Document: NUREG-0800
Document ID: cad7a703-c5bb-48ce-bbc4-d11359471665
Document Type: srp
Title: through 9.5.8 cover the review of various essential elements of the emergency
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350037.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.5.4
CFR Part: 
CFR Title: 

Content:
associated with each diesel- generator set is located at an elevation to assure a slight positive pressure at the engine-driven fuel oil pump(s). Where this require- ment is contrary to manufacturers' recommendation, justification and a detailed system description shall be provided in the SAR. Addi- tionally, the justification for locating the day tank other than stated abqve shall assure that the diesel-generator unit can start automatically and attain the required voltage and frequency within acceptable limits and time. If a booster pump is required, it shall be powered from a reliable power supply and arranged to operate when the engine receives a start signal and it shall 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 is provided to return excess fuel oil delivered by the transfer pump back to the fuel oil storage tank. e. A low-level alarm is provided to enable 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 associated with each diesel- generator set include provisions for removal of accumulated water. 7. The reviewer verifies that suitable precautions will be taken, once the fuel oil tank has been filled, t6-exclude sources of ignition such as open flames or hot surfaces, and that protective measures such as compartmenta- tion of redundant elements are used to minimize the potential causes and consequences of fires and explosions. 9.5.4-5 Rev. 2 - July 1981 8. The reviewer verifies that the system function will be maintained as required in the event of failure of nonseismic Category I systems or struc- tures located near the system. Reference to the SAR sections describing site features and the general arrangement and layout drawings will be neces- sary in this determination. Plant arrangement features,