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4606 > U1 and U2 Main Feedwater Pumps > Flashcards

U1 and U2 Main Feedwater Pumps Flashcards

1
Q

Explain the design, function, flow paths, and system interconnections of the main feed pumps

A

Flowpath, Condensers, hotwell pumps, SJAE, TACW, Condensate Booster Pumps, Heaters 1-4, Discharge from Heater Drain Pumps, Strainers, Feed Pumps, Heaters 5/6, Steam Generators

Elos Ensure 4000 GPM min flow
East MFP to condenser B
West MFP to condenser A

Main Feed Pumps Condensers go to Condenser B

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2
Q

Modes of Speed Control

A

Speed Control: Set RPM
DP control: set dp to maintain
Auto DP control: Maintains 165 PSID between Bypass header and Feed Pump Discharge Pressure

DP Tech Data Book: as Total Steam Flow Rises Required DP increases as well

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3
Q

Turning Gear Requirements

A

Zero Speed
Oil Pressure
Oil Pump Operating

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4
Q

Seal Water Sources of Water

A
  • Condensate Booster Pump Discharge
  • Seal Water Pump
    • Hotwell Pump Header
    • CST
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5
Q

Seal Water Flow Path and function

A

Receives water and Throttles FRV 259, 260, 261,262 to maintain seal water outlet temperature between 120 and 165. Seal water of higher pressure than feed water is supplied to a tortourous path to prevent feedwater from leaking out and flashing to steam.

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6
Q

Seal Water Pump Auto Start

A

Seal Water Pressure DP is 15 Psid from Feedwater Pressure

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7
Q

Main Feed Pump Expedited Cooldown

A
  • Fail Seal Water Inlet Valves Open
  • Lower Main Feed Pump Oil Temp to 80-90F
  • Isolate Suction and Discharge of the Main Feed Pump
  • Establish drains from the Main Feed Pump
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8
Q

U1 Lube Oil Pumps

A
  • Shaft Driven Pump
    • 138 GPM and 55 PSIG
  • Aux Lube Oil Pump
    • 170 GPM and 180 PSIG
    • Autostart at 43 PSIG
  • DC Emergency Oil Pump
    • 95 GPM and 55 PSIG
    • Supplies oil when turbine on Turning Gear or Loss of AC
    • Autostart at 36 PSIG
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9
Q

Vapor Extractors

A

Maintain a negative pressure to remove moisture and prevent oil leaks form the tank.

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10
Q

Transferring Main Feed Pump lube oil coolers

A

Valve has 3 Positions secured with locknut

  1. Counter Clockwise = 1 cooler in Service
  2. Half way between Clockwise and Counterclockwise= 2 Coolers in Service
  3. Clockwise = 1 cooler in service. Not the same as in number 1

Fill valve opens to allow flow to both coolers until oil vents through to the tank.

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11
Q

Lube Oil Coolers

A

NESW cools them

In the summer WMOS open so you can pinch down on the Reg valves for better throttling capability

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12
Q

Switching U1 Main Feed Pump lube oil filters

A
  • Verify Drain Valves Closed
  • Verify Vent Valves Closed
  • Align Pressure Indicator
  • Slowly position the selector valve to start filling new filter
  • Throttle open vent valve
  • When full close vent valve and fully position selector to new filter
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13
Q

Main Feed Pump Sources Of Steam

A
  1. Main Steam: Bypass Header (Highest Energy Steam)
  2. Reheat Steam: Steam from after the MSR’s (Preferred Source)
  3. Aux Steam: Supplied from which ever header feeding Aux steam
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14
Q

U2 Lube Oil Pumps

A
  • Shaft Driven Pump
    • 227 GPM at 42.5 PSIG
  • Aux Lube Oil Pump
    • 318 GPM at 35 PSIG
    • Autostart on 15 PSIG
  • Emergency Lube Oil Pump
    • 63 GPM at 10 PSIG
    • Autostart on 15 PSIG
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15
Q

U2 Lube Oil Filters

A
  • Disk raises on indication of High DP in filter
  • Swap by:
    • Verify Filter drains closed
    • rotate LO-222 1/4 the way until hard stop
    • filter fills with oil, when free from air
    • back off a bit and press ball handle on inlet valve
    • rotate vale rest of way ensuring flow through sight glass stops
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16
Q

U1 Feed Pump Trips

A
  • Vacuum 20 inches lowering
  • Turbine thrust bearing pposition
  • Overspeed 107% or 110% IOPS
  • Low Turbine Bearing Oil Pressure 4 PSIG
  • Low Suction Pressure ( 5 sec time delay) 180 PSIG and lowering
  • Manual
  • SI Train A or B
  • Steam Generator High High 67%
  • Reactor Trip
17
Q

U2 Main Feed Pump Trips

A
  • Low Vacuum 15 inches and lowering
  • Thrust Bearing Position Trip 32 mills + or -
  • Overspeed 107%
  • Low Bearing Oil Pressure - 13 PSIG for 5 Sec
  • Low suction pressure - 180 PSIG for 5 Sec
  • Manual - Local or Remote
  • SI Train A or B
  • Steam Generator High High 67%
  • Reactor Trip
18
Q

Filling and Venting Main Feed Pump At Power

A
  • Verify aux lube oil pump in service
  • valve lineup to verify mfp isolated
  • verify seal water in serice
  • fill and vent using seal water
  • slowly open main feed pump suction bypass
  • warm per procedure
  • warm to stable by throttling elo isolations

4606 (6 decks)

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