The Secretary of Energy may carry out a program to undertake an accelerated, comprehensive worldwide effort to mitigate the threats posed by high-risk, proliferation-attractive fissile materials, radiological materials, and related equipment located at sites potentially vulnerable to theft or diversion.
Amounts authorized to be appropriated to the Secretary of Energy for defense nuclear nonproliferation activities shall be available for purposes of the program under this section.
The Secretary of Energy may, with the concurrence of the Secretary of State, enter into one or more agreements with any person (including a foreign government, international organization, or multinational entity) that the Secretary of Energy considers appropriate under which the person contributes funds for purposes of the programs described in paragraph (2).
The programs described in this paragraph are any programs within the Office of Defense Nuclear Nonproliferation of the National Nuclear Security Administration.
Notwithstanding section 3302 of title 31, the Secretary of Energy may retain and use amounts contributed under an agreement under paragraph (1) for purposes of the programs described in paragraph (2). Amounts so contributed shall be retained in a separate fund established in the Treasury for such purposes and shall be available for use without further appropriation and without fiscal year limitation.
If an amount contributed under an agreement under paragraph (1) is not used under this subsection within 5 years after it was contributed, the Secretary of Energy shall return that amount to the person who contributed it.