Feedwater Pump/Turbine Lube Oil System

Question 1

What is the purpose of the FWP/Turbine lube oil system?

Answer 1

Provides lube oil to the bearings of the FWP and turbine.
Supplies control oil to the FWP turbine control system

Question 2

MFWP lube oil pump, which stage provides low pressure oil to supply the FW pump and turbine bearing headers?
What does the 4th stage provide?

Answer 2

First stage.
Higher pressure discharge used to supply the FW turbine control oil header

Question 3

What provides the cooling medium to the FP lube oil system

Answer 3

TC

Question 4

What pressure is maintained in the LP oil header?

Answer 4

55psig

Question 5

What happens if we lose AC power to the oil pumps?

Answer 5

Emergency pump discharges directly into the pump and turbine bearing oil supply lines, bypassing the oil coolers and filters

Question 6

What are the regulators for the bearing headers set at?

Answer 6

12psig

Question 7

What powers the MFW main oil pumps?

Answer 7

NH

Question 8

What powers the vapor extractor blowers?

Answer 8

NH

Question 9

What does NK power in the FW lube oil system?

Answer 9

MFW emergency oil pumps

Question 10

What system purifies the feed pump lube oil and transfers lube oil to and from the reservoir?

Answer 10

Lube oil storage, transfer and purification system (LOST)

Question 11

What is the capacity of the FW pump oil reservoir?

Answer 11

1000gallons

Question 12

Where is the the lube oil reservoir located?

Answer 12

Front of the turbine and extends under the governor casing

Question 13

where are the FWP/turbine main oil pumps located?

Answer 13

mounted in the reservoir with the motors on the reservoir

Question 14

What is the pressure of the low pressure discharge?

Answer 14

60-65psig

Question 15

What is the pressure reduced to for the bearings?

Answer 15

12psig

Question 16

What is the pressure of the high pressure discharge?

Answer 16

220psig

Question 17

under normal operations, how many lube oil pumps are running?

Answer 17

1 running and 1 in standby

Question 18

When would the standby lube oil pump start?

Answer 18

Low oil header pressure of 195psig (high pressure oil header is the one monitored)

Question 19

what is the purpose of the TEST push button for the lube oil pumps and where is that switch normally operated?

Answer 19

to test the auto start feature of the main lube oil pumps.
normally done from the control room

Question 20

What is the discharge pressure of the emergency lube oil pump?

Answer 20

12psig

Question 21

when will the emergency lube oil pump auto start? what is it meant for?

Answer 21

Upon receipt of a pump and turbine bearing low oil pressure of 37 psig.
only provides lube for coast down since it doesnt supply control oil or the trip headers

Question 22

Where are the lube oil coolers located?

Answer 22

110’ turbine bearing at the end of the feed pumps

Question 23

where are the vapor extractors located?

Answer 23

140’ turbine building

Question 24

What is the purpose of the vapor extractors?

what else does the vapor extractors do?

Answer 24

to create negative pressure in the oil reservoir, which will cause an inward flow of air thru the bearing oil deflectors in the bearing housing that will eliminate leakage of oil out thru the oil deflectors.

They also remove explosive gasses and air moisture in the MFWP oil reservoir

Question 25

What would be the adverse effect of too much vacuum in the lube oil reservoir?

Answer 25

can draw contaminates into the system and oil out the vent line

Question 26

What would be the adverse effect of losing feedwater pump/turbine lube oil?

Answer 26

One feed pump, results in reactor cutback
Two feed pumps result in reactor trip and aux feed will be used to fill the S/Gs

Question 27

How is the system affected by a loss of TC?

Answer 27

If lost for an extended period of time, the plant will have to be shut down and the feed water pumps stopped.