Main Turbine & Turbine Controls (RQ-C-4762)

Question 1

What is the purpose of the Combined Intermediate Valves (MSR CIV)?

Answer 1

To prevent turbine over speed on a load reject/turbine trip due to residual steam in the MSRs

Question 2

On a turbine trip which lube oil pumps will be running?

Answer 2

All of them

Question 3

What is the difference between MWin and MWout

Answer 3

MWin - Maintains constant MW and allows the control valves to modulate
MWout - Maintains constant control valve position and allows MW to fluctuate

Question 4

What happens if all three Main Turbine Speed pickups fail

Answer 4

If the generator output breakers are OPEN then the turbine trips

Question 5

When the 10%/20% turbine runback is used on the Turbine HMI how much load is removed?

Answer 5

10%/20% of 100% rated turbine load @ 100 MW/min (i.e., 115/125 MW)

Question 6

What automatically initiates AMSAC

Answer 6

If 3/4 feedwater flows are less than 25% AND 2/2 impulse pressures are greater than 40%

Question 7

When AMSAC is actuated what happens

Answer 7

Turbine trips
AFW pumps are started
Flow Conservation initiated

Question 8

What is the purpose of the MSR

Answer 8

To remove moisture, improve efficiency and protect the LPT blades from erosion