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:
er 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 “grid-risk-sensitive” maintenance activities, are considered when evaluating the operability of the offsite power system. 8.2-19 Revision 4 - March 2007 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 offsite power system and preferred actions for recovering from a LOOP event. It should also include the use of transmission load flow analysis and real time contingency analysis (RTCA) software tools (analysis tools) (directly or through the TSO) to assist the NPP in monitoring grid conditions and operating status to determine the operability of offsite power systems under plant technical specifications (TS). The review should verify that the communication protocols are enforced by a formal contract or other means and include notification requirements to inform the NPP when the grid is stressed to the point where a trip of the NPP would result in inadequate post-trip