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RO34 - Revised and Upgraded Decks > Main Feedwater > Flashcards

Main Feedwater Flashcards

1
Q

What are the MFP trips?

A
  • Manual
  • Rx trip
  • SI
  • Hi-Hi S/G level (P-14)
  • IOPS (110%)
  • Thrust Bearing position
  • Overspeed (107%)
  • Lo Condenser Vacuum (different per Unit)
  • Lo Lube Oil press (4#) (5 sec TD)
  • Lo Suction press (180#) (5 sec TD)
  • Lo Trip Header Press (800#)
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2
Q

What causes a Feedwater Isolation (FWI)?

A
  • SG High-High level (P-14) (67% NR 2/3 on 1 SG)
  • SI
  • Rx trip (P-4) with low Tavg (Tavg less than 554°F on 2/4 loops)
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3
Q

What supplies the normal steam supply to the MFPs?

A
  • Reheat Steam (Norm)
  • Main Steam for start-up up to about 55%-60% but available up to 100% power if necessary
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4
Q

What happens on a FWI?

A

MFPs Trip
MFP Disch Valves Close
FRVs Close
FMOs Close

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5
Q

What must you do to clear a FWI that is associated with P-4 with Tavg < 554°F)?

A
  • Cycle a Rx Trip Breaker
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6
Q

Will all 4 MFW FRVs close on loss of 250v DC ctrl pwr?

A

Yes

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7
Q

When will the MFP Seal Water Pump auto start?

A

less than 15 psid between CBP Disch pressure and MFP suction pressure

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8
Q

Where can the MFP seal water pump get its suction from?

A
  • Normal: CBP Discharge
  • Alternate: U1 CST
  • Alternate: HWP Disch
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9
Q

What is the FW designed to handle on a load rejection?

A

-10% step change
OR
- 5%/min ramp load change w/o steam dump

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10
Q

When is a MFP forced to Speed Ctrl?

A
  • Both MS Press Xmitters Fail
  • Both MFP Hdr Press Xmitters Fail
  • MFP DP Setpoint Xmitter Fails
  • Other MFP Trip when greater than 60% Power as indicated by MFP DP
  • MFP Speed > 5220 (5300) rpm
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11
Q

What flow do the MFP ELOs modulate to maintain?

A

4000 GPM (Suction flow)

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12
Q

How much flow can each string of MFW heaters handle?

A

80% flow

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13
Q

How much flow can MFW heaters bypass valve (FMO-260) handle?

A

20% flow

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14
Q

Where does the E MFP ELO discharge to?

A

B Condenser

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15
Q

Where does the W MFP ELO discharge to?

A

A Condenser

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16
Q

Which FW heaters on Unit 1 receive HP steam?

A

Heaters 5 and 6

17
Q

Which FW heaters on Unit2 receive HP steam?

A

Heaters 4, 5, and 6

18
Q

Can you manually close the MFP ELOs?

A
  • Yes, you can manually close MFP ELOs but only if the MFP stop valves are closed
19
Q

Does the U-2 DC Lube Oil Pp go thru the Lube Oil Cooler?

A
  • No, the DC Pump bypasses lube oil cooler
20
Q

For a FWI, is the closure of the FRVs Train Specific?

A

No, either train of RPS will get all 4 FRVs

21
Q

For a FWI, is the closure of the FMOs Train Specific?

A

Yes! Interlocked to the Rx Trip Breakers, so if one doesn’t go open, you don’t get that train of FMOs to close

22
Q

What is the purpose of the Air Assist Check Valves in the MFW System?

A

keeps check valve out of flow stream

23
Q

What is the purpose of the MFP Seal Water FRV?

A

Maintains seal water leak off temperature at 150°F

24
Q

What are the MFP Speed Control Inputs?

A

SG Pressure, FP Discharge Pressure and Total Steam Flow

25
Q

How is the Main Feed Pump DP calculated?

A

using the difference between the Lowest FW Pressure and the Highest Steam Pressure (bypass header)

26
Q

If packing is adjusted on a valve, could there be any tech spec implications?

A

Yes, if the valve is required to be timed, the stroke time may not be met

27
Q

While at 100% power onditions, MFP seal water can be normally supplied by _____ discharge and Alternately supplied by ____ discharge.

A

CBP
Seal water pump

28
Q

What is the purpose of low flow feedwater heating?

A

To reduce thermal stress on the feedwater elbows at the SG nozzle area

29
Q

What are the MFP LO Coolers cooled by?

A

NESW

30
Q

Is a FWI Signal a DIRECT signal to automatically trip the MFP?

A

NO!!! It is not a direct signal.

31
Q

What indications/Systems should be checked prior to opening MFP ELOs? Why?

A

Ensure that the FW pump oil system is operating to prevent damage to the FW pumps due to condensate flow spinning the pumps.

32
Q

What is the Low Condenser Vacuum trip for Unit 1 MFP?

A

20” Hg

33
Q

What is the Low Condenser Vacuum Trip for Unit 2 MFP?

A

15”

34
Q

What is the loss of suction pressure trip for the MFPs?

A

Less than or euqal to 180 psig for 5 secs

RO34 - Revised and Upgraded Decks (84 decks)

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