Document: NUREG-0800
Document ID: 853719df-a6ea-408b-8d43-5956155abc38
Document Type: srp
Title: and 8.3.2.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1007/ML100740246.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
sign limits of equipment are not exceeded. Industry standards (References 46 & 48) and, for COL applications, RG 1.206 (Section C.I.8.2.2), provide further information for the reviewer regarding power system analytical studies to verify the capability of the offsite power systems and their interfaces with the onsite power system. F. The results of the grid stability analysis must show that loss of the largest single supply to the grid does not result in the complete loss of preferred power. The analysis should consider the loss, through a single event, of the largest capacity being supplied to the grid, removal of the largest load from the grid, or loss of the most critical transmission line. This could be the total output of the station, the largest station on the grid, or possibly several large stations if these use a common transmission tower, transformer, or a breaker in a remote switchyard or substation. The station layout and the grid system layout drawings are reviewed to determine that all the above events were included in the analysis. BTP 8-6, industry standards (e.g., References 46 & 48), and, for COL applications, RG 1.206 (Section C.I.8.2.2) provide further information for the reviewer regarding stability studies of offsite power systems. The reviewer verifies that the grid stability analysis considers the effect of grid events on the adequacy of offsite grid voltage available at the plant switchyard. Operating experience has shown that a variety of factors, such as, power flow 8.2-18 Revision 5 - May 2010 through the transmission grid, reactive power capacity, the plant voltage and frequency protective schemes and setpoints, and weather or temperature conditions in the region can all affect grid voltage levels and overall stability. BTP 8-6 and References 21, 25, 29, 30, and 43 provide information for the reviewer regarding degraded transmission grid voltage and the effects of grid events on grid voltage at the plant switchyard. The applicant should