Document: NUREG-0800
Document ID: 61198d64-419c-45ea-aebb-cf34c3b171fe
Document Type: srp
Title: Revision 0 – July 2015
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1505/ML15057A085.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8
CFR Part: 
CFR Title: 

Content:
. (iv) The unbalanced voltage/current conditions for ESF components expected during various operating and loading conditions should not exceed motor manufacturer’s recommendations. The International Electrotechnical Commission (IEC) Standard IEC 60034-26, National Electrical BTP 8-9-6 Revision 0 – July 2015 Manufacturers Association (NEMA) Standard (MG 1) Parts 14.36 and 20.24, and IEEE Std C37.96-2012 (Guide for AC Motor Protection), Section 5.7.2.6, “Unbalanced Protection and Phase Failures,” may be used for general guidance. Technical Specification Surveillance Requirements and Limiting Conditions of Operation for equipment used for mitigation of OPCs should be identified and implemented consistent with the operability requirements specified in the plant TSs and in accordance with 10 CFR 50.36(c)(2) and 10 CFR 50.36(c)(3). RG 1.93 “Availability of Electric Power Sources,” provides additional guidance on this topic. 3. For new reactor licensees, COL applicants, and applications for certification of designs incorporating passive safety features reviewed under 10 CFR Part 52, the following criteria should be satisfied when evaluating OPCs: a. The OPC should be automatically detected and alarmed in the main control room under all operating electrical system configurations and plant loading conditions. The detection circuits should be sensitive enough to identify OPCs under all operating electrical system configurations and plant loading conditions for which the offsite power source is normally required in accordance with Appendix A to 10 CFR Part 50, GDC 17. b. Following detection of an open phase condition and alarm in the control room, plant procedures should specify operator actions to ensure the standby diesel generators are connected to the auxiliary alternating current buses if they are not automatically connected in accordance with the design basis or restore the offsite power source to a functional condition. c. Periodic surveillance tests should