Document: NRC Regulatory Guide
Document ID: 74c49394-8dbf-46e7-b62a-b85de93b47d8
Document Type: regulatory_guide
Title: Initial Test Programs for Water-Cooled Nuclear Power Plants + HISTORY - HISTORY 11/2012 – DG-1259 , Proposed Revision 4 11/2006 – DG-1166 , Proposed Revision 3 (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1229/ML12298A071.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.68
CFR Part: 
CFR Title: 

Content:
umentation and controls, will perform as designed: 1. circulating water system 2. ultimate heat sink cooling towers and associated auxiliaries 3. raw water and service water cooling ultimate heat sink systems A-1.g. Electrical Systems The plant electrical systems include the normal alternating current (ac) power distribution system, the emergency ac power distribution system including vital buses, the emergency ac power supplies or sources, and the direct current (dc) systems. Appropriate system and component tests should be conducted to verify, to the extent practical, that these systems will operate in accordance with design: 1. Normal AC Power Distribution System. Demonstrate proper operation of: a. protective devices, b. initiating devices, c. relaying and logic, d. transfer schemes and trip devices, e. permissive and prohibit interlocks, f. instrumentation and alarms, and load shedding features. Testing should also be conducted to demonstrate proper operation and load carrying capability of: a. breakers, b. motor controllers, c. switchgear, d. transformers, and e. cables. This testing should simulate, as closely as practical, actual service conditions (e.g., fully loading motor control centers and operation of supplied loads at rated conditions). Redundancy and electrical independence should be demonstrated where appropriate (see footnote 3). Tests should demonstrate that the integrated system will perform as designed in response to simulated partial and full losses of offsite power sources. Tests also should demonstrate degraded protection systems designed to transfer from offsite to onsite power sources during degraded voltage conditions. Appendix A to DG-1259, Page A-7 2. Emergency AC Power Distribution System. Demonstrate proper operation of: a. protective devices, b. relaying and logic, c. transfer and trip devices, d. permissive and prohibit interlocks, e. instrumentation and alarms, and f. load shedding or stripping features. Testing should also be