Main Turbine and Auxiliaries

Question 1

Main Turbine Purpose?

Answer 1

-Receives high pressure steam form the main steam system and converts the thermal energy of the steam into mechanical energy used to turn the main generator.

Question 2

Hp Turbine

Steam enters how? How many stages? First stage pressure is? Used for? Steam Exits?

Answer 2

• Steam enters through 2 stop valves and 4 governor valves.
• 9 stages (18 total)
• First stage pressure is ~800psi, used for Tref
• Exits into 4 exhaust (2 at each end)

Question 3

Gland Sealing Steam System

purpose? Pressure?

Answer 3

• Prevents Leakage of air into steam turbine and steam from leaving turbine.
• Pressure maintained between 3-6psig

Question 4

Gland Steam Condenser and Air Exhausters

Purpose? Power supply?

Answer 4

• Condenser takes the exhaust of the gland steam system and uses it to reheat Condensate.
• Air exhausters discharge air and other noncondensable vapors to the atmosphere
• powered from MMC-4

Question 5

Cylinder Heating Steam is what pressure?

Answer 5

-Maintained 5psig above Hp last stage pressure

Question 6

Turbine Lubricating Oil System purpose?

Answer 6

• Provides oil at presure for lubrication and cooling of Turbine generator bearings and turning gear.
• Backup supply for generator seal oil.

Question 7

Main Turbine Oil Pump

Power supply?

Answer 7

-Shaft driven.

Question 8

AC Turning Gear and Seal oil Back-up pumps

Purpose? Power supply? Comes on at? Located?

Answer 8

• During startup and shutdown periods when the Main Turbine Oil Pump cannot be used, this supplies all oil requirements
• Can supply Seal oil backup for generator
• Powered from MCC-14/MCC-20
• Both pumps start at 8-10psig bearing oil pressure
• Located on top of Lube OIl Reservoir tank

Question 9

DC Emergency Oil Pump

Purpose? Location? Power Supply? Auto starts on?

Answer 9

• Emergency backup for the AC turning gear oil pump
• South of AC turning gear pump
• MCC-C
• Loss of power to AC Turning gear pump/ Low bearing oil pressure 5-8 psig

Question 10

Vapor Extractor for Main Lube Oil Reservoir

Purpose? Power supply? Location?

Answer 10

• Used to eliminate vapors and maintain negative pressure on reservoir
• Powered from MCC-4
• Top of Reservoir

Question 11

Kaydon Lube Oil Filtration system power supply?

Answer 11

-480V Bus 3