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AEO Training Material > 3902 (6/3/14 - 6/6/14) > Flashcards

3902 (6/3/14 - 6/6/14) Flashcards

1
Q

What is the purpose of the Unit 1 Main Generator?

A

Converts the mechanical energy of the Main Turbine into electrical energy.

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2
Q

What is the purpose of the Main Generator Excitation System?

A

Generate, transfer and regulate the necessary power for the Main Generator field.

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3
Q

What PPE/Tools are required to operate the Disconnect for the Unit 1 Neutral Grounding Transformer?

A
  • Full Flash
  • Hot Stick
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4
Q

What is the Power Flowpath for the Unit 1 Main Generator & Excitation System?

A
  1. 600 VAC
  2. Step-Down Transformer
  3. Voltage Regulator
  4. Exciter Slip Rings
  5. Exciter Rotor
  6. Exciter Stator
  7. Field Rectifiers
  8. Generator Brushes
  9. Generator Rotor
  10. Generator Stator
  11. Output Bushings
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5
Q

What is the function of the Main Generator Stator?

A

Induces the output voltage from the Main Generator.

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6
Q

What is the function of the Rotor of the Main Generator?

A
  • Supplies the magnetic field and relative motion necessary to induce a voltage in the stator.
  • Fans mounted on each end of the rotor maintain hydrogen flow through the generator for cooling.
  • Ventilation passages are provided in each of the four poles to provide a flowpath for the hydrogen gas that cools the generator.
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7
Q

What is the function of the Collector & Brushes/Slip Ring Assembly of the Main Generator?

A

Allows transmission of the current to the rotor windings.

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8
Q

What is the function of the Output Bushing of the Main Generator?

A

Connects the output of the Main Generator to the Bus Links.

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9
Q

What cools the Main Generator Exciter?

A

Air that is cooled by TACW.

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10
Q

How would the Main Generator System respond to a loss of a single Voltage Regulator?

A

Because the standby Voltage Regulator is maintained at the same voltage as the In-Service Voltage Regulator, there would be a bumpless automatic transfer to the standby Voltage Regulator.

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11
Q

What components of the Main Generator System are cooled by TACW?

A
  1. Exciter Coolers
  2. Bus Duct Coolers
  3. Hydrogen Coolers
  4. Stator Cooling Water Coolers
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12
Q

What is the function of the Main Generator Voltage Regulators?

A
  • Controls the strength of the Magnetic Field of the Main Generator by monitoring the output voltage of the Main Generator.
  • Converts the AC current from the Step Down Transformer to a DC current that goes the Main Exciter.
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13
Q

What is the function of the Main Generator Field Rectifier Assembly?

A

Rectifies the AC current from the Main Exciter to a DC current going the the Collector & Brushes of the Main Generator.

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14
Q

What provides cooling to the Main Generator Field Rectifier Assembly?

A

Stator Cooling Water.

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15
Q

How many Field Rectifier Assemblies are required to operate at full power?

A

5 of 6.

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16
Q

Describe the removal of a Field Rectifier Assembly.

A

FULL FLASH protection must be worn while operating the disconnect switch:

  1. Cabinet and interlock keys obtained from the Shift Mgr
  2. Unlock and open the cabinet door and then unlock the disconnect switch.
  3. Pull the switch down to remove the bank from service.
  4. Interlock key can not be removed with the switch in the open position.
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17
Q

Describe the restoration of a Field Rectifier Assembly.

A
  1. Verify the rectifier cooling water supply and return valves are open.
  2. Close the disconnect switch.
  3. Lock the interlock for the disconnect switch.
  4. Close and lock the cubical door.
  5. Return keys to the Shift Managers office.
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18
Q

What is the function of the Generator Condition Monitor?

A

Detect the occurrence of any local overheating within the Main Generator.

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19
Q

How does the Generator Condition Monitor work?

A
  • Hydrogen flows past a weak source of alpha radiation that produces ion pairs in the hydrogen gas.
  • The ions are attracted to produce a current on a chart on the front of the monitor.
  • Local overheating results in formation of particles that become attracted to the negative ions, reducing their mobility resulting in a lower detector current.
  • When the current falls below a certain value (50%), the alarm contacts on the recorder close and an alarm is received in the Control Room.
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20
Q

Why does the Main Generator have to be at 1800 rpm prior to placing the Generator Condition Monitor in service?

A

To provide the motive force to push the Hydrogen through the GCM.

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21
Q

How does the Hydrogen Purity Monitor work?

A

Compares a known value of thermal conductivity to an obtained value.

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22
Q

What actions do we take when Hydrogen Purity is below 96%?

A

We perform a bleed and feed of Hydrogen to/from the Main Generator.

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23
Q

What is the purpose of the Liquid Leak Detection System?

A
  1. Detect oil and/or water leakage into the Main Generator.
  2. Detect water leakage into the Main Exciter.
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24
Q

What is the purpose of the Unit 1 Stator Cooling Water System?

A

Removes heat from the Main Generator Stator Armature Conductors and Main Exciter rectifiers.

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25
Q

Describe the Normal Flowpath for the Unit 1 Stator Cooling Water System.

A
  1. The two stator cooling water pumps take suction from the stator cooling water storage tank.
  2. Water flows from the pump discharge into the two-pass stator water coolers.
  3. After leaving the coolers, the water passes through a pressure regulating valve, through one of the two filters, and through a double-basket strainer.
  4. The water then flows through the generator.
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26
Q

What is the purpose of the Stator Cooling Water Storage Tank?

A
  1. Provide the necessary height of water above the pump suction to ensure Net Positive Suction Head requirements are met.
  2. Accommodate surges in system volume.
  3. Provide a means of venting H2 that becomes entrained in the system.
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27
Q

What is the normal pressure and flow of the in-service Stator Cooling Water Pump?

A

725 gpm @ 140 psig.

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28
Q

What will auto-start the Standby Stator Cooling Water Pump?

A

In-Service pump discharge pressure @ 120 psig decreasing.

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29
Q

What percent Generator power is one Stator Cooling Water Cooler able to maintain?

A

80%.

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30
Q

What provides cooling to the Stator Cooling Water System?

A

TACW.

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31
Q

What are the make-up sources of water to the Stator Cooling Water System?

A
  • Preferred: Demin Water
  • Backup: Condensate
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32
Q

In relation to Stator Cooling Water temperature, what should Generator Cold Gas Temperaure be maintained at and why?

A

Cold gas temp - should be 3-5 ℃ colder than Stator Water Inlet to prevent condensation from moisture in gas from occurring along outside of Teflon tubes - conductor.

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33
Q

What are the Turbine/Generator Trips associated with the Stator Cooling Water System?

A
  1. Low Pressure (2 of 3 Pressure Switches @ 13 psig lowering)
  2. Low Flow (2 of 3 Flow Switches @ 195 gpm lowering)
  3. High Temperature (2 of 3 Temp Switches @ 95 ℃ for 15 sec)
  4. If conductivity reaches 18 µmhos, then the Main Turbine must be tripped manually.
  • A Generator Trip will occur 30 sec after a Turbine Trip to prevent steam from overspeeding the Main Turbine.
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34
Q

What’s the purpose of the Main Generator Hydrogen System?

A
  1. To remove heat produced by electrical losses in the generator stator and rotor field windings
  2. Safely fill the generator casing with hydrogen.
  3. Continually measure the purity of hydrogen while operating.
  4. Maintain hydrogen pressure in the generator.
  5. Safely remove hydrogen from the generator casing.
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35
Q

What are the advantages of using H2 gas in the Main Generator?

A
  1. Its low density (minimal windage losses.)
  2. It’s high thermal conductivity.
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36
Q

What is the purpose of the Bulk H2 system?

A

The purpose of the bulk hydrogen storage is to store the hydrogen used for system fill and makeup of the Main Generator.

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37
Q

What is the function of the Hydrogen Control Cabinet?

A
  • A control cabinet north of the storage tanks contains the regulators, valves, and associated pressure gauges.
  • Dual pressure regulators reduce the pressure of the gas to approximately 90 PSIG on the supply lines.
  • A relief valve set at 200 PSIG provides protection for the low-pressure header.
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38
Q

What’s the purpose of the Generator H2 Header Isolation Valve (12-GSO-251)?

A
  • Automatically closes @ 50 psig lowering.
  • Protects H2 inventory & minimizes the possibility of an explosive Turbine Building atmosphere in case of a line break.
  • Hold the reset button until pressure builds back to >50 psig to enable reopening.
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39
Q

What’s the purpose of the H2 Supply Manifold?

A
  • 6, 200 SCF H2 bottles @ 2000 psig.
  • Located on 591’ level.
  • Used if bulk supply is not available or if accurate hydrogen usage rates are to be determined.
  • Two pressure regulators in parallel.
  • Relief valve just downstream of the manifold set at 110 psig.
  • Relieves to atmosphere thru a line to the roof.
  • Line to roof is “shared” with other H2 reliefs and vents.
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40
Q

How is pressure maintained in the Main Generator?

A
  • Machine Gas Regulator set for~ 60 psigis normally aligned for service but can be bypassed.
  • Use bypass if regulator has failed.
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41
Q

What is the function of 1-CO-111 (3-way valve)?

A
  • Allows CO2 to be supplied to generator or vented to atmosphere.
  • Normally positioned for CO2 supply.
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42
Q

Why is the H2 distribution tube at top and CO2 at bottom of generator?

A

Less mixing during purges (H2 rise, CO2 is heavy, etc.)

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43
Q

What’s the purpose of the 7.5 ton CO2 Tank?

A
  • Provides sufficient volume to perform Normal/Emergency Main Generator Degas.
  • Normal/Emergency Degas requires 15-20% of Tank Level.
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44
Q

What’s the function of the CO2 Vaporizors?

A
  • Provide CO2 gas supply.
  • Heat liquid CO2 using aux. steam.
  • Design capacity 4000 lb/hr of CO2.
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45
Q

What percentage do we want to maintain Main Generator H2 at?

A

>98%.

46
Q

What is the purpose of the Unit 1 Main Generator Seal Oil System?

A
  • The function of the seal oil system is to provide a seal on the generator shaft to contain the pressurized hydrogen within the generator casing.
  • This minimizes the amount of hydrogen makeup and prevents explosive concentrations of hydrogen from developing around the main generator.
47
Q

What is the pressure of the Main Generator Seal Oil System maintained in relation to Generator Gas pressure?

A

3-8 psig higher than the machine gas pressure.

48
Q

Is the Unit 1 Seal Oil System Normally an Open or Closed Loop system?

A

Open.

49
Q

What are the redundancies built into the Unit 1 Seal Oil System?

A
  1. Main Seal Oil Pump (Normal)
  2. Emergency Seal Oil Pump (Auto starts @ 125 psig of the MSOP)
  3. 120 psig supply from the Main Turbine Shaft Driven L/O Pump (Main Turbine must be > 1300 rpm)
  4. 25 psig supply from the Bearing Oil Header (Can only maintain Seal Oil Pressure @ 8 psig)
50
Q

On what bearings of the Main Generator are the Hydrogen Seals located?

A

Bearings #9 & #10.

51
Q

What is the purpose of the Seal Oil Vacuum Tank?

A

The seal oil tank provides a vacuum atmosphere in which entrained air, water vapor, or any other gases can be removed from the seal oil makeup flow before the oil comes in contact with hydrogen in the generator. The vacuum system eliminates the need for frequent purging and reduces the amount of hydrogen required to make up for system losses.

52
Q

How would the loss of the Recirculation Seal Oil Pump affect the Seal Oil System?

A

Loss of pump will allow purity of seal oil to degrade over time. No longer degassing or removing moisture.

53
Q

What provides cooling to the Unit 1 Seal Oil System?

A

NESW via the Main Turbine Lube Oil Tank.

54
Q

What is the purpose of the Seal Oil Vacuum Pump?

A

The SOVP maintains pressure in the seal oil tank around 1 inch HgA. Absolute pressure less than or equal to 1 inch HgA results in a generator H2 purity of 97% or better.

55
Q

What will cause the Seal Oil Vacuum Pump to automatically trip?

A

High oil level in seal oil tank.

56
Q

What is the purpose of the Recirculating Seal Oil Pump?

A

The RSOP continuously circulates the contents of the seal oil tank. By spraying the oil through the vacuum space, the RSOP helps to completely strip the air from the oil before it is used for generator sealing.

57
Q

What is the purpose of the Emergency Seal Oil Pump?

A
  • Provides a backup supply of seal oil.
  • Automatically starts when the main seal oil pump discharge pressure falls to 125 psig.
  • Relief Valve lifts at the discharge of the pump to maintain 130 psig.
58
Q

What is the purpose of the Seal Oil Regulating Valves (1-LRV-619 & 1-LRV-667)?

A
  • Maintain seal oil supply 3-8 psig above hydrogen pressure.
  • Two valves in parallel, one is normally in service.
  • Alarm actuates at 2.5 psid decreasing pressure.
59
Q

How do the Seal Oil Regulating Valves respond to a failure?

A
  • Gas Sensing Line – Fail Close
  • Seal Oil Sensing Line – Fail Open
  • Diaphragm – Fail Open
  • Spring – Fail Close
60
Q

What is the purpose of the Seal Oil Cuno Filters?

A
  • These full flow cartridge filters, again, filter any particulate material from the oil before flowing to the seal rings.
  • Two in parallel, 1 normally in service.
  • Maximum differential pressure of 9 psid seen on 2 press gages per filter.
61
Q

What is the purpose of the Seal Oil Air Detraining Section?

A
  • Separates the Seal Oil return from the Main Turbine L/O when the MTLO System isn’t in service.
  • The tank is vented to atmosphere with a 6 inch pipe to allow air or hydrogen entrained in the oil to bubble out.
62
Q

What is the purpose of the H2 Drain Seal Enlargement?

A
  • Allows the Oil on the Gas Side of the Generator to drain and release any entrained H2.
  • A vertical partition divides the tank into two compartments which are connected through a loop seal. This prevents the circulation of oil vapor through the seal drain piping because of the differential in the fan pressure between the two ends of the generator.
63
Q

What is the purpose of the H2 Float Trap?

A

The float trap ensures that hydrogen does not blow by into the seal oil system.

64
Q

What are the Systems Responses to a malfunction of the H2Float Trap?

A
  • A stuck open float trap will allow blow-through.
  • A stuck shut float trap will bring in a high level alarm for the Seal Drain Enlargement.
  • Must take manual level control if it is a float problem.
  • Continuously manned while in manual.
65
Q

What would be the result of a Low Oil Level in the Seal Oil Vacuum Pump Resevoir?

A

SOVP may burn up if the oil supply is lost from the separator tank.

66
Q

What are the requirements associated with Containment Integrity?

A

Penetrations into and out of Containment must be closed or capable of being closed in the event of an irradiated fuel accident.

Modes 1-4 this is maintained with the Containment System being Operable.

Mode 6, with fuel movement in progress, this is maintained wth STP 41 (Containment Closure Capability).

67
Q

What conditions must be met to satisfy the Containment Penetrations Tech Spec?

A
  • Hatch is closed and held in place by four bolts.
  • One door of each air lock is capable of being closed
  • Each penetration into/out of Containment is either closed by a manual or automatic isolation valve, blind flange or equivalent, or capable of being closed by an Operable Containment Purge Supply/Exhaust System.
68
Q

What action must be taken if Containment Integrity is compromised during Fuel Movement?

A

If one or more Containment Penetrations is not in required status fuel movement must be suspended immediately.

69
Q

How do we determine if a Containment Penetration meets the requirements for Containment Integrity?

A

Verify the following (in order of preference):

  1. The required flanges are in place.
  2. All valves are Closed, except as noted.
  3. All pipe caps, plugs, locks, or seals are in place.
  4. Penetration is pressurized.
70
Q

How would manipulations be made to vital components during Refueling Integrity?

A
  1. Obtain SRO-CA’s permission prior to.
  2. Obtain a Data Sheet 1.
  3. Perform/verify lineup to ensure Refueling Integrity is being maintained.
  4. Attach new page to the front of the original
  5. Check off option on the original page that was changed and get SRO to sign off.
71
Q

What do the two separate circuits of the Fire Protectoin Tank Level Control do?

A
  • One circuit verifies level and sends a signal to the annunciator panel and level indication on the Sub-panel.
  • The other controls level as necessary.
72
Q

How does the Fire Protection Storage Tank Level Indication on the FPH Subpanel receive its information from the Storage Tanks?

A

There is a Radar sensor that emits short radar pulses of 1 nano second in length that continuously sends a level measurement.

73
Q

What are we going to replaced the Main Feed Pump Shaft-Driven Lube Oil Pumps with?

A
  • Two AC Motor Driven Pumps will replace the Shaft-Driven & the Aux AC L/O Pumps.
  • They will be sized so that only one pump will be in service while the other in standby.
  • An accumulator will be included to maintain pressure during swaps.
74
Q

What will control the new AC Motor Driven L/O Pumps for the Main Feed Pumps?

A

They will be controled from the DSC HMI for the Main Feed Pumps in the Control Room.

75
Q

What are the new NOP & NOT going to be and why the change?

A

2250 PSIA @ 571℉ to reduce wearing on the Steam Generator Tubes.

76
Q

What other changes will have to be made as a result of reverting to the old NOP/NOT in the RCS?

A
  • The CTS Pump start delay time will change from 2 sec to 244 sec.
  • The CEQ fan start delay time will change from 2 inutes to 5.5 minutes.
  • This will allow for a slower blowdown rate during an accident so that we can keep the peak cladding temperature at a minimum despite the new higher Normal Operating Temperaures in the RCS.
77
Q

What is the electrical flowpath when on Backfeed?

A

To the Main Transformer on the high voltage side and out through the low voltage side. The 26Kv is then fed through the bus ducts to the Aux Transformers and stepped down to 4Kv and in to the 4Kv room to feed the PCP bus.

78
Q

What are the possible power sources for 12kV?

A
  1. 69KV (Derby/Bridgman) → TR-7→AB Breaker.
  2. Livingston Road
79
Q

What major loads are fed from the 12kV Power Supply?

A
  1. Training Center
  2. Office Building (New-New Office Building)
  3. Service Building (New Office Building)
  4. Includes Power to the Reverse Osmosis Unit
  5. Containment Access Building (RPAC)
  6. South Security Access / MOF
  7. Fire Pump House
80
Q

What are the possible power sources to the RCP Buses?

A
  1. The Unit Aux Transformer.
  2. The Reserve Aux Transformers.
81
Q

What will cause a UAT to Automatically Trip?

A
  1. Unit and Overall Differential Relays
  2. Overload/Overcurrent
82
Q

What are the Interlocks associated with the UAT’s?

A
  1. UAT must be energized to close.
  2. Must be in Sync to close.
83
Q

What will cause the RAT’s to Automatically Trip?

A
  1. Overload/Overcurrent
  2. Transformer Fault (RAT)
84
Q

What are the Interlocks associated with the RAT’s?

A
  1. RAT must be energized to close.
  2. Must be in Sync to close.
85
Q

What will cause the RAT’s Feeder Breakers to Automatically Close?

A

Unit and Overall Differential Relays (Main Generator Trip, Transformer Fault, etc.)

86
Q

What loads are fed from the RCP Buses?

A
  1. RCP – 6000HP
  2. Circ Pump – 2750 HP
  3. Hotwell Pump
  4. Condensate Booster Pump
  5. BMC/CMC (on 1(2)B and 1(2)C only)
  6. T-Bus
87
Q

How do the RCP Buses respond to an Undervoltage condition?

A
  • If powered from the UAT, at 88% of Nominal voltage, for 99 sec a fast transfer to RAT happens for the associated train.
  • If Degraded voltage continues for 21 Seconds (After Transfer to RAT) the associated RCP Bus Tie Breakers trip.
88
Q

How do the RCP Buses respond to an Undervoltage condition following a Safety Injection?

A

If power supplied to the RCP busses from the RAT, at 88% of Nominal voltage, following a time delay of 2 Minutes (9 seconds with SI or lo SG level) the RCP Bus Tie Breakers Trip.

89
Q

What’s the purpose of the Aux Feed Water System?

A

Provide water to the steam generators during:

  1. Loss of main feedwater.
  2. Unit trip.
  3. Feedwater or steamline break.
  4. Loss of off-site power.
  5. Loss of coolant accident.

The Auxiliary Feedwater System also provides water during start-ups and shutdowns when insufficient steam is available for the main feed pumps.

90
Q

What is the minimum level in the CST required by Tech Specs?

A

182,000 gallons, which is enough to maintain the unit at hot shutdown for nine hours.

91
Q

What are the possible sources of water to the Aux Feed Water System?

A
  1. CST
  2. Opposite Unit’s CST through the cross-tie (CRV-51)
  3. ESW
92
Q

Which AFW Pumps feed which Steam Generators?

A
  • East: 2&3 or Opposite unit’s 1&4
  • West: 1&4 or Oppsite Unit’s 2&3
  • Turbine Driven: 1-4 of Own Unit’s only
93
Q

What powers the AFW Pumps?

A

EDWA:

East:T11D/T21D

West: T11A/T21A

Turbine Driven: Steam from 2&3 SG’s, electricity from N-Train Battery/Charger.

94
Q

What automatically starts the Motor Driven AFW Pumps?

A

BALLS:

  1. Both Main Feed Water Pumps tripped.
  2. AMSAC
  3. Lo-Lo SG Level (1 out of 4 steam generators).
  4. Load Shed (Blackout Sequence!!!!)
  5. Safety Injection
95
Q

What will trip off a Motor Driven AFW Pump?

A
  1. Overload.
  2. Instantaneous overcurrent.
  3. Load shed (from respective bus).
96
Q

What cools the bearings of the AFW Pumps?

A

NESW. Valved in at 140℉ to maintain less than 160℉.

97
Q

What will automatically start the TDAFW Pump?

A

USA:

  1. Under voltage on Reactor Coolant Pump 4kv buses.
  2. Steam generator low-low level 2 out of 4 steam generators.
  3. AMSAC Initiated.
98
Q

What will trip the TDAFW Pump?

A
  1. Electronic overspeed (108%).
  2. Mechanical overspeed (111 %).
  3. Manual (local, HSD panel and Control Room).
99
Q

How do you reset the mechanical overspeed trip on the TDAFW Pump?

A

By pushing the connecting rod toward the outboard turbine bearing (Stabbing the Turbine).

100
Q

What cools the Governor and Oil Cooler of the TDAFW Pump?

A
  • The Shaft driven oil pump supplies oil through cooler to the two turbine bearings.
  • The TDAFP discharge line upstream of ELO supplies cooling water to the Governor and Oil Cooler, and returns to pump suction.
101
Q

What happens upon the receipt of a Flow Conservation Signal?

A

Initiated by signals that automatically start the MDAFP:

  1. Seals in for 45 seconds
  2. Steam Generator blow down isolation valves close
  3. AFW Test valves close
  4. The MDAFP FMO’s open
  5. The Unit 2 TDAFP steam generator supply valves open, the Unit 1 Valves remain in the throttled position.
102
Q

What is Flow Retention and what happens to the AFW System upon receipt of this signal?

A
  • Designed to protect against pump run-out conditions following a Main Steam or Feed Water line break.
  • Pump discharge valves (FMO’s) are throttled closed:
  1. Affected MDAFP receives a signal at flow of 575 GPM.
  2. Affected TDAFP receives a signal at flow of 975 GPM.
103
Q

Where are the FMO’s associated with SG’s 1&4 Located?

A

The East NESW Valve Gallery.

104
Q

Where are the FMOs associated with SGs 2&3 located?

A

That Startup Flash Tank area.

105
Q

What components of the Electrical Distribution System are required to be Operable by Tech Specs?

A

Offsite:

  1. Reserve Feed (via RCP Bus) & EP (Affected Unit)
  2. Reserve Feed OR EP (Opposite Unit)

Onsite:

  1. Two EDGs (Affected Unit)
  2. Which ever EDG needed to support ESW, depending on if the cross ties are open. Could be one, both or neither (Oppostie Unit).
106
Q

How does the Electrical Distribution System respond to a Main Generator Trip?

A

The Main Generator Lockout Relays simultaneously:

  1. Trip feed from the UAT’s.
  2. Close feed from the RAT’s.

The RAT’s:

  1. Automatically adjust voltage to maintain 4kV via the Auto Tap Changer.
107
Q

How does the Electrical Distribution System respond to a Degraded Bus Voltage?

A

If initially aligned to the Unit Aux Transformers (UAT’s):

  • If 88% of rated voltage is sensed on the T11(21)A AND T11(21)D for 99 sec a fast transfer to the Reserve Aux Transformers (RAT’s) is initiated for all four RCP Buses. If Degraded Voltage is still present for 21 seconds following the transfer to the RAT’s the tie breakers from the RCP Buses to the T-Buses trip open.

If initially aligned to the RAT’s:

After 88% of Nominal Voltage is sensed on the T11(21)A AND T11(21)D for 2 minutes (9 sec if an SI or Lo-Lo SG Level signal present) all four T-Buses divorce from the RCP Buses.

Once the T-Buses divorce from the RCP Buses (in either case, whether initially aligned to the UAT’s or the RAT’s):

  1. Load Shed Actuated
  2. EDG Starts – Reenergizes the bus
  3. Loads sequence on
108
Q

What are the automatic functions of the Main Feed Pump Turbine Lube Oil Pumps on lowering Bearing Oil Header Pressure?

A
  • 55# is the normal operating header pressure
  • 43# the S/B AC Oil pump starts
  • 36# Emergency DC Oil pump starts
  • 4# MFP Trips
109
Q

How do the T-Buses respond to a Loss of Voltage condition?

A

If voltage lowers to less than 80% of nominal voltage on the T-Buses for 2 sec on 2 of 3 undervoltage relays:

  1. Load Shed Initiated
  2. The EDG’s start
  3. Once EDG’s are up to rated speed & voltage, the loads sequence on.
110
Q

How does the Electrical Distribution System respond to a Loss of EP voltage?

A
  1. After Undervoltage is sensed on the 69kV EP bus for 150 secs.
  2. An Open signal to the MDS.
  3. After MDS is open, a start signal is sent to the SDGs.
  4. The first SDG to reach speed and voltage closes its breaker onto the dead bus.
  5. The remaining SDG auto synchronizes to the bus and closes its output breaker.
  6. Then the 12-52-SDGS-4 tie breaker is closed to the EP bus.
111
Q

What is the expected AEO response to a Reactor Trip following a Loss of AC Power?

A
  1. Report to the Control Room.
  2. Receive a review of the applicable radiological and safety hazards.
  3. Obtain portable lighting and cutting pliers.
  4. Perform operational checks on accessible equipment which started as a result of the event (Assuming no SI):
  • EDGs
  • AFW pumps
  • CCW Pumps
  • ESW pumps
  • NESW pumps.

AEO Training Material (4 decks)

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