Turbine Trip Setpoints

Question 1

What is the Turbine Thrust Bearing Wear trip setpoint?

Answer 1

Greater than 48 Mils( 8 psig oil pressure)

Question 2

What is the basis for the Turbine Thrust Bearing Wear trip signal?

Answer 2

Indicates Thrust Bearing failure

Question 3

What is the Turbine Generator Lockout Relay trip setpoint?

Answer 3

86G

Question 4

What is the basis for the Turbine Lockout Relay trip signal?

Answer 4

Prevent Turbine Overspeed on a sudden loss of load

Question 5

What is the Turbine RCIC Initiation trip setpoint?

Answer 5

RCIC Initiation

Question 6

What is the basis for the Turbine RCIC initiation trip signal?

Answer 6

Prevent damage to the Main Turbine caused by carryover from the Reactor

Question 7

What is the Turbine Overspeed Mechanical trip setpoint?

Answer 7

110%( 1980 rpm)

Question 8

What is the basis for the Turbine Overspeed Mechanical trip signal?

Answer 8

Prevent damage to the Turbine Blades

Question 9

What is the Turbine Overspeed Backup trip signal?

Answer 9

110.5%( 105% in Standby)

Question 10

What is the basis for the Turbine Overspeed Backup trip signal?

Answer 10

Backup to Mechanical Overspeed Trip

Question 11

What are the two Manual trips for the Main Turbine?

Answer 11

1) Manual Pushbutton 2) Manual Trip Lever at the Front Standard

Question 12

What is the Turbine High RPV Level trip setpoint?

Answer 12

Level 8( 219 inches)

Question 13

What is the basis for the Turbine High RPV Level trip signal?

Answer 13

Prevent damage to the Main Turbine caused by carryover from the Reactor

Question 14

What is the Turbine High Vibration trip setpoint?

Answer 14

12 Mils

Question 15

What is the basis for the Turbine High Vibration trip signal?

Answer 15

Prevent loosened part damage - Indication of a severe problem

Question 16

What is the Turbine High-High MSR Level trip setpoint?

Answer 16

1) 195 inches 1A/1B 2) 217 inches 2A/2B

Question 17

What is the basis for the Turbine High-High MSR Level trip signal?

Answer 17

Prevent moisture carryover to the Low Pressure Turbine

Question 18

What is the Turbine Loss of Stator Cooling Runback trip setpoint?

Answer 18

1) 81 degrees C at the Stator outlet 2) 42.5 psig at the Stator inlet

Question 19

What is the basis for the Turbine Loss of Stator Cooling Runback trip signal?

Answer 19

Prevent overheating of the Generator Stator Windings

Question 20

What is the Turbine Loss of 125 VDC trip setpoint?

Answer 20

Turbine less than 75% rated speed

Question 21

What type of trip signal is the Turbine Loss of 125 VDC(energize/de-energize)?

Answer 21

Loss of 125 VDC signal energizes to cause a trip

Question 22

What is the basis for the Turbine Loss of 125 VDC trip signal?

Answer 22

Loss of Control Power source

Question 23

What is the Turbine Loss of 24 VDC trip setpoint?

Answer 23

Loss of 24 VDC

Question 24

What is the basis for the Turbine Loss of 24 VDC trip signal?

Answer 24

Loss of Trip Power

Question 25

What is the Turbine Loss of Both Speed Signals trip setpoint?

Answer 25

Greater than 100 rpm

Question 26

What is the basis for the Turbine Loss of Both Speed Signals trip signal?

Answer 26

Loss of EHC reference greater than 100 rpm

Question 27

What is the Turbine Low Condenser Vacuum trip setpoint?

Answer 27

8.1 inches of Hg absolute

Question 28

What is the basis for the Turbine Low Condenser Vacuum trip signal?

Answer 28

Prevent damage due to overheating or water hammer

Question 29

What is the Turbine Low Bearing Oil Header Pressure trip setpoint?

Answer 29

12 psig

Question 30

What is the basis for the Turbine Low Bearing Oil Header Pressure trip signal?

Answer 30

Prevent bearing damage

Question 31

What is the Turbine Low EHC Fluid Pressure trip setpoint?

Answer 31

1100 psig

Question 32

What is the basis for the Turbine Low EHC Fluid Pressure trip signal?

Answer 32

Prevent loss of Turbine control

Question 33

What is the Turbine Low ETS Pressure trip setpoint?

Answer 33

400 psig

Question 34

What is the Turbine Low MSOP Discharge Pressure trip setpoint?

Answer 34

100 psig

Question 35

When is the Turbine Low MSOP Discharge Pressure trip signal active?

Answer 35

Greater than 75% rated Turbine speed

Question 36

What is the basis for the Turbine Low MSOP Discharge Pressure trip signal?

Answer 36

Indicates Main Shaft Oil Pump failure

Question 37

What are all of the Main Turbine trip signals?

Answer 37

1) Thrust Bearing Wear 2) Generator Lockout Relay 3) RCIC Initiation 4) Overspeed Mechanical 5) Overspeed Backup 6) Manual Trip Pushbutton 7) Manual Trip Lever 8) High RPV Level 9) High Vibration 10) High-High MSR Level 11) Loss of Stator Cooling Runback Failure 12) Loss of 125 VDC 13) Loss of 24 VDC 14) Loss of Both Speed Signals 15) Low Condenser Vacuum 16) Low Bearing Oil Header Pressure 17) Low EHC Fluid Pressure 18) Low ETS Pressure 19) Low MSOP Discharge Pressure