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:
n only be used for isolating the unit generator for the purpose of providing a delayed access offsite source. 2. Generator circuit breakers should be designed to perform their intended function during steady-state operation, power system transients and major faults; tests should be performed on the circuit breaker to verify these capabilities. As a minimum, the following performance tests and capabilities should be demonstrated: a. Dielectric Tests The circuit breaker should be given dielectric strength tests in accordance with the requirements and ratings contained in the applicable ANSI C37 series standards (References 4, 5, and 6). 8.2-11 Rev. 0 - July 1983 b. Load Current Switching For applications which use only one generator circuit breaker, the circuit breaker should be cycled through 40 load interruption operations (a lesser number requires suitable justification) at a current equal to the normal full load continuous current rating of the circuit breaker. For applications which utilize two generator circuit breakers in a parallel circuit, the circuit breaker should be given 40 load interruption operations (a lesser number requires suitable justification) at a current equal to twice the normal full load continuous current rating of the circuit breakers. The procedures and acceptance criteria utilized for this test should be based upon those given in ANSI C37.06 and C37.09. c. Fault Current Interrupting Capability The circuit breaker should have, as a minimum, the capability of interrupting the maximum assymetrical and symmetrical fault current availble at the instant of primary arcing contact separa- tion. This current should be calculated by assuming a bolted three phase fault at a point on the system which causes the maximum amount of fault current flowing through the generator circuit breaker. The fault current interrupting capabiltiy (short circuit current rating) of the circuit breaker should be demonstrated by performing a series of tests similar to