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:
performance characteristics are reviewed to verify that the above seismic and quality classifications have been included and that the P&IDs indicate any points of change at the systems and/or systems components interfaces. DRAFT Rev. 3 - April 1996 9.5.7-8 b. Failure of a piping interconnection, as shown on the system piping and instrumentation diagrams (P&IDs) between subsystems will not cause total degradation of the lube oil system function. The results of failure modes and effects analyses will be used in this determination. c. The system layout drawings are examined to ascertain that sufficient space has been provided to permit inspection of components. d. The system has been designed to preclude the entry of deleterious material into the system due to operator error or extreme natural phenomena during recharging or normal operation. The system is acceptable if it is shown in the SAR that the system is locked closed, or if entry is administratively controlled. e. The design contains an independent circulation loop to maintain the temperature of the crankcase oil above a minimum value during the standby mode. f. 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. g. The system has been designed to minimize the potential fire hazard from lube oil leaking and accumulating on the engine exhaust manifold and in the turbocharger housing as a result of excessively long prelubrication of the engine prior to starting. The prelube time interval prior to manual starting of the engine should be limited to 3 to 5 minutes unless otherwise recommended by the diesel engine manufacturer. h. The system has been designed to preclude dry starting of the diesel 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