Document: NRC Regulatory Guide
Document ID: 5810150e-ee20-4cd1-b72f-6e918a603f73
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:
ction VIII.B.5 Tier 2 Departure (prior NRC approval not required) DCR Section VIII.B.5 (Note that the departure does not involve a change to or departure from Tier 1, Tier 2*, or the generic technical specifications or otherwise require prior NRC approval.) The COL applicant should identify, evaluate, and justify each exemption request and proposed departure. The applicant should include such explanatory documentation in Part 7 of the COLA (see Section C.1.7). Changes to Tier 1 Information As defined in Section II, “Definitions,” of the DCRs, Tier 1 is the portion of the generic DCD that is approved and certified by the DCR. It includes definitions and general provisions, design descriptions, ITAAC, significant site parameters, and significant interface requirements. It is derived from the more detailed information in Tier 2 (described below). Because the information in Tier 1 represents the certified portion of the design, strict requirements for changes to this information are in place. A COL applicant requesting an exemption should describe the basis for the change (grouped by topic where appropriate) and justify the regulatory acceptability, as well as provide the appropriate revisions to the generic DCD in the plant-specific DCD. When the exemption involves an underlying substantive requirement (e.g., a regulation in 10 CFR Part 50), the COL applicant should also show, as appropriate under 10 CFR 52.7, that the exemption from the underlying applicable requirement meets the criteria in 10 CFR 50.12. Information that departs from Tier 1 of the generic DCD, if approved by the NRC staff using the exemption process, becomes part of Tier 1 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 1 change process. DG-1325, Page-96 Changes to Tier 2 Information As defined in Section II of the DCRs, Tier 2 is the portion of the generic DCD that is