NB (Non Class 4.16kV AC)

Question 1

Which one of the following identifies the meaning of a red light (RL) being lit at the local breaker panel for NBNS01J, Turbine Cooling Water Pump “A”?

A. The breaker is open and trip coil circuit continuity is satisfactory.
B. The breaker is closed and trip coil circuit continuity is satisfactory.
C. The breaker is closed and the closing springs are charged.
D. The breaker is closed (there is no other input to the red light).

Answer 1

Answer: B

Question 2

Unit operating in Mode 1. A loss of control power occurs to NBN-S02. A three phase short occurs on the motor for the “B” Nuclear Cooling Water pump. How does the electric plant respond to this scenario?

A. The Main Feed breaker (at NBN-S02) will lockout to clear the fault.
B. The “B” NCW pump breaker will trip on overcurrent.
C. The NBN-X02 Feed breaker (at NAN-S02) will lockout to clear the fault.
D. NO protective actuations will occur. This fault must be cleared by the operator.

Answer 2

Answer: C

Question 3

Which of the following describes the function of the “Kirk Key” Interlock found on 480 V Load Centers?

A. Resets the relays on the load centers.
B. Fail safe switch which prevents the Load Interrupter from being opened under load.
C. Turns the charging motor disconnect switch from ON to OFF.
D. Fail safe device to prevent the closing springs from discharging while racking in the breaker.

Answer 3

Answer: B