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:
tion 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 fire areas should also be acceptable as described in Regulatory Position 2.2.4.2 of RG 1.205. When a licensee 9.5.1.2-17 Rev. 0 – December 2009 transitions to NFPA 805, the reviewer should ensure that the licensee has identified any RAs that have been previously approved by the NRC and provided sufficient basis for that approval. The additional risk of previously-approved RAs is deemed to be acceptable by virtue of the previous NRC approval,3 but that risk is included in the determination of the acceptability of non-previously-approved variances from the NFPA 805, Section 4.2.3, deterministic criteria during transition to a RI/PB FPP licensing basis. Regulatory Position 2.2.4 of RG 1.205 provides guidance that the reviewer should use to determine whether the fire-area and total plant change in risk is acceptable. The staff should review any combined changes and cumulative risk as described in Section III.5.6 below. III.5.6 Cumulative Risk and Combined Changes Section 2.4.4.1 of NFPA 805 requires licensees to evaluate the cumulative effect of plant changes (including all previous changes that have increased risk) on overall risk. The staff will review the licensee’s evaluation of cumulative risk in accordance with the guidance in Section 3.3.2 of RG 1.174. For a transition LAR, cumulative risk is the total risk of transition. After transition to NFPA 805, the cumulative risk of further plant changes will be the change in risk between any future RI/PB changes and the fire CDF and LERF associated with the plant immediately after transition to NFPA 805. If the licensee includes a license condition permitting self approval of future changes to the FPP, the staff will verify that the proposed license condition limits the risk increase from any individual change such that