Generator H2

Question 1

Where does the Generator Condition Monitor and H2 Purity Monitor get its flow from?

Answer 1

• Differential pressure produced by the fans attached to the generator rotor provide the motive force thru the Condition Monitor and the Hydrogen Purity Monitor.

Question 2

How is the H2 purged from the Generator?

Answer 2

• CO2 is used

Question 3

When will 12-GSO-251, Bulk H2 Storage Tank Outlet Header Valve, go closed?

Answer 3

• Closes on low turbine building header press < 50# which prevents H2 leak to Turbine Building.

Question 4

How do you reset 12-GSO-251, Bulk H2 Storage Tank Outlet Header Valve, after an auto closure?

Answer 4

• Push and hold local reset pushbutton until downstream # of GSO-251 builds back up to > 50# in the header

Question 5

What are the Generator H2 coolers cooled by?

Answer 5

• TACW

Question 6

What H2 purity does each unit need to maintain?

Answer 6

• U1 > 96%

- U2 > 94%

Question 7

What is the Hydrogen flowpath within the Generator?

Answer 7

• Fans both ends –> Turbine and colector ends –> along rotor shaft and stator core –> through gaps –> vent holes –> back through center of rotor and stator —> coolers –> back to suction of the fan

Question 8

What does Generator Hydrogen mainly cool?

Answer 8

• The Rotor

Question 9

What are normal pressures for Hydrogen Gas in the generator for both units?

Answer 9

• U1 75#

- U2 60#

Question 10

How does plant support the generator?

Answer 10

• Plant air provides a safe generator atmosphere for maintenance activities