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4703 > Main Feedwater > Flashcards

Main Feedwater Flashcards

1
Q

What are the MFP trips?

A
  • SI
  • Rx Trip
  • SG High-High Lvl (> 67% (P-14))
  • Thrust Bearing
  • Low Condenser Vacuum (< 20.0/20.3” hg)
  • Low EHC # (2/3 < 800 psig)
  • Low Suction # (< 180# for 5 sec)
  • Overspeed (> 107%)
  • IOPS (> 110%)
  • Low Lube Oil Pressure (< 4# for 5 sec)
  • Manual
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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 < 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)

- HP steam for start-up up to about 55%-60% but available up to 100% power if necessary

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4
Q

What are the FWI isolation actions?

A
  • Closes FRVs (either train RPS)

- Closes FMO’s (train specific 1/4 SGs Trn A and 2/3 SG Trn B)

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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

What are the power supplies for the MFP FMOs?

A
  • 600v AC
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7
Q

What is powered by 600v AC on the Main FW system?

A
  • MFP Discharge
  • MFW FMOs
  • Aux Oil pump
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8
Q

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

A
  • Yes they will
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9
Q

If you get a FWI on either train, will it cause all 4 FRVs to close?

A
  • Yes they close on either a Train A FWI or a Train B FWI. Do not need both to have a FWI signal
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10
Q

What is powered by 250v DC in the MFW system?

A
  • Htr Valves
  • MFP ELOs (Fail Open)
  • DC Oil Pump
  • HP Htr Bypass Valve (FMO-260) (Fails as is)
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11
Q

When will the MFP Seal Water Pump auto start?

A
  • < 15 ΔP between CBP Disch # and MFP suction #
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12
Q

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

A
  • CST (U1)

- HWP Disch (Alt)

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13
Q

How does the MFP Seal Water FRV fail?

A
  • Fails in the closed position but it has a mechanical stop to prevent full closure (5 gpm min) to maintain seal water leak off temp at 150°F
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14
Q

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

A
  • Can handle 10% step change
    OR
  • 5%/min ramp load change w/o steam dump
  • Provides 3.55M lbm/hr (3.7M lbm/hr) of flow to each S/G
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15
Q

When is a MFP forced to Speed Ctrl?

A
  • Both MS Press Xmitters Fail
  • Both MFP Hdr Press Xmitters Fail
  • MFP ΔP Setpoint Xmitter Fails
  • Other MFP Trip when > 60% Power
    (ΔP setpoint > 110 (112.5) ΔP)
  • MFP Speed > 5220 (5300) rpm
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16
Q

What flow do the MFP ELOs modulate to maintain?

A
  • Modulate to maintain 4000 GPM (Suction flow)
17
Q

How will the MFP ELOs respond if the ctrl switch is taken to close with the MFP Stop Valves open?

A
  • ELO’s will go full open if Stop Valves are open
18
Q

How will the MFP discharge valves respond when the MFP stop valves go closed?

A
  • They will go closed if the MFP stop valves go closed. (They will not close on a FWI signal)
19
Q

How much flow can each string of MFW heaters handle?

A
  • 80% flow
20
Q

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

A
  • 20% flow
21
Q

Where does the E MFP ELO discharge to?

A
  • B Condenser
22
Q

Where does the W MFP ELO discharge to?

A
  • A Condenser
23
Q

Which FW heaters on Unit 1 receive HP steam?

A
  • Heaters 5 and 6
24
Q

Which FW heaters on Unit2 receive HP steam?

A
  • Heaters 4, 5, and 6
25
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
26
Q

What do the MFW FRVs have to ensure closure during a FWI?

A
  • Control air lines contain redundant solenoids (Train A and B) to ensure closure during FWI*
27
Q

What provides Seal Steam to the MFPs?

A
  • They are self sealing at high power levels
28
Q

What are the sources of MFP Seal water?

A
  • CBP disch (Norm) ***
  • U1 CST (via MFP Seal water pump) ***
  • HWP Disch
29
Q

How does the seal water to the MFP regulate temp?

A
  • MFP seal water temp regulating valve sense temp on seal water drain and regulates to set point
30
Q

How do the MFP seal water temp reg valves fail on loss of air?

A
  • Open
31
Q

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

A
  • No, the DC Pump bypasses lube oil cooler
32
Q

What is the purpose of the FW CIV Check Valves?

A
  • Prevent complete blowdown of a SG due to a feed line break and ensure AFW flows towards the SGs

4703 (11 decks)

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