The U.S. Nuclear Regulatory Commission (NRC or the Commission) is amending its regulations related to verification of nuclear power plant construction activities through inspections, tests, analyses, and acceptance criteria (ITAAC) under a combined license, and issuing a revision to Regulatory Guide (RG) 1.215, "Guidance for ITAAC Closure Under 10 CFR [Title 10 of the Code of Federal Regulations] Part 52." The final rule contains new provisions that apply after a licensee has completed an ITAAC and submitted an ITAAC closure notification. The new provisions require licensees to report new information materially altering the basis for determining that inspections, tests, or analyses were performed as required, or that acceptance criteria are met, and to notify the NRC of the completion of all ITAAC activities. In addition, the NRC is including editorial corrections to existing language in the NRC's regulations to make that language consistent with language in the Atomic Energy Act of 1954, as amended (AEA). Regulatory Guide 1.215 describes a method that the staff of the NRC considers acceptable for use in satisfying the requirements for documenting the completion of ITAAC.