Document: NUREG-0800
Document ID: 81256f55-72dd-4777-9472-f373c71c4554
Document Type: srp
Title: AC POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550065.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
s and physical arrangement drawings. The diesel generator sets are reviewed to verify that the bases for their 8.3.1-28 Revision 3 - March 2007 selection satisfy the positions of Regulatory Guide 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 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 generator capacity, an acceptable design should satisfy Positions C.1.2 and C.1.3 of Regulatory Guide 1.9. Further guidance on the review of capacity, capability and reliability criteria of standby power supplies and onsite power system design analysis studies is provided in industry standards (References 47, 48 and 56) and, for COL applications that are not based on certified ALWR designs, in Regulatory Guide 1.206, Section C.I.8.3.1. Regulatory Guide 1.206, Section C.III.1, Chapter 8, provides similar guidance for COL applications that are based on certified ALWR designs. To ensure that each diesel generator is