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 and shall be available only to the extent provided in advance in appropriations Acts. Other defense activities For Department of Energy expenses, including the purchase, construction, and acquisition of plant and capital equipment and other expenses, necessary for atomic energy defense, other defense activities, and classified 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, $784,000,000, to remain available until expended: Provided , That of such amount, $257,116,000 shall be available until September 30, 2019, for program direction. Power marketing administrations Bonneville power administration fund Expenditures from the Bonneville Power Administration Fund, established pursuant to Public Law 93–454 , are approved for official reception and representation expenses in an amount not to exceed $5,000: Provided , That during fiscal year 2018, no new direct loan obligations may be made. Operation and maintenance, southeastern power administration For expenses necessary for operation and maintenance of power transmission facilities and for marketing electric power and energy, including transmission wheeling and ancillary services, pursuant to section 5 of the Flood Control Act of 1944 ( 16 U.S.C. 825s ), as applied to the southeastern power area, $6,379,000, including official reception and representation expenses in an amount not to exceed $1,500, to remain available until expended: Provided , That notwithstanding 31 U.S.C. 3302 and section 5 of the Flood Control Act of 1944, up to $6,379,000 collected by the Southeastern Power Administration from the sale of power