear Security Administration and an Office of Under Secretary for National Security in the Department of Energy.

[AI summary unavailable — showing source text] Amends the Department of Energy (DOE) Organization Act to establish the Nuclear Security Administration within DOE, headed by an Administrator who shall be accountable directly to the Secretary of Energy (the Secretary). States that the Under Secretary for National Security shall serve as the Administrator. Identifies the Administrator's duties to: (1) manage a program designed to ensure the safety and reliability of the nuclear weapons stockpile; (2) direct nuclear weapons production facilities and the national laboratories; and (3) be primarily responsible for other DOE national security functions involving nuclear weapons research and development. Directs the Secretary to assign to the Administrator direct authority over and responsibility for the nuclear weapons production facilities and the national laboratories. Establishes in DOE an Under Secretary for National Security who is specially qualified to: (1) manage a program designed to ensure the safety and reliability of the nuclear weapons stockpile, production facilities, and the national laboratories; and (2) implement the functions of the Administrator of the Nuclear Security Administration.…