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:
supply. For the latter, provisions should be made to ensure a continuous supply of fire protection water whenever the cooling tower basin is drained for cleaning or other maintenance. 7. Protection of Special Fire Hazards Exposing Areas Important to Safety 7.1 Reactor Coolant Pump Oil Collection External RCPs with oil lubrication systems should be equipped with an oil collection system if the containment is not inerted during normal operation. The oil collection system should be designed, engineered, and installed to ensure that failure will not lead to fire during normal or design-basis accident conditions and that the system will withstand the safe-shutdown earthquake. Such collection systems should be capable of collecting lube oil from all potential pressurized and unpressurized leakage sites in the RCP lube oil systems. Leakage should be collected and drained to a vented closed container that can hold the entire lube oil system inventory. A flame arrester is required in the vent if the flashpoint characteristics of the oil present the hazard of fire flashback, as described in the plant-specific licensing basis (i.e., 10 CFR Part 50, Appendix R, Section III.O, or applicable BTP). DG-1359, Page 99 Leakage points to be protected should include, but are not limited to, lift pump and piping, overflow lines, lube oil cooler, oil fill and drain lines and plugs, flanged connections on oil lines, and lube oil reservoirs when such features exist on the RCPs. The drain line should be large enough to accommodate the largest potential oil leak. As described in the plant-specific licensing basis (i.e., 10 CFR Part 50, Appendix R, Section III.O, or applicable BTP), one or more tanks need to be provided with sufficient capacity to collect the total lube oil inventory from all RCPs draining to the container. Alternatives that may be acceptable include the following: a. One or more tanks are provided with sufficient capacity to hold the total lube oil inventory of one RCP with