Document: NRC Regulatory Guide
Document ID: e7cef6d0-2869-4d77-9a08-126120ae6043
Document Type: regulatory_guide
Title: Fuel Oil Systems for Emergency Power Supplies + HISTORY – HISTORY 06/2012 – DG-1282 , Proposed Revision 2 Prior to the issuance of DG-1282, RG 1.137 was entitled "Fuel –Oil Systems for Standby Diesel Generators (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1210/ML121090447.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.137
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CFR Title: 

Content:
ety-related emergency diesel generators. The standard does not specifically address quality assurance, and in this regard, ANSI/ANS-59.51-1997 should be used in conjunction with Regulatory Guide 1.28, Revision 4, "Quality Assurance Program Requirements (Design and Construction)" (Ref. 6), which endorses ANSI/ASME NQA-1-2008 (Ref. 7) and the NQA-1a-2009 Addenda (Ref. 8), DG-1282, Page 4 "Quality Assurance Program Requirements for Nuclear Power Plants," for the design, construction, and maintenance of the fuel oil system. 4. ANSI/ANS-59.51-1997 requires, in part, that the onsite fuel oil storage capacity for each diesel generator be sufficient to operate the diesel generator following any design basis event either for 7 days or for the time required to replenish the fuel from sources outside the plant site, following any design basis event without interruption of the operation of the diesel generator, whichever is longer. New reactor designs should provide independent 7 day storage for each emergency power supply train diesel generator or gas turbine set. All safety-related emergency power supply fuel oil systems should include the full 7-day supply in the fuel oil supply tank and should assume that the supply cannot be replenished for at least 7 days following the design basis event. The 7 day allowance assumes sufficient offsite supplies are available for continuous replenishment for a mission time of at least 30 days credited in the plant safety analyses. Pre-disaster agreements for fuel oil replenishment should be established in the event a natural calamity invokes widespread fuel shortages or results in extended outage of the transmission network. Furthermore, with sufficient warning that a disaster is approaching, temporary diesel tanks can provide extended running time, as disaster conditions can temporarily prevent access to the plant site for replenishment of fuel oil supplies. 5. Section 5.4, “Calculation of Usable Fuel Oil Storage Requirements,”