Document: NUREG-0800
Document ID: 97120913-d26f-4324-ab62-22f3f5b73925
Document Type: srp
Title: and 8.3.2.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0636/ML063600410.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
rs or generator load break switches, then the reviewer should use the guidelines contained in Appendix A to this SRP section. E. Each of the circuits from the offsite system to the onsite distribution buses shall have the capacity and capability to supply the loads assigned to the bus or buses it is connected to during normal or abnormal operating conditions, accident conditions, or plant shutdown conditions. Therefore, the loads to be supplied during these conditions should be determined from information obtained in coordination with other staff. The capacity and electrical characteristics of transformers, circuit breakers, buses, transmission lines, other electrical equipment, and the preferred power source for each path should be evaluated to ensure that there is adequate capability to supply the maximum connected load during all plant conditions. The design should also be examined to ensure that during transfer from one power source to another the design limits of equipment are not exceeded. Industry standards (References 46 & 48) and, for COL applications, Regulatory Guide 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