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Systems > Main Turbine Control and Supervisory Alarms > Flashcards

Main Turbine Control and Supervisory Alarms Flashcards

1
Q

EK-0101, “TURBINE TRIP”

A

EK-0101, “TURBINE TRIP”

Sensor:

  • 63/AST-1, Auto Stop Trip Pressure Switch 74/AST,

Trip Setpoints:

  • 45 psi Auto Stop Oil Pressure and Oil Dump Solenoid operated

Alternate Indication:

  • Main Stop, Governor, Reheat Stop, and Combined Intercept Valves CLOSED

Reactor Trip if greater than 15% Reactor Power.
Main Stop, Governor, Reheat Stop, and Combined Intercept Valves close.
Cooling Tower Fans trip.
Atmospheric Dump Valves and/or Turbine Bypass Valve open per program.
Feedwater flow controllers FIC-0701 and FIC-0703 transfer to MANUAL, and Feedwater Pump(s) ramp down to 5% flow.

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2
Q

EK-0102, “TURBINE OVERSPEED TRIP”

A

EK-0102, “TURBINE OVERSPEED TRIP”

Sensor:

  • OS 63/AST-1, Auto Stop Trip Pressure Switch

Trip Setpoints:

  • 1940 to 2020 RPD, and 45 psi Auto Stop Oil Pressure

Alternate Indication:

  • Main Stop, Governor, Reheat Stop, and Combined Intercept Valves CLOSED

The alarm is actuated by 63/AST-1, automatic functions are initiated by a two out of three logic actuation between 63/AST-1, 63/AST-2, and 63/AST-3.

  • Reactor Trip if greater than 15% Reactor Power.
  • Main Stop, Governor, Reheat Stop, and Combined Intercept Valves close.
  • Cooling Tower Fans trip.
  • Atmospheric Dump Valves and/or Turbine Bypass Valve open per program.
  • Feedwater flow controllers FIC-0701 and FIC-0703 transfer to MANUAL, and Feedwater Pump(s) ramp down to 5% flow.
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3
Q

EK-0103, “TURBINE ROTOR ECCENTRICITY”

A

EK-0103, “TURBINE ROTOR ECCENTRICITY”

Sensor:

  • VIA-0525, Rotor Eccentricity Monitor

Trip Setpoints:

  • 9 mil eccentricity

Alternate Indication:

  • None

OBSERVE trend on TUR-0520 (PT37), Turbine Vibration Eccentricity and Expansion Recorder.
 Leave Turbine on Turning Gear until eccentricity less than 9 mil.

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4
Q

EK-0104, “TURBINE DIFF EXPANSION ROTOR LONG/SHORT”

A

EK-0104, “TURBINE DIFF EXPANSION ROTOR LONG/SHORT”

Sensor:

  • POIA-0527, Differential Expansion Monitor (Generator End),

or

  • POIA-0528, Differential Expansion Monitor (Governor End)

Trip Setpoints:

  • GENERATOR END:
    • Rotor Long, 330 mils
    • Rotor Short, 700 mils
  • GOVERNOR END:
    • Rotor Long, 200 mils
    • Rotor Short, 700 mils

Alternate Indication:

None

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5
Q

EK-0105, “TURBINE HI VIBRATION”

A

EK-0105, “TURBINE HI VIBRATION”

Sensor:

  • TUR-0520, Turbine /Generator/MSR Condition Monitor

Trip Setpoints:

  • 7 mils

Alternate Indication:

  • Turbine Supervisory Instrument Panel

Vibration alarms on TUR-0520 actuate on absolute value (combination of relative and seismic). EC-23A relative (REL) valves use proximity probes which may indicate lower than absolute.

CAUTION
If Turbine vibration due to water induction, then do not trip Turbine until 14 mils vibration is exceeded. Damage can occur due to rubs as the Turbine coasts down through its critical speeds. Damage can also occur due to stator warping after coming to rest due to differential cooling of the Turbine Casing.

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6
Q

EK-0106, “EXHAUST HOOD HI TEMP 217º F”

A

EK-0106, “EXHAUST HOOD HI TEMP 217º F”

Sensor:

  • TS-0536, Exhaust Hood Spray to LP Turbine Temp
  • TS-0544, Low Pressure Turbine B High Temp Switch

Trip Setpoints:

  • 217F

Alternate Indication:

  • TI-0594, #1 LP Exhaust Hood (Turbine)
  • TI-0595, #2 LP Exhaust Hood (Turbine)

If Main Generator is online, then raising load should lower Exhaust Hood temperature.

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7
Q

EK-0107, “TURBINE NO LOAD PRETRIP”

A

EK-0107, “TURBINE NO LOAD PRETRIP”

Sensor:

  • 452-X, Auxiliary Relay-Interlock Generator ACB
  • 63D-X/AM, Turbine Prot Differential Pressure Switch

Trip Setpoints:

  • With Generator Breakers 25H9 or 25F7 and MOD 26H5 CLOSED, 8 psid lowering across High Pressure Turbine first stage.

Alternate Indication:

  • None

Turbine will trip if condition persists for 60 seconds.

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8
Q

EK-0108, “BEARING OIL PRESS PRETRIP”

A

EK-0108, “BEARING OIL PRESS PRETRIP”

Sensor:

  • 63/LBO, Main Turbine K-1 Bearing Oil Low

Trip Setpoints:

  • 8 psig lowering

Alternate Indication:

  • Turning Gear Oil Pump

P-26, Turning Gear Oil Pump, auto start at 9 psig.
P-27, Turbine Gen K-1 Emergency Bearing Oil Pp, auto start at 6 psig.
Turbine Trip at 5 to 7 psig.

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9
Q

EK-0109, “THRUST BEARING PRETRIP”

A

EK-0109, “THRUST BEARING PRETRIP”

Sensor:

  • POIAX-0525, Turbine Thrust Position Monitor Aux Relay

Trip Setpoints:

  • 35 mils Turbine Shaft axial movement in either direction

Alternate Indication:

  • None

(Turbine will trip at 40 mils in either direction)
REDUCE Turbine load at maximum permissible rate per GOP-8.

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10
Q

EK-0110, “VACUUM PRETRIP”

A

EK-0110, “VACUUM PRETRIP”

Sensor:

  • 63/LV, Main Turbine K-1 Low Vacuum Pretrip

Trip Setpoints:

  • 21.5 inches Hg decreasing

Alternate Indication:

  • Turbine Backpressure

Turbine will trip at 18 inches Hg to 21 inches Hg

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11
Q

EK-0111, “VACUUM LO”

A

EK-0111, “VACUUM LO”

Sensor:

  • PS-0761, Condenser Low Vacuum

Trip Setpoints:

  • 24 inches Hg

Alternate Indication:

  • Turbine Backpressure

Turbine will trip at 18 inches Hg to 21 inches Hg.
PT_0763 (PPC) alarms at 6 inches Hg Turbine Backpressure

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12
Q

EK-0113, “EH SYSTEM LO-LO LEVEL TRIP”

A

EK-0113, “EH SYSTEM LO-LO LEVEL TRIP”

Sensor:

  • 386/LFT, Turbine Prot-Lockout EH Sys on Lo Oil Lv

Trip Setpoints:

  • 7-5/8 inches from bottom of EH Reservoir

Alternate Indication:

  • Local EHC level

EH Pump selected for AUTO START:

  • Will lock out if not running.
  • Will not trip if running.
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13
Q

EK-0114, “EH FLUID HI-LO LEVEL”

A

EK-0114, “EH FLUID HI-LO LEVEL”

Sensor:

  • 71/FL-1, EHC Reservoir Hi/Lo Level Alarm

Trip Setpoints:

  • High: 21 5/8 inches from bottom of reservoir.
  • Low: 11 5/8 inches from bottom of reservoir.

Alternate Indication:

  • Local EHC level
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14
Q

EK-0115, “EH SYSTEM HI TEMP/PRESS”

A

EK-0115, “EH SYSTEM HI TEMP/PRESS”

Sensor:

  • 63/HP, EH Fluid Pressure High Pressure Switch
  • 26/HFT, EHC High Fluid Temperature Switch

Trip Setpoints:

  • 2200 psig
  • 135F

Alternate Indication:

  • Local EHC temperature
  • Local EHC fluid pressure
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15
Q

EK-0117, “TURBINE-GEN BEARING HI TEMP”

A

EK-0117, “TURBINE-GEN BEARING HI TEMP”
Sensor:

  • TUR-0520/TSI

Trip Setpoints:

  • 210F

Alternate Indication:

  • Local bearing temperature indicators

IF one or more bearing temperatures exceed 225F, THEN REMOVE unit from service per GOP-8.

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16
Q

EK-0118, “TURB-GEN LUBE OIL HI TEMP”

A

EK-0118, “TURB-GEN LUBE OIL HI TEMP”

Sensor: TUR-0521 ALM 01

Trip Setpoints: 50C

Alternate Indication:
TI-1401, Lube Oil Cooler Outlet Local Indicator

CHECK TUR-0521, Generator/Transformer/Lo Temperature & Thr Brg Pos/Speed, Point 07 to determine temperature and rate of temperature change.

17
Q

EK-0119, “EH SYSTEM BACKUP PUMPS P19A & P19B AUTO START”

A

EK-0119, “EH SYSTEM BACKUP PUMPS P19A & P19B AUTO START”

Sensor:

  • 42-357A/42-437A

Trip Setpoints:

  • Control switch in AUTO START position and1750 psig system pressure

Alternate Indication:

  • None

IF EH pressure remains low AND is due to system leakage, THEN REMOVE unit from service per GOP-8.

18
Q

EK-0120, “EH PUMP P19A AND/OR P19B OUT OF SERV”

A

EK-0120, “EH PUMP P19A AND/OR P19B OUT OF SERV”

Sensor: 74-357 74-437
Trip Setpoints:
Control switch in PULL-TO-LOCK position
Alternate Indication:
None

19
Q

EK-0123, “TURB PROT & BLEEDER TRIP CKTS UNDERVOLTAGE”

A

EK-0123, “TURB PROT & BLEEDER TRIP CKTS UNDERVOLTAGE”

Sensor:

  • 374/U1,
  • 374/U2,
  • 374/U3, or
  • 374/U4

Trip Setpoints:

  • Loss of potential

Alternate Indication:

  • None

CHECK CV-0510, S/G E-50A MSIV (MZ-2), and CV-0501, S/G E-50B MSIV (MZ-3), position indication lights on EC-01, Turbine Generator Control Console, illuminated.

IF loss of DC Panel(s) D11-1, D21-1 or D21-2 is indicated, THEN REFER TO AOP-17.

20
Q

EK-0124, “GLAND SEAL CONDENSER E-19 LO VACUUM”

A

EK-0124, “GLAND SEAL CONDENSER E-19 LO VACUUM”

Sensor:

  • PS-0632, Gland Seal Condenser E-19

Trip Setpoints:

  • 10 inches H2O

Alternate Indication:

  • None

CHECK at least one Condensate Pump P-2A or P-2B operating.
CHECK C-1A or C-1B, Gland Steam Condenser Exhauster, operating.
IF necessary, THEN SHIFT Exhausters per SOP-13.

21
Q

EK-0125, “TURBINE –GEN OIL PUMPS P-26, P-27 AUTO START”

A

EK-0125, “TURBINE –GEN OIL PUMPS P-26, P-27 AUTO START”

Sensor:

  • 42-277A / 42-117A

Trip Setpoints:

  • P-26, Turning Gear Oil Pump: 9 psig
  • P-27, Turbine Gen K-1 Emergency Bearing Oil Pp: 6 psig

Alternate Indication:

  • None

Condition is normal after Main Turbine is tripped.

22
Q

EK-0126, “EMERG BRG OIL PUMP P-27 OUT OF SERVICE OVERLOAD”

A

EK-0126, “EMERG BRG OIL PUMP P-27 OUT OF SERVICE OVERLOAD”

Sensor:

  • 74-117 / 49-117

Trip Setpoints:

  • Control switch in PULL-TO-LOCK position

OR

  • Thermal overload (alarm only)

OR

  • 52-117, Emergency T/G Bearing Oil Pump P-27, OPEN

Alternate Indication:

  • None

P-27, Turbine Gen K-1 Emergency Bearing Oil Pp, auto start is blocked.

IF unit was on Turning Gear and P-26, Turning Gear Oil Pump, is NOT in service, THEN VERIFY unit Turning Gear Drive Motor has stopped.
IF control switch is NOT in PULL-TO-LOCK position, THEN: STOP P-27; DETERMINE cause of thermal overload.

23
Q

EK-0127, “TURNING GEAR OIL PUMP P-26 OUT OF SERV/OVERLOAD”

A

EK-0127, “TURNING GEAR OIL PUMP P-26 OUT OF SERV/OVERLOAD”

Sensor:

  • 74-277 49-277

Trip Setpoints:

  • Control switch in PULL-TO-LOCKposition

OR

  • Thermal overload (alarm only)

Alternate Indication:

  • None

P-26, Turning Gear Oil Pump, auto start is blocked.

OPERATOR ACTION:
IF unit was on Turning Gear and P-27, Turbine Gen K-1 Emergency Bearing Oil Pp, is NOT in service, THEN VERIFY Turning Gear Drive Motor has stopped.
IF control switch is NOT in PULL-TO-LOCK position, THEN: STOP P-26.
DETERMINE cause of thermal overload.

24
Q

EK-0128, “TURBINE SHAFT ZERO SPEED”

A

EK-0128, “TURBINE SHAFT ZERO SPEED”

Sensor: 62/ZSX
Trip Setpoints: 0 RPM
Alternate Indication:
None

Alarm indicates K-2, Main Turbine Turning Gear, has either tripped or has not automatically engaged.

NOTE: The stop pushbutton on Panel EC-277 will stop Turning Gear regardless of Panel EC-01 control switch position.

25
Q

EK-0131, “TURBINE L.O. RES VAPOR EXT C5 TRIP”

A

EK-0131, “TURBINE L.O. RES VAPOR EXT C5 TRIP”

Sensor:

  • 42-351, L.O. Reservoir Vapor Extractor C-5A Starter
  • 42-553, L.O. Reservoir Vapor Extractor C-5B Starter

Trip Setpoints:

  • Either breaker B contact with associated control switch in AFTER START position.

Alternate Indication:

  • Control Room running lights
26
Q

EK-0134, “TURBINE/GEN LIFT PUMP LOW DISCHARGE PRESSURE”

A

EK-0134, “TURBINE/GEN LIFT PUMP LOW DISCHARGE PRESSURE”

Sensor:

  • AR/BL

Trip Setpoints:

  • 600 psig with control switch in AUTO START or RUN positions.

Alternate Indication:

  • Local bearing oil lift discharge pressure

Alarm is bypassed when Main Turbine speed is greater than 600 rpm.
OPERATOR

27
Q

EK-0135, “TURBINE/GEN LIFT PUMP TROUBLE

A

EK-0135, “TURBINE/GEN LIFT PUMP TROUBLE

Sensor:

  • B3, B4, B5, B6, D3, D4, D5, D6

Trip Setpoints:

  • Low Suction Pressure (less than or equal to 1 psig) or Suction Filter high d/p with control switch in AUTO SWITCH or RUN positions.

Alternate Indication:

  • EC-277, Turning Gear Console, to determine affected Turbine Bearing Oil Lift Pump
28
Q

EK-0318, “TURBINE PANEL TROUBLE”

A

EK-0318, “TURBINE PANEL TROUBLE”

Sensor:

  • DEH CRT

Trip Setpoints:

  • Priority 3 Alarms
  • (see Attachment 1, “DEH Priority 3 Alarms”)

Alternate Indication:

  • None

CALL UP alarm subscreen.
• PUSH Silence Key to enable reflash of alarm window.
• REFER TO Attachment 1.

29
Q

EK-0320, “MAIN SEAL OIL PUMP P22 TRIP”

A

EK-0320, “MAIN SEAL OIL PUMP P22 TRIP”

Sensor:

  • ‘b’ contact in associated breaker Trip

Setpoints:

  • Breaker tripped with associated handswitch in AFTER CLOSE position

Alternate Indication:

  • None

VERIFY PCV-SO1430, Seal Oil Turbine Backup PCV, from main lube oil maintaining Seal Oil pressure approximately 10 psid on:
DPIT-1491, Exciter End Seal Oil Diff Pressure
DPIT-1492, Turbine End Seal Oil Diff Pressure
IF necessary, THEN START OR VERIFY STARTED P-24, High Pressure Seal Oil Pump.
IF PCV-SO1430, Seal Oil Turbine Backup PCV does NOT maintain Seal Oil pressure, THEN START OR
VERIFY STARTED P-23, Backup Seal Oil Pump.

30
Q

EK-0321, “SEAL OIL BACKUP PUMP P-23, P-24 AUTO START”

A

EK-0321, “SEAL OIL BACKUP PUMP P-23, P-24 AUTO START”

Sensor:

  • P-23, Backup Seal Oil Pump: DPS-1490
  • P-24, High Pressure Seal Oil Pump: 63/TGP-2

Trip Setpoints:

  • P-23: 5 psid
  • P-24: 9 + 2 psig

Alternate Indication:

  • None
31
Q

EK-0322, “SEAL OIL BACKUP P-23 OUT OF SERV OVERLOAD”

A

EK-0322, “SEAL OIL BACKUP P-23 OUT OF SERV OVERLOAD”

Sensor: 74-299 49-299
Trip Setpoints:
Undervoltage or Thermal Overload (alarm only)
Alternate Indication:
None

32
Q

EK-0324, “GENERATOR LO VAPOR EXTRACTOR C7 TRIP”

A

EK-0324, “GENERATOR LO VAPOR EXTRACTOR C7 TRIP”

Sensor: ‘b’ contact in breaker Trip
Setpoints: Breaker tripped with Handswitch in AFTER CLOSE position
Alternate Indication: None

WARNING
Vapors escaping past Generator Bearing Seals
while Extractor C-7 is out of service will contain
Hydrogen.

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