Document: NUREG-0800
Document ID: 6f03df27-1f8c-428c-8e39-9465d1235fa1
Document Type: srp
Title: EMERGENCY DIESEL ENGINE LUBRICATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0704/ML070460354.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.7
CFR Part: 
CFR Title: 

Content:
earing surface resulting in engine unavailability. To remedy this situation, any one of the following may be used and should be confirmed with the diesel engine manufacturer: i. An electrically-driven lubricating oil pump powered from a reliable direct current power supply and installed to operate in parallel with the engine-driven main lube oil pump. The electric-driven prelube pump should operate only during the engine cranking cycle or until satisfactory lube oil pressure is established in the engine main lube oil distribution header. ii. Installation of a continuously-operated prelube system to provide lube oil to all moving parts and bearing surfaces during standby. Appropriate alarms should alert operators to pump failure or low system pressure. iii. Installation of an intermittently-operated prelube system to provide lube oil to all moving parts and bearing surfaces during standby. This system would operate automatically for a minimum time per day as specified by the diesel engine manufacture to prelube the moving parts. Appropriate alarms should alert operators of pump failure to start. H. The design provides for the total heat removal rates required by the system and the margin in the design heat removal rate capability. I. The system inventory, including the engine sump and onsite storage capacity, is designed with sufficient volume to support continuous, full-load diesel engine operation for seven days. 9.5.7-9 Revision 3 - March 2007 4. The reviewer determines whether the system is designed to maintain its function under adverse environmental phenomena. The reviewer, using engineering judgment and the results of failures modes and effects analyses, determines whether: A. The failure of either systems not designed to seismic Category I requirements or nonseismic Category I structures that house, support, or are close to the EDELS, will not preclude functioning of the system. Chapters 2 and 3 of the SAR describe related site features and provide the