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Systems Test 5 > LOT 202.13 Feedwater > Flashcards

LOT 202.13 Feedwater Flashcards

1
Q
  • LOT 202.13 Feedwater*
    • *

What supplies steam to the deaerator?

A

Aux Steam
Used During S/U
Switch on CP008

  • *Main Steam**
  • Used < 25% and during load rejection*

Extraction Steam
8th stage of HP turbine (25% - 100%)
Supplied from 2 of 6 crossunder piping

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2
Q
  • LOT 202.13 Feedwater*
    • *

What will auto start the SUFW pump?

A
  • Auto Start:*
  • *Trip of SGFPT**
  • Start Permissives:*
  • *SUFW Lube Oil Pressure > 5 psig**

Suction Pressure > 180 psig

Suction Valve (FW-0517) Open

NPSH Pressure > 80 psid

No Trip Signals

  • *No FW Isolation Signal**
  • P-14 or SI ONLY*

Hand Switches not in Stop/PTL

On Pump Start:

  • Releases discharge non-return valve (DOES NOT OPEN DISCHARGE MOV)
  • Recirc valve starts to modulate (3300 gpm - 7000 gpm)
  • Secures aux seal cooling pumps

Note:
By procedure, a SUFW will have it’s discharge MOV already open

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3
Q
  • LOT 202.13 Feedwater*
    • *

What will auto close the SGFPT recirc valve?

A

SGFP Trip

SGFPT Low Lube Oil Trip

Modulates to maintain 5625 gpm normally

  • Goes full open at 4000 gpm
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4
Q
  • LOT 202.13 Feedwater*
    • *

What is required to reset a FW isolation?

A
  • P-14:*
  • *Reset SI/P-14 (CP006) w/ P-4 False**
  • *Reset FW Cont & Bypass Valves (CP006)**
  • *FW Isolation Switches to “Open” (CP006)**
  • Allows control of PBVs, FWIVs, and FWIBs*

SI:
Reset SI (CP001)
Reset SI/P-14 (CP006) w/ P-4 False
Reset FW Cont & Bypass Valves (CP006)
FW Isolation Switches to “Open” (CP006)
Allows control of PBVs, FWIVs, and FWIBs

  • P-4 w/ Tavg Low (574 ˚F) [2/4]:*
  • *Reset Low Tavg (CP006)**
  • Resets all valves except MFRVs*
  • *FW Isolation Switches to “Open” (CP006)**
  • Allows control of PBVs, FWIVs, and FWIBs*
  • *P-4 must be False to operate MFRVs**
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5
Q
  • LOT 202.13 Feedwater*
    • *

What cools the DA Vent Condenser?

A

Condensate

  • Steam condensed and sent to DA waterbox
  • Non-Condensables sent to CARS discharge header → Unit Vent (Monitored release path)
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6
Q
  • LOT 202.13 Feedwater*
    • *

What provides overpressure protection for the Deaerator?

A
  • *7 Reliefs**
  • Set at 235 psig*

Relieves to atmosphere.

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7
Q
  • LOT 202.13 Feedwater*
    • *

Where does the DA High Level Dumps and the DA belly drains discharge water to?

A
  • High Level Dumps:*
  • *Condenser 13**

DA Belly Drains:
Storage Tank #1: Condenser 11
Storage Tank #2: Condenser 13

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8
Q
  • LOT 202.13 Feedwater*
    • *

What will trip a SUFW pump?

A

SUFW Lube Oil Pressure < 5 psig

  • *FW Isolation**
  • SI OR P-14 ONLY*

NPSH < 80 psid

  • *Undervoltage**
  • 1H Standby Bus*

Phase Differential

Overcurrent

On SUFW Trip:

  • Discharge MOV / Non-Return close (Signal sent for 160 sec)
  • Recirc Valve Closes (Signal sent for 5 sec)
  • Aux cooling pumps start
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9
Q
  • LOT 202.13 Feedwater*
    • *

What causes a Feedwater Isolation Signal?

A
  • P-4 True:*
  • *Tave - Low (574 ˚F) [2/4]**
  • No Permissives:*
  • *SI**
  • *P-14**
  • S/G Level - High (87.5%) [2/4 on 1/4]*

P-4 True: Rx Trip [2/2] AND Bypass Bkrs [2/2] open

  • Note:*
  • Closes FWIVs, bypasses, FRVs, Low FRVs, and PBVs
  • Trips MFP turbines, SUFW, and the Turbine. (SI AND P-14 ONLY)
  • Does NOT trip the FW Booster pumps
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10
Q
  • LOT 202.13 Feedwater*
    • *

How does the Deaerater MS Supply valves (PV-7174 / PV-7174A) behave during a large load rejection?

A

Opens and Pegs DA Pressure to preloss pressure for 6.3 mins

Open Permissives:
NO P-4
NO SI
NO P-14

  • Maintains FWBP NPSH
  • Minimizes flashing
  • Note:*
  • DA Pressure compared to Auctioneered High FWBP Temp (PSat) (Modulates Valves)
  • DA Pressure / Rate compared to crossover piping pressure (Detects loss of load)
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11
Q
  • LOT 202.13 Feedwater*
    • *

What is the motive force for opening/shutting the FWIVs?

A

Hydraulic open / Pneumatic (N2) closed

  • FWIVs fail closed on loss of hydraulics/power.
  • Will NOT close on loss of N2 pressure
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12
Q
  • LOT 202.13 Feedwater*
    • *

Where does the mini flow from the FWBP and MFPs go?

A

DAST #1

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13
Q
  • LOT 202.13 Feedwater*
    • *

What will auto start/trip a FWBP?

A
  • Auto Start:*
  • *Trip of running pump**

Start Permissives:
Lube Oil Pressure > 8 psig
DAST Level > 6%
Oil Pressure ≥ 11 psig
Local switch not in stop

Trip:
Lube Oil Pressure < 8 psig
DAST Level < 6%
UV on switchgear
Overcurrent

Breaker Closing:

  • Opens Discharge MOV (Locks in open signal for 3 min)
  • Recirc valve will modulate (8000 gpm)

Start permissives being met will be indicated by blue light on 13.8 kV switchgear

  • Does not indicate whether MCR switch is in Stop/PTL
    • *

Note:
By procedure a standby FWBP will have it’s discharge MOV already open

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14
Q
  • LOT 202.13 Feedwater*
    • *

What powers the FW Booster pumps / SUFW pump?

A
  • FW Booster Pumps:*
  • *1F / 1G / 1J Aux Bus**
  • SUFW Pump:*
  • *1H Standby Bus**

FW Booster Pumps: (50% capacity) [CP008]

  • < 40%: 1 Running / 1 Stby / 1 PTL
  • > 40%: 2 Running / 1 Stby

SUFW: [CP006]

  • Can provide 20%
    • *

Note:
SGFPTs provide 40% each. (Can operate with 2 SGFPTs and SUFW pump)

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15
Q
  • LOT 202.13 Feedwater*
    • *

What are the open permissives for the FWIVs?

A

SGNR Level > 5%

SG Pressure > 685 psig

  • FWIVs fail closed on loss of hydraulics/power. (Will not close on loss of N2 pressure)
    • Hydraulic open / N2 closed
  • FW Isolation Energizes Train A/B solenoids, which secure the hydraulic pumps and dump hydraulic fluid (Manual switches [2 / SG] located on CP006)
  • Open permissives being met allows de-energizing Train A/B solenoids.

Note:
Same concept for FWIBs and Preheater Bypass Valves (PBVs) except solenoids de-energize to dump hydraulics and energize to allow opening.

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16
Q
  • LOT 202.13 Feedwater*
    • *

What supplies the FWBP shaft seals?

A

Condensate Polisher Outlet

Leakoff collected in Condensate Return Tank → Seal Leakoff tank → Condenser 12.

  • Note:*
  • SGFPT seals also supplied by Condensate polisher outlet
  • Cold return goes to Seal leakoff tank
  • Hot return goes to DA.
17
Q
  • LOT 202.13 Feedwater*
    • *

What are the open permissives for the SGFP discharge MOVs?

A
  • Open Permissive:*
  • *SGFPT Latched**
  • NO AUTO OPEN SIGNALS
  • Valve auto closes on trip of SGFPT
18
Q
  • LOT 202.13 Feedwater*
    • *

What cools the FWBP lube oil cooler?

A

CL-ACW

Also cools the SUFW pump seal water and lube oil.

Note:
FWBP Seal water cooled by condensate polisher outlet.

19
Q
  • LOT 202.13 Feedwater*
    • *

What Deaerator Storage Tank level setpoints will cause automatic /operator actions?

A
  • High 2 (89%/90%):*
  • *DA Inlet MOVs Close (CD-574/CD-575)**

Extraction Steam Block / Non-Return valves Close

FW HTR 11A/B Drain to DA Valves Close

  • 86%:*
  • *High Level Dump Valves Open (FW-7175/7175A)**
  • 30%:*
  • *POP09 requires Rx Trip**
  • 6%:*
  • *FWBPs Trip**

Normal Level is 70%

Note:
Meter on CP008 and ICS will stop indicating at 30%

20
Q
  • LOT 202.13 Feedwater*
    • *

At what power levels are the Low Power FRVs and Main FRVs used?

A
  • Low Power FRVs:*
  • *< 15%**
  • Fail closed on Loss of Air/Power*
  • Main FRVs:*
  • *≥ 15%**
  • Fail closed on Loss of Air ONLY*
  • Controlled from CP006
    • *

Note:
2 safety related solenoids for FW Isolation signal

21
Q
  • LOT 202.13 Feedwater*
    • *

What connects the SUFW Seal Aux Cooling Pump motor to the pump?

A

Magnetic Coupler

Occasionally, the pump will lose magnetic coupling and stop pumping. Stopping and restarting the motor usually restores proper coupling.

22
Q
  • LOT 202.13 Feedwater*
    • *

How is DA level control achieved?

A
  • Manual:*
  • *Used when < 5% Feed Flow**
  • Single Element:*
  • *Used 5% - 20% Feed Flow**
  • *DAST Level ONLY**
  • Average of DST #1/#2 Level compared to LK-7406 setpoint (CP008)*
  • Three Element:*
  • *Used > 20% Feed Flow**
  • *DAST Level**
  • Average of DST #1/#2 Level compared to LK-7406 setpoint (CP008)*
  • *Feed Flow compared to Condensate Flow**
  • Sum of all 4 feed flows*

Controls CD-7406A (Low Flow) [<40%] and CD-7406 (High Flow) [≥ 40%] (Switch at 40% is automatic)

23
Q
  • LOT 202.13 Feedwater*
    • *

What is the functions of the Deaerator / DA Storage Tanks?

A
  • *Reduce O2 and condensable gases**
  • < 2 ppb O2*
  • 5 min retention time in DASTs*

Preheat FW

NPSH for FW Booster Pumps

Systems Test 5 (14 decks)

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