Document: NUREG-0800
Document ID: 7bdf9a80-e0a1-48fe-a048-0d2501e0ff68
Document Type: srp
Title: EMERGENCY DIESEL ENGINE COMBUSTION AIR INTAKE AND EXHAUST
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070573.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.8
CFR Part: 
CFR Title: 

Content:
ctures, systems and components important to safety. The safety function of the EDECAIES is to supply quality combustion air to the emergency diesel engine. A quality combustion air supply is necessary to ensure the capability of the emergency diesel engine to provide 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. The EDECAIES is an integral part of the emergency diesel generator system. Therefore, compliance with the requirements of GDC 2 provides 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 EDECAIES is to provide combustion air to the emergency diesel engines under all operating conditions, such as following a loss of offsite power. In order to ensure the availability of emergency ac power, the EDECAIES must be capable of supplying combustion air 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 affect the capability of the EDECAIES to provide combustion air to the emergency diesel engines. DRAFT Rev. 3 - April 1996 9.5.8-6 3. GDC 5 prohibits the sharing of SSC important to safety among nuclear power units unless it can be demonstrated that such sharing will not