; 132 Stat. 1722)) site; and (II) pre-application activities relating to an early site permit (as defined in section 52.1 of title 10, Code of Federal Regulations (or any successor regulation)) to demonstrate an advanced nuclear reactor on a Department of Energy site or critical national security infrastructure (as defined in section 327(d) of the John S. McCain National Defense Authorization Act for Fiscal Year 2019 ( Public Law 115–232 ; 132 Stat. 1722)) site. . (b) Effective date The amendment made by subsection (a) shall take effect on October 1, 2025. 205. Fusion energy regulation (a) Definition Section 11 of the Atomic Energy Act of 1954 ( 42 U.S.C. 2014 ) is amended— (1) in subsection e.— (A) in paragraph (3)(B)— (i) in clause (i), by inserting , including by use of a fusion machine after particle accelerator ; and (ii) in clause (ii), by inserting if made radioactive by use of a particle accelerator that is not a fusion machine, before is produced ; (2) in each of subsections ee. through hh., by inserting a subsection heading, the text of which comprises the term defined in the subsection; (3) by redesignating subsections ee., ff., gg., hh., and jj. as subsections jj., gg., hh., ii., and ff., respectively, and moving the subsections so as to appear in alphabetical order; (4) in subsection dd., by striking dd. The and inserting the following: ee. High-level radioactive waste; spent nuclear fuel The ; and (5) by inserting after subsection cc. the following: dd. Fusion machine The term fusion machine means a machine that is capable of— (1) transforming atomic nuclei, through fusion processes, into different elements, isotopes, or other particles; and (2) directly capturing and using the resultant products, including particles, heat, or other electromagnetic radiation. . (b) Technical and conforming changes (1) In general Section 103(a) of the Nuclear Energy Innovation and Modernization Act ( 42 U.S.C. 2133 note