Document: NRC Regulatory Guide
Document ID: 80776ca5-a83d-4667-9a94-0bffa1befa91
Document Type: regulatory_guide
Title: Fire Protection Guidelines for Nuclear Power Plants (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1221/ML12216A013.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.120
CFR Part: 
CFR Title: 

Content:
ystems from each other so that both are not subject to damage from a single fire hazard; and (c) Separate individual units on a multiple-unit site unless the requirements of General Design Criterion 5 can be met with respect to fires. (2) Appropriate fire barriers should be provided within a single safety division to separate components that present a fire hazard to other safety-related components or high concen- trations of safety-related cables within that division. (3) Each cable spreading room should contain only one redundant safety division. Cable spreading rooms should not be shared between reactors. Cable spreading rooms should be separated from each other and from other areas of the plant by barriers having a minimum fire resistance of three hours. d (4) Interior wall and structural components, thermal insulation materials, radiation shielding materials, and soundproofing should be noncombustible. Interior finishei should be noncombustible or listed by a nationally recognized testing laboratory such as Factory Mutual or Underwriters Laboratory, Inc., for: (a) Surface flamespread rating of 50 or less when tested under ASTM E-84, and (b) Potential heat release of 3500 Btu/Ib or less when tested under ASTM D-3286 or NFPA 259.1 Materials that are acceptable for use as interior finish without evidence of test and listing by a nationally recognized laboratory are the following: Plaster, acoustic plaster Gypsum plasterboard (gypsum wallboard) Any of the above, plain, wallpapered, or painted with oil- or water-base paint Ceramic tile, ceramic panels Glass, glass blocks Brick, stone, concrete blocks, plain or painted Steel and aluminum panels, plain, painted, or enameled Vinyl tile, vinyl-asbestos tile, linoleum, or asphalt tile on concrete floors. (5) Metal deck roof construction should be noncombustible, listed as "acceptable for fire" in the UL Building Materials Directory, or listed as Class I in the Factory Mutual System Approval Guide. (6) Suspended ceilings