Secondary systems

Question 1

What are the Aux Steam supply sources?

Answer 1

-“C” Bleed Steam
- Unit Main Steam
-Opposite Unit Aux. Steam
-Aux Electric Boilers

Question 2

When is “C” bleed steam used to supply Aux Steam?

Answer 2

Approximately 85% power

Question 3

When is Unit Main Steam used to supply Aux. Steam?

Answer 3

From approximately 25% power until “C” Bleed is high enough to supply Aux Steam at 85% power.

Question 4

When is the Opposite Unit Aux Steam used to supply Aux Steam?

Answer 4

Preferred source during startup, unit shutdown or cleanup until Main Steam can be aligned above 25% power.

Question 5

When are the Aux. Electric Boilers used to supply Aux. Steam?

Answer 5

Used during startup, shutdown or cleanup when the Opposite Units Aux Steam is unavailable.

Question 6

What is the purpose of the ZP (Vacuum Priming) System?

Answer 6

Continuously removes air from the RC and RL systems to ensure both systems are water full. Removes air and non-condensable gasses.

Question 7

Where does ZP (Vacuum Priming) system take suction on?

Answer 7

The inlet and outlet of water boxes of “A” condenser, the “B” outlet water box, and the hydrogen cooler end bells.

Question 8

What is the heating steam for the first stage in the MSR (Moisture Separator Reheater)?

Answer 8

“A” Bleed Steam

Question 9

What is the heating steam for the second stage in the MSR (Moisture Separator Reheater)?

Answer 9

Main Steam

Question 10

What is the condition of the steam leaving the second stage of the Moisture Separator Reheater?

Answer 10

Superheated. Its temperature is raised to approximately 150°F superheat.

Question 11

Where does the first stage drain tank drain to?

Answer 11

“B” feed water heater

Question 12

Where does the second stage drain tank drain to?

Answer 12

“A” feed water heater