Document: NUREG-0800
Document ID: 81256f55-72dd-4777-9472-f373c71c4554
Document Type: srp
Title: AC POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550065.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
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). 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 Regulatory Guide 1.47 and Branch Technical Position 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 Regulatory Guide 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 Regulatory Guide 1.155. Regulatory Guide 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 station blackout considerations. The reviewer verifies that the reliability program includes provisions that conform with Position C.1.2 of Regulatory Guide 1.155 and Positions C.2.2 and C.2.3 of Regulatory Guide 1.9. The reviewer also verifies that the effectiveness of maintenance activities under the program are monitored in accordance with the Maintenance Rule (10 CFR 50.65) and