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:
those that may necessitate evacuation from areas that are required to be attended for safe shutdown; (d) Fire in control rooms or other locations having critical safety-related functions; (e) Lack of adequate access or smoke removal facilities that impede fire extin- guishment in safety-related areas; (f) Lack of explosion-prevention measures; (g) Loss of electric power or control circuits; and (h) Inadvertent operation of fire suppression systems. (5) The fire hazard analysis should verify that the fire protection program guidelines of the regulatory position of this guide have been met. To that end, the report on the analysis should list applicable elements of the program, with explanatory statements as needed to identify location, type of system, and design criteria. The report should identify any deviations from the regulatory position and should present alternatives for staff review. Justification for deviations from the regulatory position should show that an equivalent level of protection will be achieved. Deletion of a protective feature without compensating alternative protective meas- ures generally will not be acceptable, unless it is clearly demonstrated that the protective measure is not needed because of the design and arrangement of the particular plant. c. Fire Suppression System Design Basis (1) Total reliance should not be placed on a single fire suppression system. Appro- priate backup fire suppression capability should be provided. (2) A single active failure or a crack in a moderate-energy line (pipe) in the fire suppression system should not impair both the primary and backup fire suppression capability. For example, neither the failure of a fire pump, its power supply, or controls nor a crack in a moderate-energy line in the fire suppression system should result in loss of function of both sprinkler and hose standpipe systems in an area protected by such primary and backup systems. (3) As a minimum, the fire suppression system should be