Document: NUREG-0800
Document ID: 98a045ec-37ef-46fc-9eaa-9e695c2d6e53
Document Type: srp
Title: OFFSITE POWER SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350488.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.2
CFR Part: 
CFR Title: 

Content:
ution system buses. This evaluation will include a review of the electrical protective relaying and breaker control circuits and power supplies to assure that loss of one preferred system circuit will not cause or result in loss of the redundant counterpart, nor any standby power source. 3. Design information and analyses demonstrating the suitability of the power sources from the grid, including transmission lines, breakers, and transformers used for supplying preferred power from distant sources are reviewed to assure that each path has sufficient capacity and capability to perform its intended function. This will require examination of loads required to be powered for each plant operating conditions; continuous and fault ratings of breakers, transformers, and transmission lines; loading, unloading, and transfer effects on equipment; and power capacity available from each source. 4. The instrumentation required for monitoring and indicating the status of the preferred power system is reviewed to assure that any change in the preferred power system which would prevent it from performing its intended function will be immediately identified by the control room operator. Also, all instrumentation for initiating safety actions associated with the preferred power system is reviewed. 5. The capability to test the preferred power system is reviewed. 6. Environmental conditions such as those resulting from floods, hurricanes, high and low atmospheric temperatures, rain, snow and ice are considered in the review of the preferred power system to determine any effects on function. 7. Quality group classifications of equipment of the preferred power system are reviewed. In the review of other areas associated with the offsite, the PSB will coordi- nate other branches' evaluations that interface with the overall review of the system as follows: The Reactor Systems Branch (RSB) determines those system components requiring electric power as a function of time for each mode of