Document: NUREG-0800
Document ID: b10297dd-9822-4243-8665-c41d92699ea5
Document Type: srp
Title: RISK-INFORMED, PERFORMANCE-BASED FIRE PROTECTION PROGRAM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0925/ML092590527.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.1.2
CFR Part: 
CFR Title: 

Content:
irements in Section 4.2.3 of NFPA 805. NFPA 805, Section 4.2.4 requires that the additional risk presented by the use of these RAs be evaluated.” The staff will review the licensee’s evaluation of this additional risk of RAs. This risk evaluation may be qualitative per NFPA 805, Section 4.2.4.1 or quantitative per Section 4.2.4.2, and a bounding approach is acceptable. [RG 1.205, Regulatory Position 2.4] III.5.5 Fire Risk Evaluations NFPA 805, Section 4.2.4.2 states in part: “Use of fire risk evaluation for the PB approach shall consist of an integrated assessment of the acceptability of risk, DID, and safety margins.” The fire risk evaluation is performed on each fire area where the licensee has chosen this approach. The licensee should describe the change in risk for a given fire area in sufficient detail for the staff to be able to determine that the method is acceptable (a reference to a previously approved methodology would be sufficient if the licensee fully adopts such a methodology). The characterization of each change, or type of change, should include establishing a cause-effect relationship to identify portions of the PRA affected by the issue being evaluated. The results of the change in risk analyses should reflect this cause-effect relationship in a quantification of the impact on the PRA elements. If the impacts of a change to the plant cannot be associated with elements of the PRA, the PRA should be modified accordingly or the impact of the change should be evaluated qualitatively as part of the integrated decision-making process. In any case, the effects of the changes on the reliability and unavailability of SSCs or on operator actions should be appropriately accounted for in the risk assessment. For each fire area where the fire risk evaluation has been used to demonstrate compliance with NFPA 805, any increase in risk should be acceptable as described in Regulatory Position 2.2.4.1 of RG 1.205, and the total increase in risk from these