NN: Non-Class 120 VAC Flashcards Preview

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Flashcards in NN: Non-Class 120 VAC Deck (8)
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1

Which NN buses are grounded and which are ungrounded?

NNN-D11 and NNN-D12 are ungrounded
NNN-D15 and NNN-D16 are grounded

2

What are the normal and backup power supplies for NNN-D11 and NNN-D12?

Normal: Non-Class MCC through a Voltage Regulator
Backup: Class MCC

3

What are the normal and backup power supplies for NNN-D15 and NNN-D16?

Normal: Non-Class MCC through a Voltage Regulator
Backup: SIAS Load Shed Panel
- Except D16 for Unit 3 which is a Class MCC

4

Are the ABTs Power Seeking or Normal Seeking?

Power Seeking

5

What will be the status of the NN buses if a SIAS + LOP were to occur?

NNN-D11 - Transferred to Class MCC Backup
NNN-D12 - Transferred to Class MCC Backup
NNN-D15 - de-energized
NNN-D16 - U1 and U2 - de-energized
NNN-D16 - U3 - Transferred to Class MCC Backup

6

Which NN buses have ground detectors?

NNN-D11 and NNN-D12

7

What indications are there for a ground on an NN bus?

- A local red light
- A Control Room Alarm

8

What would bring in the Common Control Room trouble alarm for NN?

- A Ground on NNN-D11/12
- Loss of backup power on SIAS