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Preferred AC & DC Flashcards

1
Q

“LCO 3.8.9 - Distribution Systems - Operating” requirements

A

Left and right train AC/DC and Preferred AC Bus electrical power distribution systems operable

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2
Q

“LCO 3.8.10 - Distribution Systems - Shutdown” requirements

A

The necessary portion of AC/DC and Preferred AC Bus electric power systems shall be operable to support equipment required to be operable

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3
Q

What is the required action if in modes 1-4 and 2 or more preferred AC/DC subsystems are inoperable that result in a loss of function?

A

IMMEDIATELY enter LCO 3.0.3

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4
Q

What is the required action if in mode 5 or 6 or during movement of irradiated fuel assemblies and one or more AC/DC or preferred AC Bus electrical power distribution subsystem are inoperable?

A

IMMEDIATELY declare associated supported required feature(s) inoperable

                            OR

IMMEDIATELY

  • Stop Core Alterations
  • Stop irradiated fuel moves
  • Stop positive reactivity additions
  • Restore the required AC/DC or Preferred AC subsystems to operable
  • Declare associated SDC Train inoperable
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5
Q

“LCO 3.8.7 - Inverters - Operating” requirements

A

All 4 inverters operable

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6
Q

“LCO 3.8.8 - Inverters - Shutdown” requirements

A

Inverter for the required train shall be operable

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7
Q

What are the required actions if one or more required inverters are inoperable in mode 5 or 6 or during movement of irradiated fuel assemblies?

A

IMMEDIATELY declare affected required features inoperable

                          -OR-

IMMEDIATELY

  • Stop Core Alterations
  • Stop irradiated fuel moves
  • Stop positive reactivity additions
  • Restore the required inverters to operable
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8
Q

“LCO 3.8.4 - DC Sources - Operating” requirements

A

Left and Right train DC power sources operable

DC power source = 1 battery and directly powered charger

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9
Q

“LCO 3.8.5 - DC Sources - Shutdown” requirements

A

Required DC electric Power Source(s) shall be operable

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10
Q

What are the required actions if one or more DC electrical Power Source(s) is/are inoperable in mode 5 or 6 or during the movement of irradiated fuel assemblies?

A

IMMEDIATELY declare affected required features inoperable

                            -OR-

IMMEDIATELY

  • Stop Core Alterations
  • Stop irradiated fuel moves
  • Stop positive reactivity additions
  • Restore the required DC Power Source(s) to operable
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11
Q

“LCO 3.8.6 - Battery Cell Parameters” requirements

A

Battery Cell parameters for the LEFT/Right train Batteries shall be within limits

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12
Q

What are the required actions if one or more Batteries have one or more Battery Cell Parameters not within Category A or B limits?

A

-Verify Pilot cells electrolyte Level and Float Voltages are within category C limits within 1 hour

                                 AND

-Verify battery cell parameters are within category C limits within 24 hours

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13
Q

How long are the batteries rated for with a loss of offsite power?

A

4 hours

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14
Q

How long are the batteries rated for in the event of a Cable Spreading Room fire?

A

Supply D11A/21A for 72 hours to get to cold shutdown

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15
Q

What are the 4 features that ensure 125 VDC power to the EDG in the event of a fire in Cable Spreading Room?

A

1- Batteries are fused
2- Non Automatic Breaker between battery fuse and bus
3- Distribution panels D11A/21A fused
4- Cabling and Circuits routed to avoid Cable Spreading and opposite trains EDG and switchgear rooms

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16
Q

What are the power supplies to Y-50?

A

MCC-1 normal
MCC-2 emergency
ABT is normal seeking, meaning that it will automatically transfer to MCC-1 once it’s back for 5 minutes

17
Q

What can be supplied by the bypass regulator?

A

1 preferred AC bus at a time (kirk key interlock)

18
Q

Why do Y-30/40 need to be supplied from the bypass regulator when they are being powered up?

A

CRD clutch power supply will overload the inverter.

Once Y-30/40 are powered up, they are placed back on their inverters

19
Q

What is required for the inverters to be considered operable?

A

Must supply its preferred AC bus

20
Q

What is required for Y10/20/30/40 to be considered operable?

A

Considered operable regardless of power source

21
Q

What causes 125 VDC bus undervoltage/trouble alarm?

A
  • DC Bus Tie breaker open
  • PA System under voltage
  • Under voltage on Battery
  • Under voltage on Bus
22
Q

What causes 125 VDC bus ground alarm?

A

3 milliamps ground

23
Q

What causes preferred AC bus trouble alarm?

A

Any local alarm on the inverter panel

If no alarm on the inverter panel, then it is high temp

24
Q

What causes annunciator DC failure alarm?

A

Internal Electronic Drop out

Trip the turbine or RX if the “B” MFP “Trip Power Light” is out

25
Q

What causes battery charger trouble alarm?

A

Any alarm on the local Battery Charger Panel

If no alarm on the local charger panel, then it is either high temp, or aux relay failure

26
Q

What conditions require IMMEDIATELY declaring a battery inoperable?

A

-Required action for cell parameters not within limits and associated completion time not met

                                      OR

-One or more batteries with avg electrolyte temp < 70F

                                      OR

-One or more batteries with one or more cell parameters not within category C limits

27
Q

“LCO 3.8.9 - Distribution Systems - Operating” applicability

A

Modes 1-4

28
Q

“LCO 3.8.10 - Distribution Systems - Shutdown” applicability

A

Modes 5 and 6, or during movement of irradiated fuel assemblies

29
Q

“LCO 3.8.7 - Inverters - Operating” applicability

A

Modes 1-4

30
Q

“LCO 3.8.8 - Inverters - Shutdown” applicability

A

Modes 5 and 6, or during movement of irradiated fuel assemblies

31
Q

“LCO 3.8.4 - DC Sources - Operating” applicability

A

Modes 1-4

32
Q

“LCO 3.8.5 - DC Sources - Shutdown” applicability

A

Modes 5 and 6, or during movement of irradiated fuel assemblies

33
Q

“LCO 3.8.6 - Battery Cell Parameters” applicability

A

All modes when associated DC electrical power source(s) are required to be operable

advanced systems (36 decks)

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