Document: NUREG-0800
Document ID: 97120913-d26f-4324-ab62-22f3f5b73925
Document Type: srp
Title: and 8.3.2.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0636/ML063600410.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
ic strength of a generator circuit breaker should be demonstrated by subjecting it to high voltages, both rated power frequency withstand voltage and rated full wave impulse withstand voltage based on its rated maximum voltage. (ii) Load Current Switching. Tests are made to determine the ability of the generator circuit breaker to switch load current up to the rated continuous current of the generator, such as load currents that may be encountered in normal service. When switching the generator from the system, both generator circuit breaker terminals remain energized. The power frequency recovery voltage appearing across the generator circuit breaker is equal to the sum of voltage drops on the reactances of the generator and transformer and the corresponding short-circuit reactance of the high-voltage system. 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 IEEE Std C37.013. (iii) Short Circuit Current Rating. The rated short-circuit current is demonstrated by a series of symmetrical and asymmetrical tests, and close-open tests described in the standard. The rated symmetrical current shall be the rated current value with the power frequency voltage associated with the rated maximum voltage and with a rated inherent transient recovery voltage as described in IEEE Std C37.013 for system- source faults and generator-source faults. The rated