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Systems Test 5 > LOT 202.14 SG Feedwater Pumps > Flashcards

LOT 202.14 SG Feedwater Pumps Flashcards

1
Q
  • LOT 202.14 SG Feedwater Pumps*
    • *

What do the different lights on the turning gear control panel mean?

A
  • White Light:*
  • *Turning Gear speed < 2 RPM**
  • Blue Light:*
  • *Turning Gear speed > 2 RPM**
  • Red Light:*
  • *Turning Gear Running**
  • Green Light:*
  • *Turning Gear Stopped**
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2
Q
  • LOT 202.14 SG Feedwater Pumps*
    • *

When does the SGFPT exhaust lead diaphragm rupture to relieve internal pressure?

A

5 psig

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3
Q
  • LOT 202.14 SG Feedwater Pumps*
    • *

What will auto open / close the SGFPTs drain valves?

A

Auto Open:
SGFPT Trip
Unit Load ↓ 25%
High Drain Pot Level
2 LP Drains ONLY

  • Auto Close:*
  • *Unit Load ↑ 40%**

Note:
Three drain valves / SGFPT.

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4
Q
  • LOT 202.14 SG Feedwater Pumps*
    • *

What are the SGFPT’s Latch Permissives?

A

High / Low Pressure Stop Valves Closed

High / Low Pressure Governor Valves Closed

Manual Speed Control set to 0 RPM

  • *Turbine Speed < 4800 RPM**
  • Unit 2 ONLY*
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5
Q
  • LOT 202.14 SG Feedwater Pumps*
    • *

When does the SGFPTs trip on overspeed?

A
  • Electrical Overspeed:*
  • *5730 RPM (106%)**
  • Mechanical Overspeed:*
  • *5940 RPM (110%)**
    • 109 / - 50 RPM*
  • Normal Speed: 5400 RPM
  • Critical Speed: 2500 RPM
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6
Q
  • LOT 202.14 SG Feedwater Pumps*
    • *

What will auto close the SGFPT Low pressure steam non-return valve?

A

Main Turbine Trip

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7
Q
  • LOT 202.14 SG Feedwater Pumps*
    • *

What will trip the SGFPTs?

A

Bearing Oil Pressure - Low (10 psig)

Lube Oil pressure → Interface valve - Low (35 psig)

Thrust Bearing Wear (± 20 mils) [2/2]

High / Low Presure Stop valves Closed

SI

P-14

  • *Mechanical Overspeed (5940 RPM) [110%]**
  • +109 RPM / -50 RPM*

NPSH - Low (115 psid [3 Sec TC]) [2/2]

Vacuum - Low (14” Hg OR 3 psig)
> 20” Condenser Vacuum (14” Hg)
< 20” Condenser Vacuum (3 psig)

  • *Manual (Electrical/Mechanical Overspeed)**
  • Local (Both) / CP006 (Electrical ONLY)*
  • *Any trip from Woodward 509**
  • Electrical Overspeed (5730 RPM) [106%]*

Note:
Woodward 509 Computer/Printer located on TGB 55’

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8
Q
  • LOT 202.14 SG Feedwater Pumps*
    • *

What cools the SGFPT’s lube oil coolers?

A

OL-ACW

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9
Q
  • LOT 202.14 SG Feedwater Pumps*
    • *

What provides steam to the SGFPTs?

A
  • 2% - 40%:*
  • *MS Equalizing Header**
  • 40% - 100%:*
  • *Reheat Steam from ​MSR 11**
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10
Q
  • LOT 202.14 SG Feedwater Pumps*
    • *

What will auto start the SGFPT’s MOPs?

A
  • Auto Start:*
  • *Running MOP Stopped**
  • *Running MOP’s Discharge Pressure < 50 psig**
  • Normally 75 psig - 85 psig*
  • Start Permissive:*
  • *No Motor Overload**

2 MOPs/SGFPT

Note:
MOP #2 is powered from MCC 1G5. (MOP #1 is non-DG backed)

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11
Q
  • LOT 202.14 SG Feedwater Pumps*
    • *

What are the SGFPT’s speed increase permissives?

A

Turbine Exhaust Valve Open

Suction Valve Open

Suction Pressure > 189 psig

Turning Gear Stopped

Applicable when SGFPT’s speed < 3300 RPM

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12
Q
  • LOT 202.14 SG Feedwater Pumps*
    • *

If the SGFPTs speed is raised above 600 RPM and then speed is then reduced, what speed will trip the SGFPT?

A

450 RPM

Once SGFPT’s speed > 3300 RPM, cannot lower < 3300 RPM

  • Note:*
  • Trip Enabled when SGFPT is raised above 600 RPM OR LP GOV demand Signal > 100%.
  • Trip Blocked when speed < 400 RPM AND SGFPT tripped.
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13
Q
  • LOT 202.14 SG Feedwater Pumps*
    • *

What will auto start the SGFPT’s EOPs?

A

Bearing Oil Pressure < 12 psig

Does not supply interface valve so SGFPT will trip.

1 EOP/SGFPT

Note:
Powered from 250VDC Swbd 1A

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14
Q
  • LOT 202.14 SG Feedwater Pumps*
    • *

What are the SGFPT’s ramp rates?

A
  • 0 RPM - 1500 RPM:*
  • *33 RPM/sec**
  • 1500 RPM - 3300 RPM:*
  • *100 RPM/sec**

3300 RPM - 5600 RPM:
Manual: 33 RPM/sec
SGWL Control: 50 RPM/sec MAX

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15
Q
  • LOT 202.14 SG Feedwater Pumps*
    • *

What will auto start the SGFPT’s Turning Gear?

A
  • Auto Start:*
  • *SGFPT’s Speed < 2 RPM w/ SGFPT Trip**
  • Start Permissives:*
  • *Low / High Pressure Stop Valves Closed**

Lube Oil Pressure > 15 psig

Thermal Overload Reset

Local Switch in “ON”

Note:
SGFPT’s Turning gear powered from MCC 1G5

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16
Q
  • LOT 202.14 SG Feedwater Pumps*
    • *

What speed controllers provide input to the Low / High Pressure governor valves?

A
  • Manual:*
  • *0 RPM - 5700 RPM**
  • SG Level Control:*
  • *3300 RPM - 5600 RPM**

SG Level Control:

  • D/P= FW Pressure - Steam Pressure
    • Reference D/P 0%: 65 psid
    • Reference D/P 100%: 169 psid

Note:
Whichever controller is lower is the one that has control of speed.

17
Q
  • LOT 202.14 SG Feedwater Pumps*
    • *

If the SGFPT’s speed is > 1500 RPM and < 3300 RPM and the raise pushbutton is released, what happens to the SGFPT’s speed?

A

Lowers back to 1500 RPM

Systems Test 5 (14 decks)

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