Document: NUREG-0800
Document ID: 90f64116-09ca-459d-8277-ecf8fc888100
Document Type: srp
Title: EMERGENCY DIESEL ENGINE LUBRICATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070572.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.7
CFR Part: 
CFR Title: 

Content:
esel engine during emergency starts, that is, the momentary lack of lubrication at the various moving parts or bearing surfaces resulting from the tendency for the lube oil system to drain during long periods of standby. It is necessary for the system to establish as quickly as possible an oil film on the wearing parts of the diesel engine; otherwise, damage to the bearing surface will result causing unavailability of the engine. To remedy this situation, any one of the following may be used and should be confirmed with the diesel engine manufacturer: (1) An electrically driven lubricating oil pump powered from a reliable DC 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. (2) Installation of a continuously operated prelube system which would provide lube oil to all moving parts and bearing surfaces during the standby condition of operation. Appropriate alarms should be provided to alert operators to pump failure or low system pressure. 9.5.7-9 DRAFT Rev. 3 - April 1996 (3) Installation of an intermittently operated prelube system which would provide lube oil to all moving parts and bearing surfaces during the standby condition of operation. This system would operate automatically for a minimum of 5 minutes per day to prelube the moving parts. Appropriate alarms should be provided to alert operators of pump failure to start. i. The design provides for the total heat removal rates required by the system and the margin in the design heat removal rate capability. j. The system inventory, including the engine sump and onsite storage capacity, is designed with sufficient volume to support continuous full-load operation of the diesel engine for a period of 7 days.49 2. The reviewer determines that the system is designed to maintain its