U2 Seal Oil

Question 1

What are the Air Oil Pump auto starts?

Answer 1

• Air Oil supply press < 4.0 psi higher than H2 press
• Low Dicharge pressure at 15 psi

DC has a time delay

Question 2

What is the U2 Vacuum Oil Pump trip for U2 Seal oil?

Answer 2

Low Vac Oil Tank Level after 10 sec delay

Will restart once level is restored

Question 3

What is the U2 Vacuum Oil Vacuum Pump trip for U2 Seal oil?

Answer 3

High Vacuum Oil Tank Level after a 10 sec delay

Will restart when level recovers

Question 4

What is the U2 Hydrogen Oil pump trip for U2 Seal oil?

Answer 4

Low suction level after a 10 sec time delay

Restarts when level recovers

Question 5

At what pressure do we maintain Air Oil at?

Answer 5

7 psi higher than Machine Gas pressure

Question 6

If the air oil pressure reg valve, LRV-608, fails closed, what happens to Air Oil?

Answer 6

LRV-610 maintains a constant Air Oil pressure at 75 psi

Question 7

What maintains Suction Level in the H2 Oil System?

Answer 7

Hydrogen Oil Pump Disch Pressure Reg Valves LRV-606/607

Question 8

If you get a high level in the H2 seal oil system, what happens?

Answer 8

LRV-603, Hydrogen Oil Overflow Valve, opens to maintain level from getting backed up into generator

Question 9

If you lose hydrogen oil, what happens?

Answer 9

Vacuum Oil will supply it. There will be a loss of H2 Purityy

Question 10

If you lose Vacuum Oil, what happens?

Answer 10

Hydrogen Oil will be maintained by Air Oil

(Follows what it sees on the Vacuum oil header )

Question 11

If you lose Air Oil, what what happens?

Answer 11

Hydrogen will be released from the Generator. You must shut down.

Question 12

What cools the hydrogen oil coolers for Unit 2 Seal Oil?

Answer 12

NESW

Question 13

At what pressure is Vacuum Seal Oil maintained?

Answer 13

6 psi more than Air Oil (by saftey valves)

Question 14

At what pressure is H2 Seal Oil maintained?

Answer 14

It follows vacuum oil pressure

Question 15

On a diaphram failure, which way does LRV-608, Air Oil Pressure Reg Valve, fail?

Answer 15

Closed

Question 16

If the H2 sensing line fails (sensing line of machine gas pressure), how will LRV-608, Air Oil Pressure Reg Valve, react?

Answer 16

Fails open filling up the Vac-Oil Tank (loss of Air-Oil)

Question 17

What happens if LRV-603, H2-Oil overflow valve, fails open?

Answer 17

results in rapid release of H2 gas to H2 detraining siphon

Question 18

What happens if LRV-603, H2-Oil overflow valve, fails closed?

Answer 18

result in oil backing up into Generator

Question 19

Where is the Vacuum Oil Tank supplied with oil from?

Answer 19

5 Bearing Oil Drain or the Air-Oil Bypass Header

Question 20

What is the purpose of the Unit 2 Vacuum Oil Vacuum Pump?

Answer 20

Allows removal of any air, hydrogen or oil vapor in vacuum oil

Question 21

Where do the Unit 2 Air Oil Pumps take suction from?

Answer 21

Main Turbine Lube Oil Tank

Question 22

What happens if the Suction Level is too high for the Hydrogen Oil SysteM?

Answer 22

Hydrogen Oil Reg opens and drains to the Hydrogen Detrain/Syphon Tank