U1 Seal Oil

Question 1

What normally supplies U1 Seal Oil to the Generator?

Answer 1

• The Main Seal Oil Pump (MSOP) @ 130#

Question 2

When will the Emergency Seal Oil Pump (ESOP) auto start?

Answer 2

• MSOP disch # < 125#

Question 3

What are the U1 Seal Oil supplies in order with pressures?

Answer 3

• MSOP (130#)
• ESOP (125#)
• Shaft Driven Oil Pmp (120#)
• Bearing Oil Header (25#)

Question 4

When will the Vacuum Pump trip on U1 Seal Oil Tank?

Answer 4

• High Level in the tank

Question 5

Will the Vacuum Pump on U1 Seal Oil Tank restart once High Level Alarm is clear?

Answer 5

• Yes it will restart once High Level Alarm is clear

Question 6

What does the U1 Seal Oil Recirc Pump do?

Answer 6

• Recirc contents of the seal oil tank to retard foaming and aid in removing non condensables and H2

Question 7

What cools U1 Seal oil?

Answer 7

• Bearing Oil Header

Question 8

What is the makeup to U1 Seal oil?

Answer 8

• Bearing Oil Header

Question 9

What pressure do we keep the U1 Seal Oil at and why?

Answer 9

• keeps seal oil pressure 3 - 8# > Gen H2 # to prevent H2 from leaking out

Question 10

Where is the H2 pressure sensed on the U1 Seal Oil?

Answer 10

• gas pressure at the H2 seal drain enlargement tank.

Question 11

Where is the Seal Oil pressure sensed on the U1 Seal Oil?

Answer 11

• Senses seal oil # at the exciter end

Question 12

Where does the MSOP get its suction from?

Answer 12

• U1 Seal Oil Tank

Question 13

Where does the ESOP get its suction from?

Answer 13

• Bearing Oil Header

Question 14

What RPM must the turbine be spinning to allow use of the Shaft Driven Oil Pump as a supply source?

Answer 14

• > 1300 rpm

Question 15

What is the purpose for having U1 Vacuum Tank Nozzles?

Answer 15

• Reduces foaming

- Aids in degassing Seal Oil

Question 16

If you lose oil supplied by the Bearing Oil Header, how is the U-1 Seal Oil being cooled?

Answer 16

• The oil in the U-1 Seal Oil system loses capability of being cooled with the loss of the Bearing Oil Header return

Question 17

How is level maintained in H2 Drain Path for U-1 Seal Oil?

Answer 17

• level maintained in the H2 seal drain enlargement by the float trap

Question 18

How is level maintained in Turbine end Drain Path for U-1 Seal Oil?

Answer 18

• Air Detraining Section receives all oil from the seals and it overflows to bearing oil drain