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RO31 ILT > DC Electrical/Instrument Electrical > Flashcards

DC Electrical/Instrument Electrical Flashcards

1
Q

250VDC Battery is sized to ensure how many hours during a LOOP?

A

3 Hrs

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2
Q

250VDC Battery is sized to ensure how many hours during a SBO?

A

4 Hrs

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3
Q

What does T.S. 3.8.4 D state? (D.C. Sources - Operating)

A

If N Train DC electrical power subsystem is inoperable, IMMEDIATELY:
- Declare TDAFW N-train DC inoperable

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4
Q

What does T.S. 3.8.4 E state? (D.C. Sources - Operating)

A

If one or both required Unit 2 Train A and Train B electrical power subsystems inoperable, IMMEDIATELY:
- declare the associated ESW train(s) inoperable

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5
Q

What does T.S. 3.8.5 A state? (D.C. Sources - Shutdown)

A

If required DC electrical power subsystem inoperable, IMMEDIATELY
- Suspend core alterations, suspend fuel movement activities, do not reduce SDM or Boron concentration, initiate action to restore to operable

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6
Q

What does T.S. 3.8.6 F state? (Battery Parameters)

A

If required Actions and associated Completion Time of Condition A, B, C, D, or E not met.
OR
One or more batteries with one or more battery
cells float voltage < 2.07 V and float current > 2 amps.
OR
SR 3.8.6.6 not met,
IMMEDIATELY:
- Declare associated Battery Inoperable

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7
Q

What does T.S. 3.8.8 A state? (Inverters - Shutdown )

A

If one or more required inverters inoperable, IMMEDIATELY:
- Suspend core alterations, suspend fuel movement activities, do not reduce SDM or Boron concentration, initiate action to restore to operable

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8
Q

If one of the two ground detection lights goes out, which one indicates the ground?

A

The one that is not lit indicates ground (Could be dimmer than the other as well)

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9
Q

At what voltages on your 250V DC system will you get alarms?

A

280V DC - High

245V DC - Low

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10
Q

Which 250V DC battery has more capacity than the others and why?

A

U1 CD Battery, because it has additional loads on it (WDS, Drumming Room, MUP, etc)

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11
Q

Where do the BOP battery Chargers get their power from?

A

BMC/CMC

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12
Q

Where do the U1 AB battery Chargers get their normal power from?

A

11A via EZC A - AB Charger 1

11B via EZC B - AB Charger 2

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13
Q

Where do the U1 CD battery Chargers get their normal power from?

A

11D via EZC D - CD Charger 1

11C via EZC C - CD Charger 2

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14
Q

What is the 250V DC BOP Battery sized for?

A

2 hrs for LOOP

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15
Q

What load does not strip off the BOP battery?

A

Emergency Seal Oil pump to prevent H2 from leaking out of generator (explosion hazard)

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16
Q

AB and CD Batteries have enough Amp-hour capacity to supply essential loads during a LOOP, w/o battery terminal voltage falling below?

A

80% capacity at 77˚ F

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17
Q

A 250 VDC station battery is supplying DC bus loads without a battery charger online. If the equipment loaded on the DC bus does NOT change, as the battery is expended the current draw (amps) will?

A

Rise steadily until the design battery capacity is exhausted

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18
Q

CR Lights are powered by ABT(s)?

A

ABT 1 and 2

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19
Q

What are ABT’s 1, 2, 3, & 5 normally powered from for both units?

A

11A South Lighting Transformer

21D North Lighting Transformer

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20
Q

What are ABT’s 1, 2, 3, & 5 back up power supplies for both units are?

A

11C Standby Lighting Transformer

21C Standby Lighting Transformer

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21
Q

AMSAC Invertor makes 120 VAC to the AMSAC Control Bus for?

A

Tripping and actuating relays

22
Q

AMSAC Invertor Makes 24 VDC for?

A

Control Power for the Relays

23
Q

What is the TSC-UPS Battery Charger’s normal power supply?

24
Q

What is the TSC-UPS Charger’s Alt power supply?

25
Q

What is the TSC-UPS inverter’s Backup power supply?

A

11A through an isolimiter

26
Q

What is the amsac inverter’s normal power supply?

A

N-Train via DCN

27
Q

What is Heat Trace’s normal power supply?

A

Vital 600 VAC 11D/21D and 11A/21A

28
Q

If 250 VDC is Inop what else is Inop?

A

ESW Train is Inop (Also affects other Unit)

29
Q

If the CRID Normal Source is OOS, is the CRID Inverter and/or the CRID Bus Inop?

A

CRID Inverter is Inop, but the CRID Bus is Operable

30
Q

If the CRID Bus is powered by CRP-3, is the CRID Bus considered Operable or Inoperable?

A

CRID Bus is Inoperable when it is powered from CRP-3

31
Q

With the unit in Mode 5, which ONE of the following conditions requires entry into a Technical Specifications LCO?

A. Safety busses T11C and T11D de-energized.
B. 600 volt safety busses 11A and 11C cross-tied.
C. Safety bus T11A and T11B de-energized, 600 volt safety busses 11A and 11B De-energized.
D. CRID 1 and 2 inverters powered from their alternate power source with CRID 3 distribution powered from CRP-3.

A

CRID 1 and 2 inverters powered from their alternate power source with CRID 3 distribution powered from CRP-3.

32
Q

What describes the function of the “ALTERNATE SOURCE TO LOAD” pushbutton on a CRID inverter?

A

Electronically transfers the static switch to the alternate source.

33
Q

What does the N’SYNC light on the CRID Inverter mean?

A

The alternate power supply is available

34
Q

What provides power to the CCRP bus ?

35
Q

Is ABT 4 a “Normal Seeking” or a “Power Seeking” ABT?

A

Normal Seeking

36
Q

What is the Backup Power Supply to the CCRP Bus?

37
Q

What are the Normal and alternate Power Supplies to the CCRP Inverter (Unit specific)?

A

U1 MCCD (norm)
U1 EZC-D (Alt)
U2 MDAB (norm)
U2 EZC-A (Alt)

38
Q

What are the normal and alternate Power Supplies to the CRID III Inverter?

A

MCAB 250V DC (Norm)

EZC A via isolimiter (alt)

39
Q

What are the normal and alternate Power Supplies to the CRID IV Inverter?

A

MCAB 250V DC (Norm)

EZC B via isolimiter (Alt)

40
Q

What are the normal and alternate Power Supplies to the CRID I Inverter?

A

MCCD 250V DC (Norm)

EZC C via isolimiter (Alt)

41
Q

What are the normal and alternate Power Supplies to the CRID II Inverter?

A

MCCD 250V DC (Norm)

EZC D via isolimiter (Alt)

42
Q

After the static switch transfer event clears, what will happen with the CRID inverter?

A

After the static switch transfer event clears, and all system parameters are normal for thirty seconds, the static switch automatically re-transfers the load to normal source without interruption

43
Q

The CRID Inverter has already swapped to its alt source once and transfer back to the normal source once. If the inverter was to lose power again and transfer to its alt source, what will happen?

A

The static transfer switch locks out on alt source until it is manually reset

44
Q

In Unit 2, if power was lost to A Train (CD Buses) what will happen with respect to Control Room Power?

A

CRP 3 would no longer have a power source

45
Q

What is the Normal power supply to Rod Position Indication?

46
Q

What is the Normal power supply to the AMSAC Inverter?

47
Q

What is the Normal power supply to the AMSAC Battery Chargers?

A

11/21B

11/21D

48
Q

What is the backup power supply to Rod Position Indication?

49
Q

Norm power supply to TSC-UPS Inverter is?

A

The TSU-UPS Battery Charger via 11C

50
Q

On the CCRP inverter, what does it mean when the NSync lights goes out?

A

Alt source is not available

51
Q

What provides supply power to ABT-4?

A

CCRP Inverter

RO31 ILT (56 decks)

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