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:
ms descriptions in the SAR that identify mechanical and performance characteristics are reviewed to verify that the above seismic and quality classifications have been included and that the piping and instrumentation diagrams (P&IDs) indicate any points of change at systems or systems components interfaces. B. Failure of a piping interconnection between subsystems as shown on the system P&IDs will not cause total degradation of the lube oil system function. The results of failure modes and effects analyses are used in this verification. 9.5.7-8 Revision 3 - March 2007 C. The system layout drawings are examined for sufficient space to permit inspection of components. D. The design contains an independent circulation loop to maintain crankcase oil temperature above a minimum value during the standby mode. E. The system P&IDs indicate the temperature, pressure, and level sensors which alert the operator when these parameters exceed the ranges recommended by the engine manufacturer. F. The system is designed to minimize the potential fire hazard from leaking lube oil accumulating on the engine exhaust manifold and in the turbocharger housing from excessively long prelubrication of the engine prior to starting. The prelube time interval prior to manual starting of the engine should be limited to three to five minutes unless otherwise recommended by the diesel engine manufacturer. G. The system is designed to preclude dry starting of the diesel engine during emergency starts, that is, the momentary lack of lubrication at various moving parts or bearing surfaces caused by the tendency for lube oil to drain during long standby periods. It is necessary for the system to establish as quickly as possible an oil film on the wearing parts of the diesel engine; causing damage to a bearing 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