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Catawba Nuclear Station > 125VDC and 240/120VAC Auxiliary Control Power System(EPK/EPF) > Flashcards

125VDC and 240/120VAC Auxiliary Control Power System(EPK/EPF) Flashcards

1
Q

What is the purpose of the 125VDC and 240/120VAC Auxiliary Control Power System(EPK/EPF)?

A

The purpose of the 125VDC and 240/120VAC Auxiliary Control Power System is to supply control power to non-safety related equipment and the Operator Aid Computer.

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2
Q

What is the system designator for the 125VDC Auxiliary Control Power System?

A

EPK

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3
Q

What is the system designator for the 240/120VAC Auxiliary Control Power System?

A

EPF

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4
Q

What are the major system components of the 125VDC Auxiliary Control Power System?

A
  1. Two 125VDC Batteries
  2. Two Normal Battery Chargers
  3. One Standby Battery Charger
  4. Two 125VDC Distribution Centers
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5
Q

What are the designators for the 125VDC Batteries?

A

CBA

CBB

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6
Q

What are the designators for the Normal Battery Chargers?

A

CCA

CCB

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7
Q

What is the designator for the Standby Battery Charger?

A

CCS

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8
Q

What are the designators for the 125VDC Distribution Centers?

A

CDA

CDB

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9
Q

What is the purpose of the 125VDC Battery Chargers?

A

The Battery Chargers provide the normal power to the 125VDC Distribution Centers(CDA and CDB).

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10
Q

Where are the 125VDC Battery Chargers powered from?

A

The Normal Battery Chargers are powered from Blackout Load Centers:

  1. CCA is powered from LXI
  2. CCB is powered from LXH

The Standby Battery Chargers is powered from LXC

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11
Q

What are the local indications and controls on the Battery Chargers?

A
  1. Output Volts
  2. Output Amps
  3. FLOAT and EQUALIZE pushbuttons
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12
Q

What is the precaution associated with aligning a battery charger to a bus with no battery aligned?

A

A battery charger is not aligned to any bus unless a battery is connected. The battery chargers lack sufficient voltage stability to serve as the sole power source to a DC system.

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13
Q

What is the purpose of the 125VDC Batteries?

A
  1. The 125VDC Batteries provide backup power for the CDA and CDB Distribution Panels.
  2. They will automatically assume load on a loss of AC power or a loss of a battery charger.
  3. The batteries are normally maintained on a FLOAT charge.
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14
Q

What is the capacity of the 125VDC Batteries?

A

The Auxiliary Control Power Batteries are capable of carrying their associated loads for at least 2 hours.

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15
Q

Which Battery Charger is aligned for an Equalizing Charge?

A

The Standby Battery charger will be aligned to a battery requiring an Equalizing Charge.

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16
Q

When does “Cell Reversal” occur?

A

80-85% of normal battery voltage

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17
Q

Can “Cell Reversal” be corrected?

A

NO

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18
Q

What affect can “Cell Reversal” have on equipment?

A
  1. Damage to the remaining cells of a battery bank.

2. Damage to equipment being supplied by the battery.

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19
Q

How do we prevent “Cell Reversal”?

A
  1. Minimize drain on the battery
    A. Removed non-vital loads from the DC bus.
    B. Placing AC portions of these systems on alternate power supplies.
    C. Consulting station management for recommended loads to remove from a DC bus.
  2. Remove a battery from service when the battery’s voltage drops below 105VDC.
20
Q

What are the typical loads off of the 125VDC Distribution Panels?

A
  1. 600V Non-Essential Load Center Control Power
  2. CM System Control Power
  3. Exciter Control Power
  4. FWPT Control Power
  5. Mulsifyre System
  6. AFWP Control Power
  7. D/G Control Panels
  8. D/G CO2 Fire Protection
  9. 4160V Blackout Switchgear
  10. 125VDC EMC Disconnect Switch
  11. Control Rod Drive Control Panel
  12. Static Inverters(KXIA and KXIB)
  13. Auctioneering Diode that feeds OAC power
21
Q

Where is control power provided from if power from 125VDC Distribution is lost?

A

CDA normally feeds:

  1. Control Power for LXI(600V Blackout Load Center)
  2. 4160V Blackout Switchgear
  3. CAPT Power

If power is interrupted to any one of these loads, ALL of them will automatically be transferred to a center tap on the 250VDC Battery.

22
Q

What action is required to restore the 125VDC loads back to CDA following a power swap?

A

When normal power is restored loads can be manually transferred back to CDA by pushing the RESET pushbutton on the Control Power Transfer Cabinet in the Blackout Switchgear Room.

23
Q

What type of ground detection instrumentation/controls are located at each 125VDC Distribution Panel?

A
  1. Ground Voltmeter
  2. Ground Indication Lights
  3. Battery Voltage to Ground Volt Meter Selector Switch
  4. Battery Undervoltage Relay
  5. Undervoltage Relay Test Switch(I&E only)
  6. Battery Ground Detector Test Switch(I&E only)
24
Q

Where are ground alarms received?

A
  1. Control Room

2. Operator Aid Computer

25
Q

What are the indications of a ground locally at the 125VDC Distribution Panels?

A
  1. The normally dimly lit lights will be brighter for the grounded leg.
  2. When the Battery Volt To Ground Mode Selector Switch is taken to either the POS or NEG position it will show the magnitude of the ground on the Ground Voltmeter.
26
Q

What alarms will be generated in the Control Room when operating the Battery Volt To Ground Mode Selector Switch?

A

NONE

The switches operated by I&E will produce Control Room alarms

27
Q

What are the major components in the 240/120VAC Auxiliary Control Power System?

A
  1. Three 125VDC -120VAC inverters
  2. Three Automatic Transfer Switches
  3. Three Manual Transfer Switches
  4. Two 600VAC Voltage Regulators
  5. Two 120VAC Distribution Centers
  6. Five Panelboards
28
Q

What are the designators for the Static Inverters?

A
  1. KXIA
  2. KXIB
  3. KUI
29
Q

What is the purpose of the Static Inverters?

A

The Static Inverters provide a highly reliable source of AC power by converting 125VDC to 120VAC to supply the AC portion of the Auxiliary Control Power System.

30
Q

What are the designators for the 120VAC Panelboards supplied by the Static Inverters?

A
  1. Train A - KXPA
  2. Train B - KXPB
  3. KUT(OAC Computer Inverter)
31
Q

When a Static Inverter is taken out of service what supplies power to the 120VAC Panelboards?

A

600VAC is regulated and transformed down to 120VAC as a backup source to KXPA, KXPB, and KUT.

32
Q

What are the local indications at the Static Inverters?

A
  1. AC Volts (upstream of Inverter Output Breaker)
  2. AC Amps (upstream of Inverter Output Breaker)
  3. Frequency (upstream of Inverter Output Breaker)
  4. In Sync Amber Light (lit when the normal and alternate sources are synchronized)
33
Q

What are the power supplies for each Static Inverter?

A
  1. KXIA - CDA
  2. KXIB - CDB
  3. KUI - CDA/CDB through auctioneering diodes
34
Q

What is the purpose of the Automatic Static Transfer Switch?

A
  1. The Automatic Static Transfer Switch automatically swaps to the alternate source on lower inverter output voltage.
  2. Manual swap capability is also provided via pushbuttons on the Automatic Transfer Switch.
35
Q

What are the two positions of the Automatic Static Transfer Switch?

A
  1. Inverter to Load (indicated by amber “Static Sw. in Inverter Position”)
  2. Alt Source to Load (Indicated by red “Static Sw. in Alt. Source Position”)
36
Q

What will happen after an automatic swap of the Automatic Static Transfer Switch if output voltage on the inverter returns to normal?

A
  1. 60 second time delay, then
  2. The Automatic Static Transfer Switch will switch back to the inverter when inverter voltage and frequency are normal(Normal Seeking).
37
Q

What is the purpose of the Manual Bypass Switch?

A

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

38
Q

What are the three positions of the Manual Bypass Switch?

A
  1. Normal Operation
  2. Alternate Source to Load
  3. Inverter to Load
39
Q

What is the affect of having the Manual Bypass Switch in the NORMAL position?

A

The Manual Bypass Switch is aligned to the Auto Static Transfer Switch which is supplied by the inverter.

40
Q

What is the affect of having the Manual Bypass Switch in the Inverter to Load position?

A

Bypasses the Auto Static Transfer Switch and aligns to the inverter directly to the loads.

41
Q

What is the affect of having the Manual Bypass Switch in the Alternate Source to Load position?

A

This position bypasses the Auto Static Transfer Switch and the inverter. The alignment puts the regulated AC power source to the loads.

42
Q

What are some of the indications on the Manual Bypass Switch?

A
  1. AC Volts (downstream of the Manual Bypass Switch)
  2. AC Amps (downstream of the Manual Bypass Switch)
  3. ALT Source Low Voltage - Red Light will be lit when the alternate source voltage is low.
  4. In Sync - Amber Light will be lit when the normal and alternate sources are synchronized.
  5. ALT Source Off Frequency - Light will be lit when the alternate source frequency is not within the proper range of the static inverter.
  6. Alternate Source AC Input Frequency Meter
43
Q

What is the purpose of the Manual Transfer Switch?

A

The Manual Transfer Switch allows for the replacement of the inverter system components online. This switch bypass the inverter, the Auto Static Transfer Switch, and the Manual Bypass Switch.

44
Q

What are the designators for the 120VAC Regulated Panels?

A
  1. KXPA
  2. KXPB
  3. KUT
45
Q

What are the typical loads off of the 120VAC Regulated Panels?

A
  1. Main Control Boards
  2. Main Turbine Control
  3. Radiation Monitor Cabinets
  4. Smoke and Detection Systems
  5. NC Pump Vibration Monitor
  6. H2/KG Panel
  7. Inverter Control Power
46
Q

What is 240/120VAC Regulated Power used for?

A
  1. Provides regulated power to to Panelboards RPA and RPB

2. Provides backup power to the inverter Panelboards, KXPA, KXPB, and P-1.

47
Q

What type of interlock is provided on the 240/120VAC Regulated Power input breakers, and why?

A

A Kirk-Key Interlock is provided between the two panel input breakers and the tie-breaker to allow only 2 out of 3 breakers to be closed at once. This prevents cross tying both sources of 240/120VAC power.

Catawba Nuclear Station (72 decks)

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