Document: NUREG-0800
Document ID: 9cfc38bf-7808-446e-a43d-4ca9ff55df2a
Document Type: srp
Title: AC POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1007/ML100740289.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
hts of internal and industry-wide operating experience. 4. Standby Power Supplies The reviewer should ensure that the requirements of GDC 17 and the recommendations of IEEE Std. 308 have been met with regard to the standby power supply (diesel generator sets) having sufficient capacity and capability to supply the distribution system loads. In addition, the reviewer should verify that the standby power supply meets the design bases and design criteria, and should have analyses to support the design. Further, the reviewer should verify that the standby power supply has been described and implemented as depicted on electrical drawings and physical arrangement drawings. The diesel generator sets are reviewed to verify that the bases for their selection satisfy the positions of RG 1.9. Specifically, the reviewer first becomes familiar with the purpose and operation of each safety system, including system component arrangement as depicted on physical arrangement drawings, expected system performance as established in the accident analyses, modes of system operation and their interactions during normal and accident conditions, and interactions between systems. Following this, it is verified that the tabulation of all safety-related loads to be connected to each diesel generator is consistent with the information establishing the 8.3.1-28 Revision 4 - May 2010 safety-related systems and loads and their redundancy. The characteristics of each load (such as motor horsepower, volt-amp rating, in-rush current, starting volt-amps, and torque), the length of time each load is required, and the basis used to establish the power necessary for each safety load (such as motor nameplate rating, pump run-out condition, or estimated load under expected flow and pressure) are used to verify the calculations establishing the combined load demand to be connected to each diesel during the "worst" operating condition. In applying this combined load demand to the selection of each diesel