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:
ization requirements in the proposed 10 CFR 50.69 (68 FR 26511), subject to the following clarifications, enhancements, and conditions. [To be determined upon resolution of the issues discussed in the attachment, either by appropriate revisions to NEI 00-04 or by inclusion of staff positions in the Regulatory Guide] 2. Use of Methods Other Than Draft Revision C of NEI 00-04 To meet the requirements of the proposed 10 CFR 50.69 for categorization of SSCs, licensees may use methods other than those set forth in Draft Revision C of NEI 00-04. The NRC will determine the acceptability of these other methods on a case-by-case basis. 3. Other Documents Referenced in Draft Revision C of NEI 00-04 Draft Revision C of NEI 00-04 references numerous other documents, but NRC’s endorsement of Draft Revision C of NEI 00-04 is not an endorsement of these other referenced documents. 4. Use of Examples in Draft Revision C of NEI 00-04 Draft Revision C of NEI 00-04 includes examples to supplement the guidance. While appropriate for illustrating and reinforcing the guidance in Draft Revision C of NEI 00-04, the NRC’s endorsement of Draft Revision C of NEI 00-04 is not a determination that the examples are applicable for all licensees. A licensee must ensure that an example is applicable to its particular circumstances before implementing the guidance as described in the example. 5. Limitations of Types of Analyses Used in Implementing Draft Revision C of NEI 00-04 In its 1995 Policy Statement on the use of probabilistic risk assessment (PRA), the Commission determined that the use of PRA technology should be increased in all regulatory matters to the extent supported by state-of-the-art PRA methods and data. Implementation of risk-informed regulation is possible because the development and use of a quantitative PRA requires a systematic and integrated evaluation. Development of a technically defensible quantitative PRA also requires sufficient and structured documentation to allow