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Review > Systems Test 5 > Flashcards

Systems Test 5 Flashcards

1
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.

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2
Q
  • LOT 202.09 Steam Dumps*
    • *

How does the operator determine the correct setpoint for the Header Pressure Controller (PK-0557) on CP007?

A

Desired Pressure/Span of PI-557*10

1185 psig/1400 psig *10 = 8.46 turns

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3
Q
  • LOT 202.10 Condensate*
    • *

What are the start permissives and trips for the condensate pumps?

A
  • Start Permissives:*
  • *Discharge Valve Closed**
  • No Automatic Actions*

Recirc Valve Closed
Opens and begins modulating on pump start
Shuts when pump secures [5 sec TD]

Suction Valve Open

Adequate NPSH

  • Trips:*
  • *Low NPSH**
  • Low D/P*

NO AUTO STARTS

Note:
Controlled from CP008

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4
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)

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5
Q
  • LOT 202.04 Turbine Lube Oil*
    • *

What will auto start the Bearing Oil Pump?

A

Lube Oil Pressure - Low 2 (11 psig)

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6
Q
  • LOT 202.04 Turbine Lube Oil*
    • *

How does the mechanical overspeed device work?

A
  • *MOP/SOB provides oil pressure to the top of Interface valve (125 psig)**
  • HP Seal Oil B/U Line*

> 111% RPM will reposition plunger and allow LO to drain

Will cause interface valve to open (< 100 psig) and allow EHC to drain

Trips Turbine

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7
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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8
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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9
Q
  • LOT 202.21 Isophase*
    • *

What must be done if both fans on the Isophase are lost?

A

Reduce Power to 50%

Lower Isophase Current to 18,500 Amps
Lower load at 5%/min
Generator Current on CP007

Normal current rating is 36,600 Amps

Note:
Isophase trouble on CP010.

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10
Q
  • LOT 202.10 Condensate*
    • *

What is the minimum flow required through the GSS condenser?

A

5600 gpm

Ensured by FV-7022

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11
Q
  • LOT 202.09 Steam Dumps*
    • *

What causes the #1 and #2 solenoids to de-energize?

A

P-12: Tavg < 563 ˚F [2/4]

Two redundant channels. One for each solenoid.

Can bypass P-12 for Bank #1 Steam Dumps by placing switches on CP007 to Bypass Interlock. (Spring returns to ON)

  • Must take switch to OFF/RESET to secure C/D feature.
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12
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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13
Q
  • LOT 202.06 EHC*
    • *

How does the load drop anticipator work?

A

Actuated When:

Turbine Load > 30% (Reheat Pressure)
AND
Generator Breaker manually opened

Overspeed Protection Controller:

Two OPC Solenoids Energize (Open)

Drains EHC Fluid from Governor / IVs ONLY

Will remain closed for 8 sec

Resets and repeats as necessary until turbine load < 30% (Reheat Pressure)

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14
Q
  • LOT 202.06 EHC*
    • *

What will auto start the standby EHC pump?

A
  • Auto Start:*
  • *Low Pressure (1600 psig)**
  • Permissive:*
  • *EHC Reservoir Tank Level > Extreme Low 2 (7.62”)**
  • Will NOT trip running pump*

Normal: 1900 psig - 2100 psig

  • Relief (2350 psig)

Switches located on CP007.

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15
Q
  • LOT 202.26 Service / Instrument Air*
    • *

What happens as IA pressure lowers?

A
  • 122 psig / 119 psig / 116 psig / 113 psig:*
  • *Compressors 11 - 13 / 14 Start**
  • Lead / Standby / Lag / Air Cooled*
  • 100 psig:*
  • *Service Air Isolation Closes**
  • Reset on ZLP-134 (TGB 29’ by compressors 11/12/13)*
  • 90 psig:*
  • *IA to yard Closes**
  • 88 psig:*
  • *Low Power FRVs drift closed**
  • 80 psig:*
  • *IA Dryer Bypass Opens**
  • Reset by valve*
  • *Letdown Header Orifice header isolation valves drift Closed**
  • 67 psig:*
  • *MFRVs drift Closed**

60 psig:
Manually Trip the Rx
MSIVs drift Closed

Service / IA Air pressure indicated on CP008.

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16
Q
  • LOT 202.10 Condensate*
    • *

What will a high level in FW Heaters 15/16 cause?

A

Closes Inlet/Outlet valve for respective string

Opens Bypass MOV

Trips associated LPHD Pump

Relays for automatic High level actuation comes from LPHD pump control power.

NO AUTO FEATURES FOR FW HTRS 13/14

Note:
Anticipated following a Rx Trip

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17
Q
  • LOT 202.04 Turbine Lube Oil*
    • *

What are the turning gear start permissives?

A

Bearing Oil Lift Pressure > 850 psig

Bearing Oil Header Pressure (PT-6217) > 3.7 psig**

Turning Gear Engaged

Turbine at zero speed

  • Controlled locally and CP007.
  • Turning gear will disengage from shaft at 3 RPM
  • Physically located between LP turbine and generator
*Note:
Turning Gear (CP007) must be in auto/manual and shaft speed \< 600 RPM for pressure to be felt on PT-6217.*
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18
Q
  • LOT 202.19 Generator H2 Gas*
    • *

What are the main generator H2 limits?

A

45 psig - 85 psig

Must trip turbine if limits exceeded.

Note:
H2 / CO2 purity, pressure, and cold gas temp on CP007.

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19
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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20
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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21
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%

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22
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
23
Q
  • LOT 202.04 Turbine Lube Oil*
    • *

What will auto start the Bearing Lift Pump (BLP)?

A

< 600 RPM
AND
Bearing Oil Header Pressure (PT-6217) > 3.7 psig
Pressure at the Turning Gear
AND
Turning Gear Sw (CP007) in AUTO or Manual

  • Supplies Six turbine bearing (3 - 8)
  • Lifts rotor 3 mils
24
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
25
Q
  • LOT 202.06 EHC*
    • *

What happens when turbine speed reaches 103%?

A

Overspeed Protection Controller (OPC):

Two OPC Solenoids Energize (Open)

Drains EHC Fluid from Governor / IVs ONLY

Two OPC solenoids De-Energize (Close) at 1800 RPM (100%)

Governor / IVs Re-Open

Controlled by Aux Governor.

26
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

27
Q
  • LOT 202.09 Steam Dumps*
    • *

What is the steam dump capacity?

A

40%
12 steam dumps (3.33%/Steam Dump)

Controls pressure/temperature following a 50% load reject (10% is covered by rods)

28
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

29
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.
30
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

31
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)

32
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**
33
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)
34
Q
  • LOT 202.08 Extraction Steam / MSRs*
    • *

Where does the extraction steam go on the LP Turbine?

A
  • Turbine End:*
  • *4th Stage: FWH 14A/B**
  • *6th Stage: FWH 15A/B/C**
  • *8th Stage: FWH 16A/B/C**
  • Generator End:*
  • *2nd Stage: FWH 13A/B**
  • *6th Stage: FWH 15A/B/C**

Blowdown flash tank steam goes to FWH 13A/B.

35
Q
  • LOT 202.04 Turbine Lube Oil*
    • *

What will auto start the Emergency oil pump?

A

Lube Oil Pressure - Low 3 (10 psig)

Loss of power to Bearing Oil Pump

Powered from Non-Class 250VDC 1A.

36
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.

37
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
38
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’

39
Q
  • LOT 202.08 Extraction Steam / MSRs*
    • *

Where does the extraction steam go on the HP Turbine?

A

4th Stage Extraction: FWH 11A/11B

Exhaust: DA (FWH 12)

40
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

41
Q
  • LOT 202.09 Steam Dumps*
    • *

What causes the #4 solenoid to energize?

A

Turbine Trip (C-8):

  • *High 1: Tavg - Tref > 13 ˚F**
  • Trips open steam dump banks 1 and 2*
  • *High 2: Tavg - Tref > 26 ˚F**
  • Trips open steam dump banks 3 and 4*

No Deadband

Load Rejection (C-7):

  • *High 1: Tavg - Tref > 7.41 ˚F**
  • Trips open steam dump banks 1 and 2*
  • *High 2: Tavg - Tref > 11.81 ˚F**
  • Trips open steam dump banks 3 and 4*

Setpoint changes based on chart

  • *3 ˚F deadband at 592 ˚F Tavg**
  • Allows Rods a chance to fix deviation*

Active in Tavg MODE only.

  • Note:*
  • Tavg driven off Auctioneered High Tavg
  • Tref driven of PT-505
42
Q
  • LOT 202.10 Condensate*
    • *

What will auto open the GSS Condenser bypass valve (PDV-7020)?

A

GSS Condenser Inlet (MOV-084) closed

GSS Condenser Outlet (MOV-082) closed

Loss of IA / Electrical Power

  • *GSS Condenser D/P > 18 psid**
  • Resets at 5.5 psid*
43
Q
  • LOT 202.17 MG / Exciter*
    • *

What does the different lights on the generator status mean?

A
  • Green:*
  • *Off**
  • Auto Regulator de-energized, Base Adjust on Service*
  • Amber:*
  • *Test**
  • Auto Regulator energized with output to null meter*
  • Red:*
  • *On**
  • Auto Regulator in service*
44
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

45
Q
  • LOT 202.17 MG / Exciter*
    • *

What are the admin limits for MVARs in (+pf) and MVARs out (-pf)?

A
  • MVARS in:*
  • *90 MVARs**
  • Gen Limit is 100 MVARs in*
  • MVARS out:*
  • *450 MVARs**
46
Q
  • LOT 203.09 Condensate Polishing*
    • *

What will auto open the CP bypass valve (MOV-132)?

A

High D/P across demins (105 psig)

Controlled from CP008 (Open/Shut) and locally (Can Jog)

47
Q
  • LOT 202.04 Turbine Lube Oil*
    • *

What will auto start the Seal Oil Backup Pump (SOB)?

A

Lube Oil Pressure - Low (12 psig)

48
Q
  • LOT 202.06 EHC*
    • *

What does the turbine governor look at when the turbine is in “Imp In” and “Imp Out.”

A
  • Imp Out:*
  • *Cumulative Governor Valve Position**
  • Generator MW will change as steam pressure changes*
  • (Non-Linear Response)*

Imp In:
1st stage impulse pressure
GV position adjusted to maintain Impulse pressure (Generator MW) constant
(Linear Response)

Note:
Load control consists of 2 modes. “IMP IN” or IMP OUT”.

49
Q
  • LOT 202.17 MG / Exciter*
    • *

What do the different lights on the ground detection relay mean?

A
  • Amber:*
  • *Test in progress**
  • Red:*
  • *Test Complete**
  • White:*
  • *Ground Detected**

Measures for grounds automatically once every 24 hrs when field CB closed.

Note:
Located on CP007

50
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*
51
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
52
Q
  • LOT 202.09 Steam Dumps*
    • *

What causes the #3 solenoid to energize?

A
  • Tavg Mode:*
  • *C-9**
  • Condenser Vacuum > 22” Hg AND CW breaker Shut [1/4]*

AND

  • *C-7 OR C-8**
  • C-7: 10% load reduction OR 5%/min*
  • C-8: EH pressure 1245.8 psig [2/3] OR TVs closed [2/4]*
  • Pressure Mode:*
  • *C-9**
  • Condenser Vacuum > 22” Hg AND CW breaker Shut [1/4]*

AND
Steam Header Pressure > Setpoint

If C-7 energizes #3 solenoid, must reset on CP007 to de-energize #3 solenoid.

53
Q
  • LOT 202.09 Steam Dumps*
    • *

What does the Imp Selector switch do on CP007?

A
  • Defeat PT-505:*
  • *PT-506 used for C-5 interlock**
  • Defeat PT-506:*
  • *Nothing**

C-5: Turbine Impulse pressure < 15% [1/1]

  • Stops AUTO outward rod motion.
54
Q
  • LOT 202.10 Condensate*
    • *

What will auto close the condensate header min flow valve (FV-7022)?

A

CD Header Pressure < 300 psig

Ensures 5600 gpm flow through GSS Condenser.

Note:
Indicated CD Flow on CP008

Review (8 decks)

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