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Catawba Nuclear Station > Main Turbine(TB2) > Flashcards

Main Turbine(TB2) Flashcards

1
Q

What is the system designator for Main Turbine Lube Oil Purification System?

A

LT

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2
Q

What is the system designator for Main Turbine Seals?

A

TL

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3
Q

What is the system designator for Main Turbine Feedwater Pump Turbine Seals?

A

TF

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4
Q

What is the system designator for Main Turbine Turning Gear?

A

TG

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5
Q

What is the system designator for Main Turbine Generator Seal Oil?

A

LG

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6
Q

What is the system designator for Main Turbine Hydraulic Oil?

A

LH

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7
Q

What is the purpose of the Main Turbine Lube Oil and Purification System?

A
  1. Supplies lubricating and control oil to the turbine generator bearings, gears, and supervisory components
  2. Provides makeup supply to the LG(Seal Oil) System
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8
Q

What does the Main Turbine Lube Oil supply control oil for?

A
  1. Mechanical Trip Piston - normally supplied to keep the trip latch reset
  2. Reset Trip Piston - during reset only
  3. Overspeed Trip Device - during overspeed testing only
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9
Q

What does the Main Turbine Lube Oil System provide lubrication and cooling to?

A
  1. 12 Journal Bearings
  2. Thrust Bearing components
  3. Turning Gear
  4. Gear to Auxiliary Rotor
  5. Four Couplings between TG shaft and Generator Shaft
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10
Q

What is the design/purpose of the Main Oil Pump(MOP)?

A
  1. Located in the Front Standard of the turbine
  2. Driven at 3600rpm by the turbine shaft through a step-up gear
  3. Suction supplied by the Motor Suction Pump(MSP) on startup and Oil Driven Turbine Booster Pump during normal operation
  4. Normal discharge pressure approximately 260psig
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11
Q

What is the design/purpose of the Oil Driven Turbine Booster Pump?

A
  1. Located in the Main Turbine Lube Oil Tank(MTOT) along with along with the oil turbine which drives it
  2. Supplies the MOP with 15psig to 20psig suction oil
  3. Supplies the suction requirements of the MOP at about 95% turbine speed.
  4. Approximately 220psig operating oil discharging from the MOP passes through booster pump turbine to drive the pump
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12
Q

What is the design/purpose of the Booster Nozzle Baffler and Baffler Bypass Valves?

A
  1. Work together to control oil flow to the Oil Driven Turbine Booster Pump and bearing header oil pressure
  2. Located in the MTOT
  3. Booster Nozzle Baffler Valve controls oil flow to the Turbine Booster Pump to maintain proper suction pressure at the MOP(approximately 35psig)
  4. Booster Bypass Baffler Valve controls bearing header pressure at approximately 30psig by bypassing some oil around the bearing header
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13
Q

What is the design/purpose of the Bearing Relief Valve?

A
  1. Controls bearing header pressure at approximately 30psig working in conjunction with the Booster Bypass Baffler Valve
  2. Maintains approximately 25psig at the shaft centerline
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14
Q

What is the design/purpose of the Turning Gear Oil Pump?

A
  1. Supplies lube oil to the bearing header while on the turning gear and while starting up or shutting down
  2. Up to approximately 70% speed the TGOP provides all bearing lubrication
  3. Greater than 70%, MOP will gradually take over and the TGOP will be operating against a closed check valve
  4. The TGOP is manually shut down when the turbine is at rated speed
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15
Q

When will the Turning Gear Oil Pump automatically start?

A
  1. Operating header pressure drops to 190psig
    OR
  2. Bearing header pressure drops to 15psig
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16
Q

What is the design/purpose of the Motor Suction Pump?

A
  1. Maintains the proper pressure at the suction of the MOP during startup and shutdown
  2. Near rated pressure the Oil Driven Turbine Booster Pump will gradually take over and the MSP will be operating against a closed check valve
  3. Manually stopped after the turbine is at rated speed
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17
Q

What will cause the Motor Suction Pump to start automatically?

A

The MSP will automatically start when the MOP suction pressure drops to less than 10psig

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18
Q

What is the design/purpose of the Emergency Bearing Oil Pump?

A

The EBOP will provide oil to the bearing header in an emergency when all other pumps are lost.

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19
Q

What will cause the Emergency Bearing Oil Pump to start automatically?

A
  1. Operating oil pressure drops to 180psig
    AND
  2. Bearing header pressure drops to 10psig
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20
Q

What is the design/purpose of the Main Turbine Lube Oil Coolers?

A
  1. Two coolers with one normally in service

2. The coolers can be shifted when the unit is in operation via a transfer valve

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21
Q

What is the normal operating band for Main Turbine Lube Oil temperature?

A

110F - 120F

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22
Q

What provides cooling to the Main Turbine Lube Oil Coolers?

A

The Low Pressure Service Water System(RL)

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23
Q

What is the design/purpose of the High Pressure Lift Pumps?

A
  1. There are 8 high pressure positive displacement lift pumps(approximately 2300psig)
  2. Reduce the torque requirements on the turning gear by lifting the shaft off of the bearings
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24
Q

When do the High Pressure Lift Pumps start automatically?

A
  1. The lift pumps start and stop with a permissive signal of 10psig from the TGOP discharge
  2. The lift pump must see a suction pressure of greater than or equal to 6psig to start
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25
Q

What pressure will cause the High Pressure Lift Pump’s light indications to change?

A
  1. Discharge pressure of 325psig extinguishes the green OFF light
  2. Discharge pressure of 900psig turns the red ON light
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26
Q

When are the High Pressure Lift Pumps operated?

A

The High Pressure Lift Pumps are operated whenever the Main Turbine is operating less than 50% of rated speed, and will AUTO start when the TGOP starts.

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27
Q

What is the design/purpose of the Main Turbine Oil Tank?

A
  1. 12,500 gallon tank that stores the oil required for Main Turbine operation
  2. Internal to the MTOT are screens to remove debris from returning oil
28
Q

When do the screens in the Main Turbine Oil Tank require cleaning?

A

When a 2 inch level differential exists across the screens cleaning is required.

29
Q

What is the design/purpose of the Main Turbine Lube Oil Vapor Extractor?

A
  1. Mounted on top of the MTOT

2. Operates continuously to maintain a slight vacuum on the MTOT and remove moisture and gases

30
Q

What is the vacuum on the MTOT maintained at, and how is this accomplished?

A

Vacuum is maintained at 1.5 - 2 inches of water vacuum by throttling the butterfly valve on the Vapor Extractor inlet.

31
Q

What is the purpose of the Turbo-Toc Oil Conditioning System?

A
  1. Removes particulate and water from main turbine lube oil
  2. There are 3 filters, #1 and #3 remove particulate, while filter #2 removes water
  3. Equipped with an oil heater that raises the oil temperature to 100F before entering filter #1
32
Q

What is the design/purpose of the Turbine Oil Transfer Tank?

A
  1. 12,500 gallon capacity, designed to accept the full volume of the MTOT and the CFPT oil tanks
  2. Also used to store oil from a tanker truck until it can be purified
33
Q

What is the power supply for the Motor Suction Pump?

A

1MXA

34
Q

What is the power supply for the Turning Gear Oil Pump?

A

1MXX

35
Q

What is the power supply for the Emergency Bearing Oil Pump?

A

1DPD

36
Q

What is the purpose of the of the Main Turbine and Main Feed Pump Turbine Steam Sealing System?

A
  1. Seals the Main and CFPT Shells against atmosphere

2. Prevents air leakage into the condensers along the turbine shaft and steam leakage at the turbine ends

37
Q

What is the normal pressure band for Main Turbine and Main Feed Pump Turbine sealing steam?

A
  1. Normally sealing steam pressure is 3-6psig
  2. Normal pressure is maintained by a pressure regulating valve(TL-3), and if pressure is too high another valve(TL-9) opens to relieve steam to the condenser
38
Q

What is the purpose of the Labyrinth Seals?

A

The Labyrinth Seals provide a torturous flow path at the turbine casings to keep air out and steam in

39
Q

What is the design/purpose of the Gland Seal Condenser and Packing Exhauster?

A
  1. Gland Seal Condenser condenses the exhaust steam from the turbine packing.
  2. The Packing Exhauster maintains a slight vacuum on the Gland Seal Condenser and removes air and non condensible gases
40
Q

Where does the Steam Packing Exhauster exhaust to?

A

The Unit 1 or Unit 2 Vent

41
Q

What supplies steam for the Main Turbine and Main Feed Pump Turbine Gland Sealing steam?

A
  1. Steam is supplied from Auxiliary Steam during startup
  2. When power is 15% sealing steam may be supplied by Main Steam, but is normally aligned to Auxiliary Steam
  3. When load reaches 50% sealing steam E-Bleed supplies sealing steam
42
Q

What is the purpose of the Turning Gear?

A
  1. Rotates the turbine shaft slowly and continuously during shutdown periods to maintain a straight Turbine Rotor when rotor temperature changes occur
  2. Also jacks the Turbine Rotor for inspection
43
Q

What is the purpose of the Piggyback Motor?

A

The Piggyback Motor starts 2 seconds earlier the Turning Gear to take up the slack

44
Q

How fast does the Turning Gear spin the Main Turbine?

A

3rpm

45
Q

What are the interlocks required to place the Main Turbine on the Turning Gear?

A

All of the following must be met to start the Turning Gear:

  1. Greater than 15psig bearing oil header pressure
  2. Turbine shaft speed less than 1.5rpm
  3. All Generator PCBs open
  4. ENGAGES only if shaft speed is less than 100rpm
46
Q

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

A
  1. Prevent the escape of hydrogen from the enclosed generator casing along the rotor shaft
  2. Reduces hydrogen consumption
47
Q

What is the design/purpose of the Seal Oil Vacuum Storage Tank?

A
  1. Receives makeup oil from Main Turbine Lube Oil
  2. Equipped with a spray header and nozzles to remove air and moisture from the oil
  3. Level in the tank is regulated by a float valve
48
Q

What is the normal Generator Seal Oil Vacuum Tank level?

A
  1. Normal level is at tank centerline
  2. High level is 4 inches greater than normal level
  3. Low level is 8 inches less than normal level
49
Q

What is the design/purpose of the Generator Seal Oil Main Seal Oil Pump?

A
  1. AC motor driven
  2. Positive displacement screw type rotary pump
  3. Utilizes a suction strainer inside the vacuum tank
  4. Rated for approximately 162gpm at 120psig
50
Q

What is the design of the Generator Seal Oil Recirculation Seal Oil Pump?

A
  1. Aids in gas detrainment
  2. Identical pump to the Main Seal Oil Pump
  3. Recirculates oil from the vacuum tank to the spray nozzles
    4 Runs whenever the Main Seal Oil Pump runs
51
Q

What is the design/purpose of the Emergency Seal Oil Pump?

A
  1. DC motor driven
  2. Automatically starts when the Main Seal Oil Pump discharge pressure is less than 110psig
  3. Supplied directly from the Main Turbine Lube Oil return header
52
Q

When does the Emergency Hydrogen Seal Oil Pump automatically start?

A

When the Main Seal Oil Pump discharge pressure is less than 110psig

53
Q

What is the design/purpose of the Generator Seal Oil Vacuum Pump and Separator Tank?

A
  1. Mounted above the Seal Oil Vacuum Tank
  2. Removes moisture and gases
  3. Oil from the separator lubricates the vacuum pump
  4. Moisture is drained to the Turbine Building Sump
  5. Gases are vented to the roof
54
Q

What is the design/purpose of the Seal Oil Differential Pressure Regulating Valve?

A
  1. Maintains seal oil pressure 8psig greater than the hydrogen pressure inside the generator
  2. Differential pressure is sensed:
    A. Hydrogen Detraining Tank
    B. Seal inlet pressure at bearing #9
  3. Has a mechanical stop that allows flow to the seals even if the valve is closed
55
Q

What is the design/purpose of the Generator Seal Oil Relief Valve?

A
  1. Prevents excessive pressure at the discharge of the Main Seal Oil Pump
  2. Usually set at 45psig above generator hydrogen pressure
56
Q

What is the power supply to the Generator Seal Oil Main Seal Oil Pump?

A

1MXW

57
Q

What is the power supply to the Generator Seal Oil Recirculation Seal Oil Pump?

A

1MXX

58
Q

What is the power supply to the Generator Seal Oil Emergency Seal Oil Pump?

A

1DPD

59
Q

What is the design/purpose of the Generator Seal Oil Hydrogen Detraining Tank?

A
  1. Provides a large surface area to facilitate the removal of hydrogen from the oil
  2. Two sections, divided by a partition, to prevent circulation of oil vapor through the seal oil drain lines
60
Q

What is the design/purpose of the Generator Seal Oil Auxiliary Detraining Tank?

A
  1. Removes air from oil drained from the air side
  2. Oil drains through a loop seal to the MTOT to prevent hydrogen from getting to the storage tank
  3. Vented to the Turbine Building Roof
61
Q

What is the purpose of the Main Turbine Hydraulic Oil System?

A

The Main Turbine Hydraulic Oil System supplies hydraulic oil to turbine valve actuators for control and emergency tripping of the turbine by throttling or closing turbine valves.

62
Q

What is the design/purpose of the Main Turbine Hydraulic Oil Reservoir?

A
  1. 800 gallon capacity
  2. Normal level is 0 inches
  3. Temperature is regulated to maintain 100F using fans and heaters
63
Q

What is the design/purpose of the Main Turbine Hydraulic Oil System Hydraulic Pumps?

A
  1. Rated for 53gpm at 1600psig

2. AC motor driven positive displacement pumps with a variable stroke

64
Q

When will the standby Main Turbine Hydraulic Oil Pump start, and when will the Main Turbine trip based on hydraulic pressure?

A
  1. 1300psig the standby hydraulic pump starts

2. 1100psig the Main Turbine will trip

65
Q

What system provides the cooling water for the Main Turbine Hydraulic Oil System Coolers?

A

The Recirculated Cooling Water system(KR)

66
Q

What are the special precautions associated with the Main Turbine Hydraulic Fluid?

A
  1. Known carcinogen
  2. Heavier than water and therefore will not be removed by an oil separator
  3. Must be maintained greater than 95F to prevent damaging filters
  4. Not compatible with petroleum based fluids
  5. Water introduced to the hydraulic system results in increased acidity

Catawba Nuclear Station (72 decks)

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