; Public Law 115–439 ) (as redesignated by section 201(a)(1)) is amended— (1) by striking The term and inserting the following: (A) In general The term ; and (2) by adding at the end the following: (B) Exclusions The term corporate support costs does not include— (i) costs for rent and utilities relating to any and all space in the Three White Flint North building that is not occupied by the Commission; or (ii) costs for salaries, travel, and other support for the Office of the Commission. . 504. Performance metrics and milestones Section 102(c) of the Nuclear Energy Innovation and Modernization Act ( 42 U.S.C. 2215(c) ) is amended— (1) in paragraph (3)— (A) in the paragraph heading, by striking 180 and inserting 90 ; and (B) by striking 180 and inserting 90 ; and (2) by adding at the end the following: (4) Periodic updates to metrics and schedules (A) Review and assessment Not less frequently than once every 3 years, the Commission shall review and assess, based on the licensing and regulatory activities of the Commission, the performance metrics and milestone schedules established under paragraph (1). (B) Revisions After each review and assessment under subparagraph (A), the Commission shall revise and improve, as appropriate, the performance metrics and milestone schedules described in that subparagraph to provide the most efficient metrics and schedules reasonably achievable. . 505. Nuclear licensing efficiency (a) Office of nuclear reactor regulation Section 203 of the Energy Reorganization Act of 1974 ( 42 U.S.C. 5843 ) is amended— (1) in subsection (a), by striking (a) There and inserting the following: (a) Establishment; appointment of director There ; (2) in subsection (b)— (A) in the matter preceding paragraph (1)— (i) by striking (b) Subject and inserting the following: (b) Functions of director Subject ; and (ii) by striking delegate including: and inserting delegate, including the following: