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:
OP due to loss of the real and/or reactive power support supplied to the grid from the nuclear unit. Plant TS LCOs require the offsite power system to be operable. However, since the capability of the offsite power system cannot be tested except when challenged during an actual event, the design bases for the offsite power system can only be assured through analysis of the grid and plant conditions. Plant operators should, therefore, be aware of: (1) the capability of the offsite power system to supply power, as required by TS, during operation and (2) situations that can result in a LOOP following a trip of the plant. Plant operators are expected to declare the offsite power system inoperable in the event of degraded grid conditions that can not support post-trip voltages. Further, the reviewer should verify that communications (both voice and data) between the NPP and its offsite transmission system operating authorities must be implemented in assessing whether the offsite power sources are operable as required by GDC17 and the plant TS. In addition, the reviewer should verify that grid reliability evaluations, performed as part of the maintenance risk assessment required by 10 CFR 50.65 before conducting Agrid-risk-sensitive@ maintenance activities, are considered when evaluating the operability of the offsite power system. 8.2-20 Revision 5 - May 2010 The applicant=s methods and procedures for confirming the operational readiness of offsite power systems are reviewed to verify that plant operators are aware of the capability of the offsite power system to supply power during operation and situations that can result in a LOOP following a trip of the plant. This includes a review of communication agreements and protocols that exist between the NPP and the transmission system operator (TSO), independent system operator (ISO), or reliability coordinator/authority (RC/RA). The agreements and protocols should be verified to include preferred operating limits for the