Document: NUREG-0800
Document ID: b4cff877-ab63-46c3-8140-32e309d767a2
Document Type: srp
Title: EMERGENCY DIESEL ENGINE STARTING SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070571.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.6
CFR Part: 
CFR Title: 

Content:
system itself to withstand the effects of natural phenomena such as earthquakes, tornadoes, hurricanes, and floods, and GDC 4, "Environmental and MissileDynamic Effects Design Bases," with respect to structures housing 51 the system and the system itself being capable of withstanding the effects of externally and internally generated missiles, pipe whip, and jet impingement forces associated with pipe breaks. The EDESS is housed in a seismic Category I structure which provides protection from the effects of tornado, tornado missiles, turbine missiles, and floods. This meets the positions of Regulatory Guides 1.115, "Protection Against Low-Trajectory Turbine Missiles," Position C.1, and 1.117, "Tornado Design Classification," Appendix Position 13. 2. The applicant has met the requirements of GDC 5, "Sharing of Structures, Systems and Components," with respect to capability of shared systems and components important to safety to perform required safety functions. Each unit of the plant has its own emergency diesel generators, whose EDESS is not shared between the diesel generators. 3. The applicant has met the requirements of GDC 17, "Electric Power Systems," with respect to the capability of the air starting system to meet independence and redundancy criteria. Each EDESS is independent and physically separated from the other system serving the redundant diesel generator. A single failure in any one of the systems will affect only the associated diesel generator. Each of the starting systems is capable of cranking a cold diesel engine five times without recharging the air receiver(s). This meets the positions of Regulatory Guide 1.9, "Selection, Design, and Qualification and Testing of Emergency Diesel-Generator Units Used as Class 1E Standby (Onsite) Electric Power Systems at Nuclear Power Plants." The applicant has also met the positions of Branch Technical 52 Position ICSB-17(PSB), "Diesel Generator Protective Trip Circuit Bypasses," and NUREG/CR-0660,