Document: NRC Regulatory Guide
Document ID: b143ccef-ed08-482d-bc4b-b4e012328090
Document Type: regulatory_guide
Title: Applications for Nuclear Power Plants (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1523/ML15233A056.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.206
CFR Part: 
CFR Title: 

Content:
inimize the amount of information in Tier 1 to allow additional flexibility for a COL applicant or licensee who references a DCR. Tier 2 also specified many codes, standards, and design processes that Tier 1 does not specify but that the staff found acceptable for meeting ITAAC. As a result, Tier 2 contains certain significant information that is not changed without prior NRC approval. This information is designated Tier 2* and is generally marked with italics or brackets and an asterisk in the generic DCD. A portion of this information retains its Tier 2* designation throughout the duration of a COL license, including any license renewal, because of the need for NRC review of any changes. The remainder is associated primarily with construction detail and, therefore, reverts to the standard process for Tier 2 information after the Commission makes its finding in accordance with 10 CFR 52.103(g) that the acceptance criteria in the COL are met. Examples of these two groups of information for the AP1000 DCR can be found in Section VIII.B.6.b (e.g., fuel information) and Section VIII.B.6.c (e.g., structural dimensions of the nuclear island) of Appendix D, “Design Certification Rule for the AP1000 Design,” to 10 CFR Part 52. A COL applicant proposing to depart from Tier 2* information in the generic DCD should describe the basis for the change (grouped by topic as appropriate), justify the regulatory acceptability, and provide appropriate revisions to the plant-specific DCD. Requests for departures from Tier 2* information that affect Tier 1 should also follow the Tier 1 change procedures described above. Information that departs from Tier 2* of the generic DCD, if approved by the NRC staff using the license amendment process, becomes part of Tier 2* in the plant-specific DCD (as defined in Section II of the DCR) that is maintained by the applicant or licensee. For this reason, this information remains subject to the Tier 2* change process. Changes to Operational