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3807 Flashcards

0
Q

Where is the APHB powered from?

A

1-HPU-11B-1M, which is supplied from 600VAC Bus 11BLC.

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1
Q

What is the max fuel burn rate for the APHB?

A

210 gal/hr.

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2
Q

What type of tubes does our current APHB have?

A

Fire Tube.

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3
Q

What are the advantages of the Fire Tube over the Water Tube?

A

Portable.
Requires less space.
Contains a larger volume of water for its size.

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4
Q

What are the disadvantages of the Fire Tube vs the Water Tube Boilers?

A

As steam pressure rises, temperature rises.

A sudden drop in pressure w/o a drop in temperature could result in explosion.

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5
Q

What are the APHB trips?

A 
Loss of fuel oil pressure.
Loss of combustion air.
Loss of atomizing air.
Low water level.
High steam pressure.
Loss of pilot or main flame.
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6
Q

What are the different modes of the APHB?

A

In Service (M/S Switch in Auto).
Standby (M/S Switch in Low Fire Hold).
Wet Layup.
Shutdown (M/S Switch in OFF).

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7
Q

When should you expect to see the APHB in Wet Layup?

A

During the summer months as long as the Auto Air Vent Assembly is installed.

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8
Q

For the APHB Feed Pump what are the three Control Switch positions and their corresponding functions?

A

Auto: Feed Pump runs continuously.
Off: Feed Pump is off.
Hand: Feed Pump runs as needed.

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9
Q

What provides the steam for the preheating in the Receiver Tank?

A

Steam from the APHB.

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10
Q

What are the two ways to blowdown the APHB?

A

Bottom (Prefered): Only performed with the APHB shutdown to ensure the safety of the Chem Techs obtaining the samples.
Surface: Performed when the APHB should not be shut down. However, is significantly less affective in removing debris.

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11
Q

Who should be notified prior to placing the APHB in service?

A

Storeroom
Environmental
Chemistry

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12
Q

What the Drum Pressure range the APHB will maintain when in service?

A

70-110 psig.

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13
Q

What needs to be met before the burner management system will proceed?

A

All of the safety conditions.

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14
Q

What are the first 3 steps of the Automatic Startup Sequence of the APHB?

A

Verifies adequate drum level.
Verifies Oil Proof of Closure Light is lit (Fuel Oil valves are closed).
Fresh Air Louvers open.

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15
Q

What are the second 3 steps of the APHB Automatic Startup Sequence?

A

Checks Water Limits Light lit (adequate drum level, fire suppression system ready, emergency switch pulled out, Fresh Air Louvers open)
Call for Heat if necessary (Water Limit Light lit with pressure less than 70 psig).
Combustion Fan commences purge cycle and the Air Damper goes full open.

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16
Q

What are the third 3 steps of the APHB Automatic Startup Sequence?

A

When the purge cycle is complete (Air Damper repositions to off, Fuel Oil Valve closes, Atomizing Air Compressor starts).
Ignition Transformer energizes.
Pilot Valves Open.

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17
Q

What are the remaining steps of the APHB Automatic Startup Sequence?

A

Fire scanner verifies flame present.
Ignition Transformer de-energizes.
Main Fuel Oil Valves Open.
Pilot Valves Close.

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18
Q

What safety switches will the burner attempt to relight after opening and reclosing?

A

Primary Low Water.
Primary High Pressure.
Modulating High Pressure.

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19
Q

What are the opacity limits of the APHB exhaust?

A

6 minute average of 20% or less. Except for one 6 minute average of 27% or less per hour. Otherwise NO BLACK SMOKE!

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20
Q

What are the new annual checks for the Traveling Water Screens?

A

No large gouges on the friction strips that would indicate material loss. A flat (non-tapered) outside edge of the friction strip. A 1/2” overlap of the mating surface between the friction strip and the screen frame. Less than 1/4” gap between the frame and the friction strip with no gaps between panels.

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21
Q

What are the normal trips on the EDGs?

A

Bearing Temperature High, Incomplete Start, Generator Phase Over current, CO2 Acuation, Fuel Oil Pressure Low, Low Lube Oil Pressure, Air Chest Pressure High, Neutral Over current, Generator Phase Differential, Electronic Overspeed.

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22
Q

What are the trips for the EDGs under emergency conditions?

A

Generator Phase Differential, Electronic Overspeed, Manual CR or Local Emergency Pushbutton.

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23
Q

What are the trips on the EDGs after a loss of DC?

A

Mechanical Overspeed and the Worthington Trip Knob.

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24
Q

Describe the electrical flow path of the Main Generator and Excitation system.

A

Pilot Exciter/Alt Supply, Excitation Transformer, Exciter Field Breakers, Voltage Regulators (Converters), Exciter Collectors and Brush Assemblies, Main Exciter, Generator Field Rectifier Assembly, Generator Collector Ring and Brush Assembies, Main Generator, Generator Stator, Generator Output Bushings, Main & Aux Transformers.

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25
Q

How do you locally trip the Exciter Field Breaker?

A

Obtain the keys to the cabinet on the 609’ Generator Area from the Shift Manager’s Office, and push the trip pushbutton once you’re in the cabinet.

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26
Q

What is the outlet voltage of the Unit 2 Pilot Exciter?

A

~575 VAC

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27
Q

A loss of hydrogen pressure would result in overheating of which component of the Unit 2 Main Generator?

A

Rotor

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28
Q

Main Generator Voltage is controlled by adjusting the…

A

Main Exciter Field

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29
Q

The Main Exciter is cooled by circulating…

A

Air cooled by TACW.

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30
Q

With the Unit 2 Main Turbine on turning gear and generator hydrogen pressure at 60 psig, what should the flow rate through the GCM be? Why?

A

0, because flow is due to the fans on the rotor.

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31
Q

A red lamp on the Unit 2 Field Rectifier panel indicates:

A

A blown rectifier fuse.

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32
Q

The control room has asked you to verify Unit 2 Pilot Exciter voltage is acceptable. Where is the indication located?

A

609’ on the Excitation Control Terminal (ECT) (Start Status is a Green “OK”)

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33
Q

The Control Room has asked you to verify a “Generator Internals Overheated” alarm. You confirm this by verifying the local indication for:

A

Generator Condition monitor current output is les than 50%.

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34
Q

The failure of which ONE component would prevent any operation of the Main Generator?

A

An Exciter slip ring.

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35
Q

What cools the Main Generator Output Bushings and Busses?

A

Stator Water and Hydrogen Gas (indirectly).

36
Q

What is the output voltage of the Unit 2 Main Generator?

A

26kV.

37
Q

How are the ends of the Stator bars connected to their respective cooling manifolds? Why?

A

Via teflon tubes, because they are non-conductive.

38
Q

How is the Rotor of the Main Generator cooled?

A

Hydrogen Cooling System.

39
Q

How is the Hydrogen moved through the Main Generator for cooling?

A

By the fans mounted on both ends of the Rotor of the Main Generator.

40
Q

What is the function of the Main Generator Collector and Brushes?

A

To allow transmission of the excitation current from the Field Rectifiers to the Rotor of the Main Generator.

41
Q

What would the loss of a single Generator Hydrogen Cooler result in?

A

The reduction of Generator output to 1000 Megawatts.

42
Q

What is the power supply for Main Generator alternate Excitation?

A

600 VAC MCC 2-TBG-BE located on 591’.

43
Q

What are the inlet and outlet voltages of the Excitation Transformer?

A

Inlet: ~575 VAC
Outlet: 78 VAC

44
Q

What is the function of the Converters?

A

Convert the 78 VAC to a DC voltage set by the Voltage Regulators.

45
Q

What is the function of the Main Generator Field Rectifiers?

A

To rectify the AC current from the Main Exciter to DC current supplied to the Main Generator Rotor.

46
Q

How many Rectifier Banks are needed to maintain the Generator at 100% power?

A

3 of 4.

47
Q

What would indicate a fault in a Rectifier Bank?

A

A red lamp would be lit in the back of the Rectifier Cabinet.

48
Q

How would you be able to determine which fuse was blown on a Rectifier Cabinet with the Red Lamp lit on it’s back side?

A

By the finding the elevated pin on the front side of the associated Rectifier Cabinet.

49
Q

Why do we use Hydrogen in the Main Generator?

A

The atoms are smaller so there is less windage and thus higher effiency; and hydrogen provides better thermal conductivity than air.

50
Q

What is the normal pressure of Hydrogen in the Main Generator?

A

57-68 psig.

51
Q

What is the normal Hydrogen Purity in the Main Generator?

A

Must be maintained above 90%; normal operating range is 98-100%.

52
Q

What would be the result of a loss of Generator Hydrogen pressure?

A

The Main Generator Rotor would overheat and a load reduction or shutdown would be required.

53
Q

How does TACW support the Unit 2 Main Generator?

A

Supplies the cooling water to Stator Water Coolers, Hydrogen Gas Coolers, Bus Duct Coolers, and Exciter Coolers.

54
Q

What is the function of the Generator Condition Monitor (GCM)?

A

To detect occurrence of any local overheating within the Main Generator and to provide an alarm in the Control Room as well as locally.

55
Q

What are the requirements for placing the GCM in service?

A

Main Turbine is on the Turning Gear, Main Generator filled with Hydrogen, Initial lineup of the GGA and GCM-X valves, Open Hydrogen Isolation Valves

56
Q

What could affect the GCM current besides breakdown of insulation inside the Main Generator?

A

Decreasing/Increasing pressure or decreasing/increasing hydrogen flow will also reduce/increase output current.

57
Q

What’s the normal operating range of the GCM?

A

70-95% conductivity.

58
Q

What’s the function of the Hydrogen Purity Monitor?

A

Monitors hydrogen purity to provide an early warning if purity decreases toward the flammable OR explosive levels.

59
Q

What actions could be taken to mitigate a lowering Hydrogen Purity in the Main Generator?

A

Initiate Hydrogen Bleed and Feed.

60
Q

What’s the purpose of the Leakage Detection System on the Main Generator and Main Exciter?

A

To detect oil and/or water leakage.

61
Q

What is the function of the Hydrogen Seal Oil System?

A

To maintain Hydrogen Gas of the Main Generator inside the casing while maintaining the air outside of the casing.

62
Q

What do we maintain Hydrogen Air-Oil pressure in relation to Generator Hydrogen Gas pressure?

A

Air-Oil is 7 psig greater than Gas pressure.

63
Q

What do we maintain Vacuum-Oil in relation to Air-Oil?

A

Vacuum-Oil is 6 psig greater than Air-Oil.

64
Q

What is Hydrogen-Oil pressure maintained at?

A

Hydrogen-Oil is a slave to Vacuum-Oil so it would match whatever pressure Vacuum-Oil is maintaining.

65
Q

What supplies the Air-Oil Loops?

A

The Main Turbine Lube Oil Tank.

66
Q

What supplies the Vaccum-Oil Loops?

A

The #5 Bearing Oil Drain and the Air-Oil bypass header.

67
Q

What supplies oil to the Hydrogen-Oil Loops?

A

Overflow from the Vacuum-Oil Loops.

68
Q

What auto-starts the standby AC/DC Air-Oil Pumps?

A

Air-Oil Pressure decreases to within 4 psid of Generator Gas pressure; discharge pressure from the running is less than 15 psig.

69
Q

What’s the function of 2-LRV-608 Air-Oil Pressure Regulating Valve?

A

To maintain Air-Oil pressure 7 psig above Machine Gas Pressure and to port the excess oil to the bearing oil drain header.

70
Q

What’s the function of 2-LRV-610 Air-Oil Constant Pressure Valve?

A

Maintains Air-Oil Pressure at 75 psig upon closure of 2-LRV-608.

71
Q

What is the function of the Hydrogen Detrain/Siphon Tank?

A

Collects return oil from the Air/Hydrogen Loops and maintains ~1.5” of vacuum to remove entrained air and hydrogen via the vapor extractor.

72
Q

What is the function of the Mist Eliminators?

A

Prevent oil from entering the lake via storm drains; collected oil drains to the barrel on 609’ by the Seal Oil Filters.

73
Q

What would trip off the Vacuum-Oil Pump?

A

Low level on the Vacuum-Oil Tank after 10 sec time delay.

74
Q

How do the Vacuum-Oil Loops maintain 6 psig above the Air-Oil Loops?

A

2-SV-601/602 are set to maintain 6 psig above Air-Oil and communicate directly with the Air-Oil Loops.

75
Q

What is the function of 2-LRV-609 Vacuum-Oil Tank Make-up Regulator?

A

Throttles according to the demand on the Vacuum-Oil tank to maintain between the upper and lower limits.

76
Q

What’s the function of the Vacuum-Oil Vacuum Pump?

A

Removes air/hydrogen/oil vapor from the Vacuum-Oil Tank; provides method for creating a vacuum in Unit 2’s SCW Tank when establishing a Hydrogen atmosphere; will trip after 10 seconds if Vacuum-Oil Tank level gets too high.

77
Q

What will cause the Hydrogen-Oil Pumps to trip?

A

Low Level condition in the suction leg of the Hydrogen-Oil Loops for 10 seconds or more.

78
Q

What cools the Hydrogen-Oil Loops?

A

The Hydrogen-Oil Coolers that are cooled by NESW in conjunction with the self-contained Temperature Regulating 3-way valves on the outlet side of the Hydrogen-Oil Coolers.

79
Q

What is the function of 2-LRV-606/607 Hydrogen-Oil Pump Discharge Pressure Regulating Valves?

A

Maintain constant level in the suction leg of the Hydrogen-Oil loops; will throttle open to lower pressure on the discharge side of the Hydrogen-Oil Pump to allow for spill-over from the Vacuum-Oil Loops; reverse action on a high level condition.

80
Q

What is the function of 2-LRV-603 Overflow to H2 Detrain/Siphon Tank?

A

Drain excess Hydrogen-Oil to prevent spilling over into the Generator casing.

81
Q

What is the purpose of the TSC UPS System?

A

Provides transient free regulated uninterrupted power supply to: Plant Security System, Plant Process Computer System, Miscellaneous TSC Loads, Control Room Door opener/closer.

82
Q

What’s the design of the TSC UPS Battery?

A

125 vdc; can carry inverter loads for approximately 30 minutes before auto-transfer is necessary.

83
Q

What’s the function of the TSC UPS Battery Chargers?

A

Normal supply to DC bus feeding 125 VDC to the TSC UPS Inverters; receives 600 VAC power from the Selector Cabinet.

84
Q

How does the TSC UPS ABT function?

A

Normal Seeking: transfers to Alternate (MCC 12-DGL) on loss of Normal (600 VAC Bus 11C); Returns to normal automatically when Normal power is restored.

85
Q

What’s the function of the TSC UPS Inverters (Unit 1, Unit 2, Spare)?

A

Converts 125VDC to 120VAC; upon inverter malfunction or loss of DC power automatically transfers to the alternate AC source; spare inverter can be manually aligned to replace either TSC inverter or the Security inverter.

86
Q

What is the function of the CVT associated with the TSC UPS System?

A

Provides regulated 120 VAC to TSC UPS inverters; receives power from 600V bus 11A (Bkr 11A9); supplies power automatically upon inverter malfunction or loss of AC and DC power to the inverter circuitry.

87
Q

What is the function of the AMSAC Inverters (Unit 1 & Unit 2)?

A

Converts 250VDC to 120VAC; powered from the N Train battery; no AC backup Power is provided to this inverter; loss of DC input will cause a loss of 120VAC output.

88
Q

What are the TSC UPS Ventilation System’s automatic actions following a fire?

A

Fire Dampers close on: high temp (Fusible Link), fire detected; inverter room supply fan trips if fire is detected; battery room exhaust fan does NOT trip.

AEO Training Material (4 decks)

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