Document: NUREG-0800
Document ID: ed02b850-92b8-49b0-bb93-6c21528c5133
Document Type: srp
Title: EMERGENCY DIESEL ENGINE STARTING SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550034.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.6
CFR Part: 
CFR Title: 

Content:
and jet impingement forces of pipe breaks apply to safety-related EDESS SSCs. Comprehensive compliance with GDC 4 is reviewed under other SRP sections as specified in subsection I of this SRP section. 3. GDC 5 requirements for sharing of SSCs important to safety among nuclear power units are met if each unit has its own diesel generator(s) and each diesel generator an independent starting system. 4. GDC 17 as to the capability of the diesel engine air starting system to meet independence and redundancy criteria. Specific criteria and guidance necessary to meet GDC 17 requirements are as follow: A. NUREG/CR-0660 "Enhancement of Onsite Emergency Diesel Generator Reliability." B. Each diesel engine should have a dedicated air starting system consisting of an air compressor, an air dryer, one or more air receiver(s), piping, injection lines and valves, and devices to crank the engine as recommended by the engine manufacturer. C. As a minimum, the air starting system should be capable of cranking a cold diesel engine five times without recharging the receiver(s). The air starting system capacity should be determined as follows: (i) each cranking cycle duration should be approximately three seconds, (ii) consist of two to three engine revolutions, or (iii) air start requirements per engine start provided by the engine manufacturer, whichever air start requirement is larger. D. Alarms should alert operating personnel if the air receiver pressure falls below the minimum allowable value. E. Provisions for the periodic or automatic blowdown of accumulated moisture and foreign material in the air receiver(s) and other system critical points. F. Starting air should be dried to a dew point of not more than 10EC (50EF) when installed in a normally-controlled 21EC (70EF) environment; otherwise, the starting air dew point should be controlled to at least 5.5EC (10EF) less than the lowest expected ambient temperature. 9.5.6-6 Revision 3 - March 2007 Technical Rationale The technical