Document: NUREG-0800
Document ID: 05a851a6-07ff-41b4-8528-a032ba433e04
Document Type: srp
Title: FIRE PROTECTION PROGRAM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0327/ML032740044.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.1
CFR Part: 
CFR Title: 

Content:
the basis of existing plant design and Revision 4 - October 2003 27 layout. Evaluations by some licensees made prior to 10 CFR Part 50, Appendix R, were based on fire zones that do not meet the strict definition of fire areas. In some cases, the separation of redundant safe shutdown success paths within the fire zone boundaries and the separation between fire zones do not comply with the separation requirements of Appendix R. Such configurations may be acceptable under the exemption process. Fire zone concepts should not be applied in protecting redundant systems in advanced reactor designs. The fire hazards analysis should identify the individual fire areas and zones in the plant, the design of the fire separations, and the underlying purpose of the separation (e.g., separation of redundant safe shutdown systems). Additional guidelines for fire areas/zones and the design of fire barrier separations is provided in Regulatory Guide 1.189. 7.1.2 Access and Egress Design The plant layout should include adequate means of access to all plant areas for manual fire suppression. The plant layout should also allow for safe access and egress to areas for personnel performing safe shutdown operations. Considerations should include fire and post-fire habitability in safe shutdown areas, protection or separation from fire conditions of access and egress pathways to safe shutdown structures, systems, and components, and potential restrictions or delays to safe shutdown area access potentially caused by (security) locking systems. 7.1.3 Combustibility of Building Components and Features Materials used in construction or fabrication of nuclear power plant structures, systems, and components should be noncombustible or heat resistant to the extent practical in accordance with requirements in GDC 3. Walls, floors, roofs, including structural materials, suspended ceilings, thermal insulation, radiation shielding materials, and soundproofing and interior finishes should be