Document: NRC Regulatory Guide
Document ID: 2459a562-8984-421c-8058-d096dbb9617c
Document Type: regulatory_guide
Title: Guidelines for Categorizing Structures, Systems, and Components in Nuclear Power Plants According to Their Safety Significance
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0314/ML031430373.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.201
CFR Part: 
CFR Title: 

Content:
al increase in core damage frequency (CDF) and large early release frequency (LERF), uncertainties should be addressed as discussed in Section 2.2.5 of Regulatory Guide 1.174. The NRC staff also notes that there are potentially large differences in the levels of uncertainty in the modeling and data for the PRA models for the various types of events. This limits the ability of the licensee to perform the integral assessment proposed in Section 5.5 of Draft Revision C of NEI 00-04. It is for this reason that the NRC staff believes that it is appropriate to use the most conservative categorization over all the contributors taken individually. 6 D. IMPLEMENTATION The purpose of this section is to provide information to applicants and licensees regarding the NRC staff’s plans for using this regulatory guide. This draft guide has been released to encourage public participation in its development. Except when an applicant or licensee proposes an acceptable alternative method for complying with the specified portions of the NRC’s regulations, the methods to be described in the active guide reflecting public comments will be used in the evaluation of licensee compliance with the requirements of 10 CFR 50.69 for the categorization of SSCs. 7 Value/Impact Statement A separate Value/Impact Statement was not prepared for this draft regulatory guide. The Value/Impact Statement that was prepared as part of the Regulatory Analysis (ADAMS Accession No. ML022630028) for the rulemaking is still applicable. ATTACHMENT TO DRAFT REGULATORY GUIDE DG-1121 The following issues need to be resolved in order for the NRC staff to prepare positions on the acceptability of specific provisions in NEI 00-04, “Draft Revision C of Nuclear Energy Institute (NEI) 00-04,”10 CFR 50.69 SSC Categorization Guideline.” (ADAMS Accession No. ML021910534). Section numbers refer to those of Draft Revision C of NEI 00-04, dated June 2002. A. Quality Attributes. As discussed in Regulatory Position 6 of