to remain available until expended: Provided , That of such amount, $44,100,000 shall be available until September 30, 2019, for program direction. Federal salaries and expenses For expenses necessary for Federal Salaries and Expenses in the National Nuclear Security Administration, $396,000,000, to remain available until September 30, 2019, including official reception and representation expenses not to exceed $12,000. ENVIRONMENTAL AND OTHER DEFENSE ACTIVITIES Defense environmental cleanup For Department of Energy expenses, including the purchase, construction, and acquisition of plant and capital equipment and other expenses necessary for atomic energy defense environmental cleanup activities in carrying out the purposes of the Department of Energy Organization Act ( 42 U.S.C. 7101 et seq.), including the acquisition or condemnation of any real property or any facility or for plant or facility acquisition, construction, or expansion, $5,579,968,000, to remain available until expended: Provided , That of such amount, $290,150,000 shall be available until September 30, 2019, for program direction: Provided further , That of such amount, $55,000,000 shall be available for the deactivation and decommissioning of high-risk excess facilities that are not in the current project inventory of the Environmental Management program. Defense Uranium Enrichment Decontamination and Decommissioning (including transfer of funds) For an additional amount for atomic energy defense environmental cleanup activities for Department of Energy contributions for uranium enrichment decontamination and decommissioning activities, $788,000,000, to be deposited into the Defense Environmental Cleanup account which shall be transferred to the Uranium Enrichment Decontamination and Decommissioning Fund . Uranium supply and enrichment activities The unappropriated receipts currently in the Uranium Supply and Enrichment Activities account shall be transferred to and merged with the Uranium Enrichment Decontamination and Decommissioning Fund