Document: NUREG-0800
Document ID: 9c59dff8-9325-43e2-8e81-843a0f6b4b2f
Document Type: srp
Title: and Regulatory Guide 1.189.
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:
minimize the potential for a fire to result in the release or spread of radioactive materials. 4.1 Fire Detection and Alarms Systems Revision 4 - October 2003 48 Detection systems in operating reactor facilities are generally placed in locations where fire hazards present an exposure threat to safety related equipment. Under decommissioning, the fire hazards and the associated detection and alarm requirements may change significantly. The change in priority from protecting safety related equipment required for safe shutdown, to protecting against the release or spread of radioactive material, may require re-evaluation of the detection and alarm system design to ensure that decommissioning fire hazards are adequately protected. 4.2 Fire Barriers For operating reactors, fire area boundaries are generally established based on the need to separate and protect safe shutdown systems. Based on a fire hazards analysis, fire areas may be re-designated to address the unique hazards and protection requirements of the decommissioning process. Fire areas should be designated based on consideration of the hazards present, the potential for a fire in a given area to result in release of radioactive materials, the ability to effectively contain, fight, and control the fire using manual suppression, and the ability of personnel to safely evacuate the plant. Fire areas should be separated by fire rated barriers. The fire resistance rating of a fire barrier should be commensurate with the potential fire severity in each fire area. 4.3 Fire Suppression Systems Fire suppression capability should be maintained during shutdown/decommissioning based on the fire hazards analysis, including water supplies and distribution systems, automatic suppression systems, and manual fire fighting systems (e.g., hydrants and standpipes). Specific considerations include: a. Maintaining adequate and reliable fire water supply and distribution to meet flow demands based on fire hazards analysis.