Main Condenser, Condensate and Feedwater Alarms Flashcards Preview

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Flashcards in Main Condenser, Condensate and Feedwater Alarms Deck (22):
1

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

2

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

3

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

4

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.

5

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

6

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

7

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

8

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.

9

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.

10

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

11

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

12

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.

13

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

 

14

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

15

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

16

EK-0160 “FDWTR PUMPS LO SUCTION”

EK-0160 “FDWTR PUMPS LO SUCTION”

Sensor:

  • PIA-0786, Main Feed Pump Suction Press Ind Alarm

Trip Setpoints:

  • 305 psig

Alternate Indication:

  • PIA-0786 Control Room Indication

17

EK-0161 “HOTWELL HI LO LEVEL”

EK-0161 “HOTWELL HI LO LEVEL”

Sensor:

  • LS-0729, Hotwell Level Switch
  • LS-0731, Condensate Reject Level Sw

Trip Setpoints:

  • High Level - 81%
  • Low Level - 58%

Low level indicates a leak in the system downstream of the Condensate Pumps or a problem with makeup.

High level indicates a Condenser tube leak or a problem with makeup.

Condensate Reject Valve CV-0731 opens at 76%.

CV-0732, Normal Level Control, opens at 66% and CV-0733, Emergency Fast Makeup Level Control, would open at 58%, but valve is isolated.

Hotwell level indication on C-01/PPC

18

EK-0168 “FEEDWATER HEATERS HI LEVEL

EK-0168 “FEEDWATER HEATERS HI LEVEL

Indicates inadequate drain flow or heater tube leakage, or low pressure/excess extraction flow, or level control problem

High level will cover the tubes and reduce heater efficiency.

If due to heater tube leak, load must be reduced and the heater bypassed and removed from service. SOP-10 restrictions when bypassing heaters:

  • 600 MWe for bypassing any two stages of heaters
  • 97% if bypassing E-6A or E-6B

19

EK-0171 “CONDENSATE PUMP ROOM FLOODING”

EK-0171 “CONDENSATE PUMP ROOM FLOODING”

Indicates a pipe break or high lake level

If level cannot be controlled, reactor must be tripped and Condensate Pumps stopped.

Sensor: LS-5217, or LS-5218, Condensate Pump Room Flooding Level Switches

Trip Setpoints: 572’ Elevation

Alternate Indication:
Local level indications

20

EK-1107 “PRI MAKEUP STORAGE TANK T-81 HI-LO LEVEL”

EK-1107 “PRI MAKEUP STORAGE TANK T-81 HI-LO LEVEL”

  • Setpoint High: 98%, Low: 86%
  • High level indicates excessive makeup to tank.
  • Low level indicates excessive water usage/leak or inadequate makeup.
  • T-81 CV-2008 opens at 88%.
  • LCO 3.7.6 Cond. A may be entered

T-81 level indicator located on C-13

21

EK-1108 “CONDENSATE STORAGE TANK T-2 HI-LO LEVEL”

EK-1108 “CONDENSATE STORAGE TANK T-2 HI-LO LEVEL”

Setpoint High: 98%, Low: 73%

High level indicates excessive makeup to tank.

Low level indicates excessive water usage/leak or inadequate makeup

T-2 Makeup CV-2010 opens at 76%.

LCO 3.7.6 Cond. A may be entered.

T-2 has 2 level indicators located on C-13

22

EK-1110 “STORAGE TANK T2- T7- T81 TEMP”

EK-1110 “STORAGE TANK T2- T7- T81 TEMP”

  • Indicates an abnormal heat source or outside air temperature below 40°F and T-2 Hx problem
  • If temperature lowers to 32°F, the water could freeze.
  • If temperature rises to ≥ 120°F, the plant is in an unanalyzed condition