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:
l of detail originally envisioned in SECY-90-377 and its associated SRM. Instead, the NRC staff defined DAC as a set of prescribed limits, parameters, procedures, and attributes that it relies on in a limited number of technical areas to make a final safety determination to support a DC. For these technical areas, the DC application could include DAC and associated methodologies, design processes, and acceptance criteria. Objective and measurable DAC would enable the NRC staff to make a final safety determination, subject only to satisfactory design implementation and verification by the COL applicant through appropriate ITAAC. The NRC implemented the policy of approving DAC in a limited number of design areas. Some certified designs to date have used DAC in the areas of radiation protection, piping, instrumentation and controls, and human factors engineering.. Recent designs have not used DAC for radiation protection. The NRC has allowed the use of DAC if applicants justified one of the following two conditions: a. Providing detailed design information was not desirable because associated technologies could change so rapidly that the design could be rendered obsolete before it was built (cited for I&C and HFE). b. Completing the final design was impractical because of the unavailability of sufficient as-built or as-procured information (cited for radiation protection (shielding) and piping). GUIDANCE Design Certification Applications The DC applicant should initiate early engagement with the NRC staff concerning any design areas for which the use of DAC is being considered in the application. It is crucial that both the applicant and the NRC staff understand the proposed approach and the justification. The extent to which the DC applicant’s justification will be accepted by the NRC staff, as well as the level of detail that will be needed in the application, depends on design-specific technical considerations. If a DC applicant identifies portions of the design