Document: NUREG-0800
Document ID: 82c03523-2d2b-49d4-a06b-4def71350079
Document Type: srp
Title: EMERGENCY DIESEL ENGINE FUEL OIL STORAGE AND TRANSFER SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070680388.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.4
CFR Part: 
CFR Title: 

Content:
ance of damage from vehicles, tornado, tornado missiles, and floods. The fill and vent point should be located higher than the probable maximum flood level. Each tank also has a stick gauge connection for determining its fuel level. B. The minimum onsite inventory of fuel oil for each diesel generator system is sufficient to enable the diesel generators to power required engineered safety features for a period of seven days or longer as specified by ANSI/ANS-59.51 following any DBA and loss of offsite power. C. The physical location of the day tank for each diesel-generator set is located at an elevation for a slight positive pressure at the engine-driven fuel oil pump(s). Where this requirement is contrary to manufacturer recommendations, the SAR must provide justification and a detailed system description. Additionally, justification for locating the day tank otherwise must confirm that the diesel-generator unit can start automatically and attain the required voltage and frequency within an acceptable time. Any required booster pump must be powered from a reliable power supply, operate when the engine receives a start signal, and operate during the engine starting cycle or until system fuel oil pressure is established by the engine-driven fuel oil pump. D. A day or integral tank overflow line returns excess fuel oil delivered by the transfer pump back to the fuel oil storage tank. E. A low-level alarm enables the operator to accomplish minor repairs or maintenance before all fuel in the day or integral tank is consumed (assuming full-power operation). F. The day or integral tank and storage tanks for each diesel-generator set include provisions for removal of accumulated water. 7. The reviewer verifies whether suitable precautions will be taken, after the fuel oil tank has been filled, to exclude sources of ignition like open flames or hot surfaces and whether protective measures like compartmentation of redundant elements minimize the potential for and