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:
tex effect could impact system performance. The location of this suction connection should be at an elevation that prevents influx of particulates that could plug filters and strainers and should also consider the extent of accumulation of sludge over time based on the plant’s maintenance program for the supply tank. 5.3. Account for any reduced performance when using alternative fuels or changes in energy content of available fuel oil [e.g., a 2% or more capacity change (as applicable) for use of ultra low sulfur diesel (ULSD) fuels]. 5.4. Storage capacity calculations should be based on the limiting heat content of the fuel oil that is specified in plant procedures. DG-1282, Page 5 6. Section 6.2.4, “Physical Arrangement,” of ANSI/ANS-59.51-1997 states that “the location of day or integral tanks shall be as required by the diesel-engine manufacturer.” In addition to this requirement, the physical location of the day tank (relative to the engine and design of the engine fuel system, including gas turbine fuel oil systems) should take into account: 6.1. Net positive suction head requirement of the pump fed from the day tank, 6.2. Potential need for electric fuel pumps powered from a reliable power supply to ensure that the diesel generator unit can start automatically and attains the required voltage and frequency within acceptable time, and 6.3. Assurance that flooding and other postulated hazards under design basis events will not cause system inoperability. GDC 2, “Design Bases for Protection Against Natural Phenomena,” has the following requirements – Structures, systems, and components important to safety shall be designed to withstand the effects of natural phenomena such as earthquakes, tornadoes, hurricanes, floods, tsunami, and seiches without loss of capability to perform their safety functions. The design bases for these structures, systems, and components shall reflect: (1) Appropriate consideration of the most severe of the natural