Class 4.16kV (PB) Flashcards
Which of the following will prevent paralleling power sources when LOCALLY closing the PBA-S03 Alternate Supply breaker?
A. Synch Check relay must be satisfied.
B. Both of the other feed breakers (D/G and Normal) to this bus must be OPEN.
C. Synch Switch on B01 for this breaker in ON.
D. Synch switch on the local panel for this breaker must be ON.
Answer: B
A LOCA has resulted in a reactor trip and SIAS/CIAS initiation. The primary operator notices a “brighter than normal green” indication for the “A” HPSI pump. This operator, noting that this pump should be running, takes the control switch to the TRIP position and releases. Which one of the following describes the effect, if any, of this action?
A. Nothing will happen.
B. The lockout relay will reset and the breaker will close and trip again if the initial fault is not cleared.
C. The pump will enter an anti-pump condition.
D. The lockout relay will reset and the breaker will close with its protection circuits bypassed.
Answer: B
Unit is in Mode 5 The B Diesel Generator is Out of Service and tagged out. You have been directed to transfer PBB-S04 from its normal to its alternate power source at the switchgear to support outage power configuration. Which of the following describes the correct sequence to perform this operation?
A. After verifying that off-site power is supplying both the normal and alternate power supplies, close the alternate breaker using the local control switch at PBB-S04. After the breaker is closed, open the normal feed breaker at PBB-S04 completing the transfer.
B. Trip the normal feeder breaker using the local switch at PBB-S04. After the breaker is open, close the alternate feeder breaker at PBB-S04 completing the transfer.
C. Have the control room verify that the power supplies are in-phase. When this is done, close the alternate breaker using the local control switch at PBA-S04. After the breaker is closed, open the normal feed breaker at PBB-S04 completing the transfer.
D. After verifying that the power supplies are in-phase using the local synch check indication, close the alternate breaker using the local control switch at PBA-S04. After the breaker is closed, open the normal feed breaker at PBB-S04 completing the transfer.
Answer: B
In order to close in the alternate feed breaker to PBA-S03 locally (using the local Control Switch), which of following interlocks MUST be satisfied?
A. Both the DG and normal supply breakers to this bus are open ONLY.
B. Synch Check relay satisfied ONLY.
C. Synch Switch on B01 for this breaker in ON.
D. Synch Check relay satisfied AND both the DG and normal supply breakers to this bus are open.
Answer: A
With a unit operating in Mode 1, which of the following describes the required AC Electrical sources which satisfies the LCO of Tech Spec 3.8.1, AC Sources - Operating?
A. One offsite circuit and one diesel generator each capable of supplying the onsite Class 1E Electrical Power Distribution System and one automatic load sequencer.
B. Two offsite circuits and two diesel generators each capable of supplying onsite Class 1E Electrical Power Distribution System and both automatic load sequencers.
C. One offsite circuit and one diesel generator each capable of supplying the onsite Class 1E Electrical Power Distribution System and both automatic load sequencers.
D. Two offsite circuits and two diesel generators each capable of supplying the onsite Class 1E Electrical Power Distribution System and one automatic load sequencer.
Answer: B
Which ONE of the following Unit combinations can be simultaneously energized by the GTGs?
A. 1 and 3 only
B. 1 and 2; or 1 and 3
C. 1 and 2; or 2 and 3
D. 1 and 3; or 2 and 3
Answer: B
In addition to providing breaker position information, the “RED” indicating light on a 4160 Class breaker (cubicle door) also indicates that the:
A. anti-pump circuitry has continuity.
B. closing spring is charged.
C. protective relays are functioning.
D. trip coil has continuity.
Answer: D
Unit is operating at rated power. One Diesel Generator becomes inoperable. Which one of the following Tech Spec actions must be completed within one hour?
A. Verify correct breaker alignment and indicated power availability for two offsite power sources.
B. Restore DG to operable status.
C. Determine that DG “B” is not inoperable due to a common cause failure.
D. Declare required feature(s) supported by DG inoperable when its redundant required feature(s) is inoperable.
Answer: A
