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:
loss of the latter. Industry standards (References 47, 48, and 56) and, for COL applications that are not based on certified ALWR designs, Regulatory Guide 1.206, Section C.I.8.3.1.2, provide further information for the reviewer regarding power system analysis studies - including load flow with voltage regulation, short circuit analysis, equipment sizing studies, protective relay setting and coordination, motor starting, grounding system design and insulation coordination - to verify the capability of the onsite ac power system 8.3.1-26 Revision 3 - March 2007 and the interface with the offsite power system. Regulatory Guide 1.206, Section C.III.1, Chapter 8, provides similar guidance for COL applications that are based on certified ALWR designs. The analysis of the onsite ac power system should consider the effects of the offsite power system, particularly the grid voltage, on the capability of the onsite system and the response of the undervoltage relaying. The review should ensure 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 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. Branch Technical Position 8-6 and References 7 and 13 provide information for the reviewer regarding degraded transmission grid voltage and the effects of grid events on grid voltage at the plant switchyard. Detailed review regarding the analysis of grid operating conditions and stability and their potential interactions with the onsite power system is covered in SRP Section 8.2 , "Offsite Power System." In reviewing the mode of operation where both power systems are being operated in parallel (such is the case during full-load testing of