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:
important to safety be designed to withstand the effects of natural phenomena such as earthquakes, tornadoes, hurricanes, floods, tsunami, and seiches without loss of capability to perform the safety function. Regulatory Guide 1.117 provides the methods acceptable to the staff for tornado design classification of structures, systems and components important to safety. The safety function of the EDELS is to provide essential lubrication to the emergency diesel engine. Proper lubrication of the emergency diesel engine is necessary to ensure engine availability for prompt restoration of ac power to safety related components that are necessary to maintain the integrity of the reactor coolant pressure boundary, to safely shutdown the reactor and maintain it in a safe shutdown condition, and to prevent or mitigate the consequences of accidents. Compliance with the requirements of GDC 2 provides DRAFT Rev. 3 - April 1996 9.5.7-6 assurance that emergency ac power will be available to safety-related components in the event of a loss of offsite power resulting from natural phenomena events. 2. GDC 4 requires that SSC important to safety be designed to withstand the dynamic effects of pipe ruptures such as pipe whip and jet impingement, and externally or internally generated missiles. The safety function of the EDELS is to provide essential lubrication to the emergency diesel engines under standby and operating conditions, such as following a loss of offsite power. In order to ensure the availability of emergency ac power, the EDELS must be capable of performing the engine lubrication function under the expected operational and postulated accident conditions for the plant. These conditions include consideration of the dynamic effects of equipment failures such as pipe ruptures and turbine missiles, and events and conditions external to the plant. Compliance with GDC 4 provides assurance that the dynamic effects of equipment failures, and events external to the plant, will not