Document: NUREG-0800
Document ID: 02f672d7-50e8-458f-90d4-e5eb19bd5a4d
Document Type: srp
Title: EMERGENCY DIESEL ENGINE COOLING WATER SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550035.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.5
CFR Part: 
CFR Title: 

Content:
ithstand the effects of natural phenomena like as earthquakes, tornadoes, hurricanes, floods, tsunami, and seiches without loss of capability to perform safety functions. The EDECWS safety function is to provide cooling water for the emergency diesel engine (EDE) following an engine start signal. Compliance with GDC 2 requirements ensure that natural phenomena events will not affect EDECWS capability to supply cooling water to the diesel engines. 2. GDC 4 requires that SSCs important to safety be designed to withstand such dynamic effects of pipe ruptures as pipe whip and jet impingement, and externally- or internally-generated missiles. The EDECWS safety function is to provide cooling water to the EDE following an engine start signal. Compliance with GDC 4 provides assurance that the dynamic effects of equipment failures and events external to the plant will not affect EDECWS capability to provide cooling water to the EDEs. 9.5.5-7 Revision 3 - March 2007 3. GDC 5 prohibits the sharing of SSCs important to safety among nuclear power units unless such sharing can be demonstrated not to impair their ability to perform safety functions, including in an accident in one unit an orderly shutdown and cooldown of the remaining unit. The EDECWS safety function is to provide cooling water to the EDE following an engine start signal. Compliance with GDC 5 provides assurance that EDECWS failure in one unit of the site will not propagate to other units of the site. 4. GDC 17 requires, for the functioning of SSCs important to safety, an onsite electric power system with sufficient independence and redundancy for the performance of safety functions assuming a single failure. Compliance with GDC 17 requirements provide assurance that electric power will be available for systems necessary (i) to prevent fuel damage in anticipated operational occurrences and (ii) to maintain core cooling and containment integrity in postulated accidents. 6. GDC 44 requires a cooling system to