; and (B) provide to the congressional defense committees a briefing on the results of that assessment. (4) Termination The requirements of this subsection shall terminate on the date that is one year after the date on which the project referred to in subsection (a) is completed. . 3124. Prohibition on availability of funds for naval nuclear fuel systems based on low-enriched uranium None of the funds authorized to be appropriated by this Act or otherwise made available for the National Nuclear Security Administration may be obligated or expended to conduct research or development relating to an advanced naval nuclear fuel system based on low-enriched uranium. 3125. Prohibition on availability of funds to reconvert or retire W76–2 warheads (a) Prohibition Except as provided in subsection (b), none of the funds authorized to be appropriated by this Act or otherwise made available for fiscal year 2024 for the National Nuclear Security Administration may be obligated or expended to reconvert or retire a W76–2 warhead. (b) Waiver The Administrator for Nuclear Security may waive the prohibition under subsection (a) if the Administrator, in consultation with the Secretary of Defense and the Chairman of the Joint Chiefs of Staff, certifies in writing to the congressional defense committees that— (1) Russia and China do not possess naval capabilities similar to the W76–2 warhead in the active stockpiles of the respective countries