Document: NUREG-0800
Document ID: 12f45e44-74bc-4a6b-933a-2fd6bc43c6dd
Document Type: srp
Title: deals with the fuel oil storage and transfer system for these diesel engines up to the engine
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070569.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.4
CFR Part: 
CFR Title: 

Content:
the emergency diesel engine following an engine start signal. In order to ensure the availability of emergency ac power to safety-related components, the EDEFSS must be designed to perform this safety function in each unit regardless of events, failures, and conditions in the other unit(s). Compliance with GDC 5 provides assurance that equipment failures and events occurring in one unit of the site will not propagate to other units of the site. 4. GDC 17, in relevant part, requires provision of an onsite electric power system to permit the functioning of structures, systems and components important to safety. GDC 17 requirements include that the onsite electric power system have sufficient independence and redundancy to perform their safety functions assuming a single failure. Typically, the emergency diesel generator system is the onsite electric power system relied upon to meet these requirements. The diesel engine fuel oil storage and transfer system is integral to the emergency diesel generator system. Regulatory Guides 1.9 and 1.137 provide regulatory positions with regard to EDE and fuel oil system design criteria and features applicable to GDC 17 compliance. Meeting the GDC 17 requirements provides assurance that electric power will be available for systems necessary to: 1) prevent fuel damage in the event of anticipated operational occurrences; and 2) maintain core cooling and containment integrity in the event of postulated accidents. 5. 10 CFR 50.63 requires that each light-water-cooled nuclear power plant be able to withstand and recover from a station blackout (i.e., loss of the offsite electric power system concurrent with reactor trip and unavailability of the onsite emergency ac electric power system). Paragraph (a)(2) of 50.63 establishes the conditions under which provision of an alternate ac (AAC) power source will constitute acceptable capability to withstand station blackout. Regulatory Guide 1.155 describes a method acceptable to the NRC staff