Document: NUREG-0800
Document ID: 757f66f9-1dd5-4125-9970-089087134ad9
Document Type: srp
Title: FIRE PROTECTION PROGRAM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0905/ML090510170.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.1.1
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thout guidance as to the relative risk significance of one aspect of the program over another. While the current fire protection regulations and guidance are risk-informed to a certain extent, they do not provide a basis for focusing staff resources on the most risk-significant areas of fire protection. The experience gained from regulating and inspecting existing plants has identified aspects of the plant FPPs that warrant more extensive review. In addition, while a risk-informed approach to new reactor design review should reflect the experience gained in connection with existing plants, the new reactors include significant design improvements that impact the FPP. 9.5.1.1-18 Revision 0 – February 2009 These design improvements should also be considered when reviewing a license application for a new reactor plant. Finally, in addition to the Browns Ferry fire, there have been other notable plant fires that have provided insight with respect to specific nuclear plant fire risks and how to protect against them (see e.g., IN 2002-27, ARecent Fires at Commercial Nuclear Power Plants in the United States@). The following discussion of the relative risk significance of the various aspects of a plant FPP applies to all new reactors, whether or not they adopt a risk-informed, performance-based FPP. 6.1 Primary Focus of Staff Review Since the new reactor approach to protection of post-fire safe-shutdown capability is to provide installed passive separation of redundant trains, the staff review should focus on the licensee=s approach to train separation. The staff should review the detailed definition of train separation; the method of identifying which systems, components and circuits need to be separated; the assumptions upon which adequate separation is determined; the design and testing of the separation barriers; the approach when full separation is not feasible; the method of verifying that the separation barrier is installed and maintained properly; and the method