SO: Seal Oil

Question 1

From where does the ESOP take a suction?

Answer 1

The return header not the Vacuum Tank. The Vacuum Tank will fill and LCV-25 in the tank will close.

Question 2

What happens to the Seal Oil System when MTLO is lost?

Answer 2

The Aux Detraining Tank will drain to the Vacuum Tank. The MTLO pressure will no longer hold the check valves closed which effectively makes the SO System a closed system which results in heatup.

Question 3

What powers the ESOP?

Answer 3

NK

Question 4

When will the ESOP trip?

Answer 4

It wont. There are electrical protection alarms but wont trip.

Question 5

How much can H2 purity lower if vacuum is not maintained in the Vacuum Tank?

Answer 5

2% every eight hours.

The air and/or Hydrogen from the oil will be released in the Main Generator.

Question 6

What prevents both filters from being in service at the same time?

Answer 6

A mechanical interlock

Question 7

What is the purpose for the Vacuum Tank in the Seal Oil System?

Answer 7

To maintain H2 purity

Question 8

After the Main Seal Oil pumps, what is the flow path to the Main Generator? (Big Picture)

Answer 8

The line splits into 2 lines downstream of the filters and goes to the Turbine End of the MG and the Collector End of the MG.

Question 9

When does the ESOP auto start?

Answer 9

Main Seal Oil Pump Discharge of 110 psig

Question 10

What is the power supply to the Main Seal Oil Pumps?

Answer 10

NG

Question 11

What is the purpose for the SO Recirc Pump?

Answer 11

Removes gases from the Seal Oil

Question 12

What is normal discharge pressure for the Main Seal Oil Pump?

Answer 12

About 120 psig

Question 13

To where does the seal oil flowing inboard from the shaft seals?

Answer 13

To the hydrogen detraining section and then down to the float valve

Question 14

PDCV- ___ maintains ___ psid between H2 pressure in the Main Generator and the Main Seal Oil Pump discharge pressure.

Answer 14

PDCV-10

8 psid

Question 15

How is vacuum maintained in the Vacuum Tank for the Seal Oil System?

Answer 15

A Vacuum Pump

Question 16

If you receive the SO/H2 DP LO Alarm, what does that signify?

Answer 16

That H2 is escaping from the Main Generator to atmosphere.

Question 17

Describe the normal flow path for Seal Oil.

Answer 17

Vacuum Tank
MSOP
PDCV-10
MG Seals
H2 and Aux Detaining Tanks
MTLO Reservior

Question 18

What happens to SO if you lose the MSOP and the ESOP?

Answer 18

MTLO will supply at about 25psig. Hydrogen pressure in the Main Generator will drop a few pounds lower than the MTLO pressure i.e. H2 leaks out = fire hazard

Question 19

What will happen if the Vacuum Tank in the Seal Oil System becomes inperable?

Answer 19

H2 purity will decrease

2% every 8 hours

Question 20

When would one need to bypass the float valve in the Seal Oil System?

Answer 20

On a high level in the detraining section.

Question 21

What powers the SO Recirc Pump?

Answer 21

NG

Question 22

If you lose the MSOP and the ESOP, how does that affect Main Generator operation?

Answer 22

The MTLO supply pressure of ~25 psig which means that H2 pressure will drop lower than that. Main Generator load will need to be reduced.

Question 23

What is the flow path for SO Recirc Pump?

Answer 23

Takes a suction on the Vacuum Tank and returns the flow to the Vacuum Tank through spray nozzles

Question 24

Can the float valve, LCV-24, in the Seal Oil System be bypassed?

Answer 24

Yes

Question 25

At what vacuum is the Vacuum Tank maintained for the Seal Oil System?

Answer 25

1” HgA