Document: NRC Regulatory Guide
Document ID: 8e45dce1-e1e7-4415-b1dd-7e2a610e545b
Document Type: regulatory_guide
Title: Fire Protection for Nuclear Power Plants (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2023/ML20231A835.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.189
CFR Part: 
CFR Title: 

Content:
materials, and soundproofing should be noncombustible. The fire hazards analysis should identify in situ combustible materials used in plant SSCs and specify suitable fire protection. Metal deck roof construction should be noncombustible and listed as “acceptable for fire” in the Underwriters Laboratories, Inc. (UL) “Building Materials Directory” (Ref. 92) or listed as Class I in the DG-1359, Page 58 Factory Mutual Research Corp., “Factory Mutual Research Approval Guide—Equipment, Materials, and Services for Conservation of Property,” issued September 2000 (Ref. 93). 4.1.1.1 Interior Finish Interior finishes should be noncombustible. The following materials are acceptable for use as interior finish without evidence of test and listing by a recognized testing laboratory: a. plaster, acoustic plaster, and gypsum plasterboard (gypsum wallboard), either plain, wallpapered, or painted with oil- or water-based paint; b. ceramic tile and ceramic panels; c. glass and glass blocks; d. brick, stone, and concrete blocks, plain or painted; e. steel and aluminum panels, plain, painted, or enameled; and f. vinyl tile, vinyl-asbestos tile, linoleum, or asphalt tile on concrete floors. Suspended ceilings and their supports should be of noncombustible construction. Concealed spaces should be devoid of combustibles except as noted in Regulatory Position 6.1.2 of this guide. In situ fire hazards should be identified and suitable protection provided. 4.1.1.2 Testing and Qualification Interior finishes should be noncombustible (see the “Glossary” of this guide) or listed by an approving laboratory for the following: a. surface flame spread rating of 25 or less and a smoke development rating of 450 or less, when tested under ASTM International (ASTM) E84, “Standard Test Method for Surface Burning Characteristics of Building Materials” (Ref. 94); b. potential heat release of 8,141 kilojoules per kilogram (kJ/kg) (3,500 Btu/pound (lb)) or less when tested under ASTM