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:
e 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 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). In addition, tests should demonstrate that emergency or vital loads will start in the proper sequence and operate under simulated accident conditions with both the normal (preferred) ac power source and the emergency (standby) power source. Emergency loads should also be tested to demonstrate that they can start and operate with the maximum and minimum design voltage available. To the extent practical, the testing of emergency or vital loads should be conducted for a sufficient period of time to provide assurance that equilibrium conditions are attained. System redundancy and electrical independence should be demonstrated where appropriate (see footnote 3). Loads supplied from the system, such as motor-generator sets with flywheels, which are designed to provide non-interruptible power to plant loads should be tested to demonstrate proper operation. If applicable for the facility design, testing should include under frequency and under voltage relays associated with such motor-generator sets. Full load tests for vital buses should be conducted using normal and emergency power supplies to the bus. Testing also should demonstrate the adequacy of the plant’s emergency and essential lighting system. In addition, tests should be conducted to demonstrate proper operation of indicating and alarm devices used to monitor the availability of the emergency power system in the control room. 3. Emergency or Standby AC Power Supplies. Conduct