Document: NUREG-0800
Document ID: b75d082b-2493-4543-981a-2ee136d737cf
Document Type: srp
Title: BTP 8-9-1
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1405/ML14057A433.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8
CFR Part: 
CFR Title: 

Content:
site power circuit on the high voltage side of a transformer connecting an offsite power circuit to the transmission system under all operating electrical system configurations and loading conditions. 1. Nuclear Power Plants with Active Safety Features For performing licensing reviews for operating reactors and new reactors with active safety features plant designs under 10 CFR Part 50 and 10 CFR Part 52, the following criteria should be satisfied: I. Detection and Alarms An open phase condition should be automatically detected and alarmed in the control room unless it can be shown that the open phase condition does not prevent functioning of important-to-safety SSCs. Detection circuits for the open phase condition, which prevents the functioning of important-to-safety SSCs, should be sensitive enough to identify an open phase condition under all operating electrical system configurations and loading conditions for which they are required to be operable. II. Actuation circuits The design of actuation circuit should minimize misoperation, maloperation, and spurious actuation of an operable off-site power source by providing independent dual sensors and coincidence logics. Additionally, the protective scheme should not separate the operable off-site power source in the range of voltage perturbations such as switching surges, load or generation variations etc., normally expected in the transmission system. Licensees/applicants should perform failure modes analysis to demonstrate that the additional actuation circuit design does not result in lower overall plant operation reliability. These devices must be coordinated with other protective devices in both the transmission system and the plant’s electrical system (e.g., fault protection, overcurrent, etc.). III. Circuit Classification Class 1E detection and actuation circuits at the ESF bus level meet the applicable requirements of GDC 17. A non-Class-1E detection and actuation circuit at the non-Class1E level may be