Main Condenser, Condensate and Feedwater Alarms Flashcards
EK-0106 “EXHAUST HOOD HI TEMP 217 °F”
EK-0106 “EXHAUST HOOD HI TEMP 217 °F”
- Indicates low steam flow thru turbine (inadequate cooling) or low condenser vacuum.
- Exhaust hood sprays operate automatically.
- Turbine must be shutdown if temperature is ≥ 250 °F for ≥ 15 minutes.
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 Temperature
- TI-0595, #2 LP Exhaust Hood Temperature
EK-0110 “VACUUM PRETRIP”
EK-0110 “VACUUM PRETRIP”
Sensor: 63/LV, Turbine Low Vacuum Pretrip
Trip Setpoints:
- 21.5” Hg decreasing
Alternate Indication:
- Turbine Backpressure
Indicates loss of circulating water, high circulating water temperature, excessive air inleakage, or air ejector failure
Automatic Turbine trip at 18-21 inches Hg
EK-0111 “VACUUM LO”
EK-0111 “VACUUM LO”
Sensor: PS-0761, Condenser Low Vacuum Pressure Switch
Trip Setpoints:
- 24” Hg
Alternate Indication:
- Turbine Backpressure
- PT_0763 (PPC) alarms at 6” Hg Turbine Backpressure.
Indicates loss of circulating water, high circulating water temperature, excessive air inleakage, or air ejector failure
Automatic Turbine trip at 18-21 inches Hg
EK-0122 “EXHAUST HOOD HI TEMP 250°F”
EK-0122 “EXHAUST HOOD HI TEMP 250°F”
Sensor: TS-0537 TS-0545
- Trip Setpoints:
250°F
Alternate Indication:
- TI-0594, #1 LP Exhaust Hood Temperature
- TI-0595, #2 LP Exhaust Hood Temperature
If Main Generator is on-line, raising load should lower Exhaust Hood temperature.
EK-0142 “FEED PP TURB DRAIN TANKS HI LEVEL”
EK-0142 “FEED PP TURB DRAIN TANKS HI LEVEL”
Sensor:
- T-26A: LS-0546
- T-26B: LS-0547
Trip Setpoints:
- 20” from bottom of tank
Alternate Indication:
- T-26A LG-0546
- T-26B LG-0547
Defective drain trap or incorrect valve alignment
There is an overflow
If left uncorrected, water could backup into the turbine and cause damage
EK-0143 (0149) “FW PUMP P1A (P1B) TURBINE K7A (K7B) TRIP”
EK-0143 (0149) “FW PUMP P1A (P1B) TURBINE K7A (K7B) TRIP”
Indicates either the HP and LP T&T valve closed.
Due to lowered FW flow to SGs, can result in Rx trip
EK-0144 (0150) “FW PUMP P1A (P1B) TURBINE K7A (K7B) LO VACUUM”
EK-0144 (0150) “FW PUMP P1A (P1B) TURBINE K7A (K7B) LO VACUUM”
Sensor: PS-0584 (Turbine Driver K-7A Low Vacuum Switch)
Trip Setpoints: 20” Hg Vacuum
Alternate Indication: None
Indicates problem with FW turbine seals or seal steam, or low vacuum in the Main Condenser
Will result in reduced FW Pump efficiency
EK-0145 (0151) “FW PUMP P1A (P1B) TURBINE K7A (K7B) HI VIB/THRUST”
EK-0145 (0151) “FW PUMP P1A (P1B) TURBINE K7A (K7B) HI VIB/THRUST”
Sensor:
- VT-0562
- VT-0563
- TH-0563
Trip Setpoints:
- Vibration: Alert 2.5 mils,
- Thrust: Alert 5 mils North or 18 mils South
Alternate Indication:
- None
Indicates bearing or balance problem, or abnormal lube oil temperature or flow
MFP is required to be shutdown if the problem is a thrust failure or if vibration rises to 3.5 mils.
High Vibration does not have a trip function. Feedwater Pump Turbine is tripped by TH-0563 at 12 mils North (towards pump or normal), or 24 mils South (away from pump or counter) on thrust failure.
EK-0146 “FW PUMPS LO SUCTION PRESS CHANNEL TRIP”
EK-0146 “FW PUMPS LO SUCTION PRESS CHANNEL TRIP”
Sensor:
- PSX-0783 (Suction Press Channel Trip for FW Turbine)
- PSX-0784, or
- PSX-0785
Trip Setpoints:
- 250 psig
Alternate Indication:
- None
At least one of three lo suction pressure switches is tripped (#250). 2/3 will trip the pump
Pumps will trip at 250 psig after 3 seconds.
EK-0147 (0153) “FW PUMP P1A(P1B) TURBINE K7A (K7B) BEARING HI TEMP”
EK-0147 (0153) “FW PUMP P1A(P1B) TURBINE K7A (K7B) BEARING HI TEMP”
TIA-1434 (Pump Thrust Bearing – Active Face)
TIA-1435 (Pump Thrust Bearing – Inactive Face)
TIA-1436 (Pump Journal Bearing – Thrust Bearing End)
TIA-1437 (Pump Journal Bearing – Coupling End)
TIA-1438 (Turbine Journal Bearing – Exhaust End)
TIA-1439 (Turbine Thrust Bearing – Active Face)
TIA-1440 (Turbine Journal Bearing – Gov End)
Trip Setpoints:
- TIA-1434/1435 – 180°F
- TIA-1436/1437 – 185°F
- TIA-1438/1439/1440 – 200°F
Indicates bearing damage or abnormal oil temperature or flow
Can lead to high vibration and/or bearing damage and MFP trip
EK-0148 (0154) “FW PUMP P1A (P1B) LO SUCTION FLOW OR LO DISCH PRESS”
EK-0148 (0154) “FW PUMP P1A (P1B) LO SUCTION FLOW OR LO DISCH PRESS”
Sensor:
- FS-0709, Feedwater Pump Suction P-1A Flow Switch
- PS-0701, Feedwater to Heater E-6A Pressure Switch
Trip Setpoints:
- 2500 gpm
- 800 psig
Alternate Indication:
- None
May indicate inadequate number of Condensate or Heater Drain Pumps operating, or Condensate Recirc Valve CV-0730 open
Can result in low MFP suction pressure trip, or low MFP flow to SGs and Reactor trip
EK-0155 “CONDENSATE PUMP TRIP”
EK-0155 “CONDENSATE PUMP TRIP”
Pump breaker open with control switch in “after start”.
Results in lower flow to MFPs, low MFP suction pressure and possible MFP trip, and possible Reactor trip on low SG level.
EK-0156 (0162) “CONDENSATE PUMP P2A (P2B) HI TEMP OR O.L.”
EK-0156 (0162) “CONDENSATE PUMP P2A (P2B) HI TEMP OR O.L.”
Trip Setpoints:
- 240°F Motor Winding
- 160°F Motor Thrust Bearing
- 185°F (local) Thrust Bearing Oil
- 415 amps
EK-0157 (0163) “CONDENSATE PUMP P2A (P2B) DISCHARGE LO PRESS”
EK-0157 (0163) “CONDENSATE PUMP P2A (P2B) DISCHARGE LO PRESS”
Setpoint 390 psig
Indicates excessive loading on the condensate system, heater tube leaks, or other leakage paths
Continued operation could result in motor overload and pump trip
EK-0158 (0159) “FW TURBINE K7A (K7B) OIL SYSTEM TROUBLE”
EK-0158 (0159) “FW TURBINE K7A (K7B) OIL SYSTEM TROUBLE”
Indicates Auxiliary Oil Pump auto start, undervoltage, or overload, low bearing oil pressure, or high/low oil sump level
Trip Setpoints:
- Auxiliary Oil Pump Auto Start
- Auxiliary Oil Pump Undervoltage
- with Handswitch in AUTO
- Aux. Oil Pump Overload (alarm only)
- 12 psig bearing oil - low.
- Low/High Oil Sump Level: 24”/32” from bottom
