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:
by 10 CFR 50.65 before performing Agrid-risk-sensitive@ maintenance activities, including, but not limited to, surveillances, post-maintenance testing, and corrective and preventive 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 LOOP or SBO, and (3) conditions that have an impact on the plant=s ability to cope with a LOOP or SBO, such as out-of-service risk-significant equipment (e.g., an EDG, a battery, a steam-driven pump, and alternate ac power source). 8.3.1-33 Revision 4 - May 2010 The descriptive information and the design implementation (as depicted on electrical drawings) of the means proposed for automatically indicating at the system level a bypassed or deliberately inoperative status of a redundant portion of a safety-related system are reviewed to ascertain that the design is consistent with RG 1.47 and BTP 8-5. This position establishes the basis to be considered in arriving at an acceptable design for the inoperable status indication system. 8. Reliability Program for Emergency Onsite AC Power Sources RG 1.155 provides guidance for setting minimum reliability goals for emergency onsite ac power sources. Review is conducted in accordance with SRP Section 8.4 to verify that the target reliability for such sources satisfy the positions of RG 1.155. RG 1.155 also recommends that the reliable operation of emergency onsite ac power sources be ensured by a reliability program designed to maintain and monitor the reliability level of each power source over time for assurance that the target reliability levels are being achieved. The reliability program is reviewed to verify its adequacy with respect to SBO considerations. The reviewer verifies that the reliability program includes provisions that conform with Position C.1.2 of RG 1.155 and Positions