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Catawba Nuclear Station > 125VDC/120VAC Vital Instrumentation and Control Power System(EPL/EPG) > Flashcards

125VDC/120VAC Vital Instrumentation and Control Power System(EPL/EPG) Flashcards

1
Q

What is the purpose of the 125VDC / 120VAC Vital Instrumentation and Control Power System?

A

The 125VDC and 120VAC Vital Instrumentation and Control Power System provides a source of reliable and continuous power for SAFETY RELATED control and instrumentation required for the following conditions:

  1. Startup, normal operation, and shutdown of each unit.
  2. Blackout or Loss of Offsite Power(LOOP)
  3. Design Basis Event(DBE)
  4. Blackout or LOOP concurrent with DBEs
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2
Q

What is the system designator for the 125VDC Vital Instrumentation and Control Power System?

A

EPL

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3
Q

What is the system designator for the 120VAC Vital Instrumentation and Control Power System?

A

EPG

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4
Q

What are the major system components fo the 125VDC Vital Instrumentation and Control Power System?

A

The 125VDC Vital Instrumentation and Control Power System consists of:
1. Four independent and physically separated channels.
2. Each channel contains:
A. Battery
B. Battery Charger
C. 125VDC Distribution Center
D. 125VDC Panelboard
3. A Spare Battery Charger
4. Distribution Centers EDE/EDF have a backup 125VDC source through auctioneering diodes.

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5
Q

What are the designators for the 125VDC Vital Batteries?

A
  1. Channel 1 - EBA
  2. Channel 2 - EBB
  3. Channel 3 - EBC
  4. Channel 4 - EBD
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6
Q

What Channels of 125VDC Vital I&C Power makeup Train A and Train B?

A
  1. Train A - Channel 1 and 3

2. Train B - Channel 2 and 4

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7
Q

What are the designators for the 125VDC Vital Battery Chargers?

A
  1. Channel 1 - ECA
  2. Channel 2 - ECB
  3. Channel 3 - ECC
  4. Channel 4 - ECD
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8
Q

What are the designators for the 125VDC Vital Distribution Centers?

A
  1. Channel 1 - EDA
  2. Channel 2 - EDB
  3. Channel 3 - EDC
  4. Channel 4 - EDD
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9
Q

What are the designators for the 125VDC Vital Panelboards?

A
  1. Channel 1 - EPA
  2. Channel 2 - EPB
  3. Channel 3 - EPC
  4. Channel 4 - EPD
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10
Q

What is unique about 125VDC Vital Distribution Centers EDE and EDF?

A

To assure a high availability of power and to protect against loss of DC power due to a fire in the Control Complex, the loads that are required for plant shutdown are located on 125VDC buses supplied with two sources of power through auctioneering diodes.

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11
Q

What are the two sources of power to 125VDC Distribution Centers EDE and EDF?

A

EDE:

  1. EDA
  2. 125VDC Diesel Control Panel A

EDF:

  1. EDD
  2. 125VDC Diesel Control Panel B
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12
Q

What are the major components of the 120VAC Vital Instrumentation and Control Power System?

A

The 120VAC Vital Instrumentation and Control Power System consists of:

  1. Four independent and physically separated 120VAC Panelboards.
  2. Four independent 125VDC - 120VAC Static Inverters
  3. Four Manual Bypass Switches
  4. Two Swing Static Inverters
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13
Q

What are the designators for the 120VAC Static Inverters?

A
  1. Channel A - EIA
  2. Channel B - EIB
  3. Channel C - EIC
  4. Channel D - EID
  5. Channel A or C - EIE
  6. Channel B or D - EIF
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14
Q

What are the designators for the 120VAC Manual Bypass Switches?

A
  1. Channel A - EMA
  2. Channel B - EMB
  3. Channel C - EMC
  4. Channel D - EMD
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15
Q

What are the designators for the 120VAC Panelboards?

A
  1. Channel A - ERPA
  2. Channel B - ERPB
  3. Channel C - ERPC
  4. Channel D - ERPD
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16
Q

What is the purpose of the 125VDC Vital Battery Chargers?

A
  1. Serve as the normal power supply to the bus.
  2. Rectify 600VAC to 125VDC
  3. Can carry its own load plus the DC & AC Panelboards of a train related channel.
  4. Can charge the associated battery within 8 hours following a 1 hour discharge while supplying it normal loads.
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17
Q

Why shouldn’t a charger be connected to a bus without a battery being connected?

A

The chargers lack sufficient voltage stability to serve as the sole power source to a DC system.

18
Q

How does the 125VDC Battery Charger operate in ‘Float”?

A

When the “FLOAT” pushbutton is depressed the battery charger operates to maintain battery terminal voltage greater than or equal to 125VDC.

19
Q

What affect on the 125VDC Vital Battery Charger does a High-Voltage Shunt Trip?

A

A High-Voltage Shunt Trip will trip the AC input breaker for a malfunction that causes a high voltage condition at the charger output.

20
Q

What is the plant response to a 125VDC Vital Battery Charger failure?

A
  1. The plant is not affected by a charger failure because the battery will provide backup power to the loads.
  2. Control Room alarm will be received.
21
Q

What is the purpose of the 125VDC Vital Batteries?

A
  1. The batteries serve as a backup power supply for the buses.
  2. The batteries are normally maintained on “FLOAT”
  3. When a battery is removed from service the tie-breakers to the train related bus must be closed.
22
Q

What is the capacity of the 125VDC Vital Batteries?

A

Each battery is sized to carry Its own vital bus loads and the loads of another battery in an emergency for a 2 hour period.

23
Q

When does “Cell Reversal” occur?

A

80-85% of normal battery voltage

24
Q

Can “Cell Reversal” be corrected?

A

NO

25
Q

What is the potential damage of “Cell Reversal”?

A
  1. Damage to remaining cells of the battery bank

2. Damage to equipment being supplied by the battery

26
Q

What do we do to prevent the possibility of “Cell Reversal”?

A
  1. Minimize drain on the battery:
    A. Removing non-vital loads from the DC bus
    B. Placing AC portions of these systems on alternate power sources
    C. Consulting station management for recommended loads to remove from a DC bus
  2. Removing a battery from service when the battery’s voltage drops below 105VDC
27
Q

What indicators/controls are located on the Ground Detection Panels?

A
  1. Ground Indication Lights
  2. Battery Voltage to Ground Meter
  3. Battery Voltage to Ground Volt Meter Selector Switch
  4. Battery Under Voltage Relay
  5. Undervoltage Relay Test Switch
  6. Battery Ground Detector Test Switch
28
Q

What is the local indication of a ground on the Ground Detection Panel?

A
  1. The Ground Indication lights are normally dimly lit. If a ground is in the the grounded leg’s light will be brighter.
  2. When the Battery Voltage to Ground Volt Meter Mode Selector Switch is taken to the grounded leg’s position it will show the magnitude of the ground on the volt meter.
29
Q

Who operates the two test switches on the Ground Detection Panel, and what is the normal position for both?

A
  1. I & E personnel operate the test switches, not Operations.They will bring in a Control Room alarm
  2. The normal position of both switches is NORM
30
Q

What is the purpose of the Auctioneering Diodes for the 125VDC Vital I&C System?

A
  1. Supply EDE and EDF with power from the source with the highest voltage.
  2. Ensures that EDE and EDF have a high availability of power and protect against a loss of DC power due to fire in the Control Complex.
31
Q

What type of interlock is on the 125VDC Vital Standby Charger?

A

There is a Kirk-Key interlock between:

  1. The supply breakers to the standby charger so only one can be closed at a time to prevent tying together two vital AC trains
  2. The standby charger output breakers so only one can be closed at a time to prevent tying together two vital DC trains.
32
Q

What is the purpose of the 125VDC - 120VAC Vital Static Inverters?

A
  1. Invert 125VDC to 120VAC for supply to the AC portion of the Vital Instrumentation and Control Power System.
  2. Supply 120VAC Vital Power to 120VAC Vital Panelboards through a Manual Bypass Switch.
33
Q

What is the purpose of the 120VAC Vital Static Inverter Synchronizing Circuit?

A
  1. Compares the frequency and phase of inverter output to the alternate supply for the distribution panel if the sync disconnect switch is closed and the alternate AC breaker is closed for the distribution panel.
  2. Causes the inverter to turn in sync with the alternate source thereby allowing the 120VAC Panelboard power supply to be swapped without interruption.
34
Q

How can you tell if the Normal and Alternate 120VAC sources for a vital panelboard are synchronized?

A

The “In Sync” light will be lit

35
Q

What is the precaution associated with restarting a Static Inverter?

A

A 60 second wait is required to all the capacitors and rectifiers to cool down.

36
Q

What is the precaution associated with pre-charging a Static Inverter?

A
  1. Static Inverters must be “pre-charged” prior to closing the DC input breaker.
  2. Once the “Pre-Charge” button is released, the “Battery Input” breaker must be closed immediately to prevent blowing the inverter input fuses.
37
Q

What is the purpose of the Swing Inverters?

A
  1. Enhance system reliability and availability by providing an alternated source of 120VAC Vital Power.
  2. Allow for the removal of the normal inverters from service without having to enter a Tech Spec action statement.
38
Q

What is the purpose of the Static Inverter Manual Bypass Switch?

A

The Manual Bypass Switch provides a means of bypassing the Static Inverter.

39
Q

What are the positions of the Manual Bypass Switch, and what do they accomplish?

A
  1. Inverter to Load - Loads are on the static inverter

2. Alternate Source to Load - Bypasses the inverter

40
Q

What part of the 120VAC Vital System is not safety related?

A

The 600V AC power supplied to the regulated portion of the 120VAC Vital System.

Catawba Nuclear Station (72 decks)

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