; and (ii) include additional discussion, analyses, findings, and conclusions on matters resolved in the early site permit proceeding only to the extent necessary to address information that is new and significant in that the information would materially change the prior findings or conclusions. (3) Production or utilization facility located at an existing site In reviewing an application for an early site permit, construction permit, operating license, or combined construction permit and operating license for a production or utilization facility located at the site of a licensed production or utilization facility, the Commission shall, to the extent practicable, use information that was part of the licensing basis of the licensed production or utilization facility. (4) Regulations The Commission shall initiate a rulemaking, not later than 1 year after the date of enactment of this subsection, to amend the regulations of the Commission to implement this subsection. (5) Environmental impact statement defined In this subsection, the term environmental impact statement means a detailed statement required under section 102(2)(C) of the National Environmental Policy Act of 1969 ( 42 U.S.C. 4332(2)(C) ). (6) Relationship to other law Nothing in this subsection exempts the Commission from any requirement for full compliance with section 102(2)(C) of the National Environmental Policy Act of 1969 ( 42 U.S.C. 4332(2)(C) ). . 3. Updating hearing procedures (a) Informal hearing procedures Section 189 a. of the Atomic Energy Act of 1954 ( 42 U.S.C. 2239(a) ) is amended by adding at the end the following: (3) The Commission may use informal adjudicatory procedures for any hearing required under this section for which the Commission determines that adjudicatory procedures under section 554 of title 5, United States Code, are unnecessary. . (b) Study on the impact of the elimination of mandatory hearing for uncontested licensing applications Not later than 18 months after the date of enactment of this Act, the Comptroller