; and (B) the capacity for upgrades to accommodate new or expanded research needs. (2) Considerations In carrying out paragraph (1), the Secretary shall consider— (A) capabilities that support experimental high-temperature testing; (B) providing a source of fast neutrons— (i) at a neutron flux higher than that at which existing research facilities operate; and (ii) sufficient to enable research for an optimal base of prospective users; (C) maximizing irradiation flexibility and irradiation volume to accommodate as many concurrent users as practicable; (D) capabilities for irradiation with neutrons of a lower energy spectrum; (E) multiple loops for fuels and materials testing of different coolants; (F) additional pre- and post-irradiation examination capabilities; and (G) lifetime operating costs and lifecycle costs. (e) Deadline for commencement of operations To the maximum extent practicable, the Secretary shall ensure that full operations at the user facility under subsection (b) commence before December 31, 2025. (f) Funding Of the funds appropriated to the Office of Nuclear Energy of the Department, the Secretary shall use such sums as are necessary to carry out this section. . (b) Table of contents The table of contents of the Energy Policy Act of 2005 ( Public Law 109–58 ; 119 Stat. 594) (as amended by section 5(b)) is amended by inserting after the item relating to section 958A the following: Sec. 959. Versatile, reactor-based fast neutron source. . 7. Advanced nuclear fuel security program (a) Findings Congress finds that— (1) the national security nuclear enterprise, which supports the nuclear weapons stockpile stewardship and naval reactors functions of the National Nuclear Security Administration, requires a domestic fuel cycle, including uranium mining, uranium processing, uranium enrichment, and fuel fabrication, capable of producing low- and high-enriched uranium