Document: NUREG-0800
Document ID: 9cfc38bf-7808-446e-a43d-4ca9ff55df2a
Document Type: srp
Title: AC POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1007/ML100740289.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
nd manage the increase in risk that may result from proposed maintenance activities before performing the maintenance activities. Grid stability and offsite power availability are examples of emergent conditions that may result in the need for action prior to the conduct of the assessment or that could change the conditions of a previously performed assessment. Accordingly, licensees should perform grid reliability evaluations as part of the maintenance risk assessment before performing Agrid-risk-sensitive@ maintenance activities (such as surveillances, post-maintenance testing, and preventive and corrective maintenance). Such activities are those which could increase risk under existing or imminent degraded grid reliability conditions, including (1) conditions that could increase the likelihood of a plant trip, (2) conditions that could increase the likelihood of a LOOP or SBO, and (3) conditions that could have an impact on the plant=s ability to cope with a LOOP or SBO, such as out-of-service risk-significant equipment (for example, an emergency diesel generator (EDG), a battery, a steam-driven pump, or an AAC power source). III. REVIEW PROCEDURES The primary objective in the review of the ac power system is to determine that this system satisfies the acceptance criteria stated in Subsection II and will perform its design functions during plant normal operation, anticipated operational occurrences, accident conditions, and post-accident conditions. To ensure that acceptance criteria stated in Subsection II are satisfied, the review is performed as detailed below. The primary reviewer will coordinate this review with the other branch areas of review as stated in Subsection I. The primary reviewer obtains and uses such input as necessary to ensure that this review procedure is complete. The reviewer will select material from the procedures described below, as may be appropriate for a particular case. 8.3.1-20 Revision 4 - May 2010 These review procedures are based