Document: NRC Regulatory Guide
Document ID: 22ccfd5e-c5d8-4615-a02c-32369aa9f533
Document Type: regulatory_guide
Title: Acceptability of Probabilistic Risk Assessment Results for Risk-Informed Activities (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1930/ML19308B636.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.200
CFR Part: 
CFR Title: 

Content:
eria analysis • Accident sequence analysis • Systems analysis • Parameter estimation analysis • Human reliability analysis • Quantification Level 2 • Plant damage state analysis • Severe accident progression analysis • Quantification • Source term analysis Interpretation of results and documentation are technical elements of Level 1 and Level 2 base PRAs. These technical elements are applicable to the base PRA models constructed to address each of the risk contributors (hazard groups) to risk for each of the POSs. Because additional analyses are required to characterize their impact on the plant in terms of causing initiating events and mitigating equipment failures, internal floods, internal fire, seismic, high wind and external flood are discussed separately in regulatory positions C.1.2.3, C.1.2.4, C.1.2.5, C.1.2.7, and C.1.2.8, respectively. As it may be possible to screen some hazards, regulatory position C.1.2.6 on screening and conservative analyses and regulatory position C.1.2.9 provides a discussion of the technical elements associated with PRA for other hazards. While the technical elements are the same for each POS, within a specific technical element, other considerations may need to be addressed for LPSD conditions, which are discussed in regulatory position C.1.2.10 of this RG. In order to better understand the results, it is important to examine the different contributors on both an individual and relative basis. Therefore, the technical element on the interpretation of results is discussed separately in regulatory position C.1.2.11. The technical element on documentation of the PRA is discussed in regulatory position C.1.2.12. Technical Elements for Level 1, Internal Events, At-Power PRA This section identifies the technical elements for a Level 1, internal events, at-power PRA. The objective for each technical element is briefly described and the characteristics and attributes needed to achieve the objective are provided in Table