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:
s of plant switchyard or safety bus voltages. Recent operating experience (Reference 43) has shown that analyses of the surrounding grid and plant conditions, based on accurate and timely transmission system data, are needed to evaluate all possible contingencies at a given time. The reviewer should verify that adequate status information, communications, analytical resources, and procedures are provided to determine that the plant is operating within the offsite power grid operability limits required by GDC 17 and the plant=s TS. The information and guidance provided in NRC generic communications (Reference 21), industry standards (Reference 50), and other NRC documents (e.g., References 22, 24, 25, 29, 30, and 43) are useful in the review of the adequacy and reliability of the plant=s interface with the offsite power grid and communication with offsite transmission system operating authorities. K. The reviewer should verify that adequate procedures, administrative controls, and protocols are in place to ensure that no modifications to the offsite power system circuits credited for satisfying GDC 17 are implemented by offsite transmission system operating authorities, responsible for maintenance, modification, and operation of the offsite transmission grid, without the performance of a proper safety evaluation. The safety evaluation of transmission 8.2-21 Revision 5 - May 2010 system modifications is required to ensure that the transmission grid configuration, stability, and capability remain within the assumptions of the plant safety analyses. Further information on potential unreviewed safety questions associated with modifications to offsite transmission circuits can be found in Reference 45. In addition, the reviewer should verify that grid reliability evaluations are performed for maintenance or modifications to the offsite power system, as part of the maintenance risk assessment required by 10 CFR 50.65 before performing Agrid-risk-sensitive@ maintenance