Extraction Steam And Drain System

Question 0

What does nitrogen do in the FW heater system?

Answer 0

Provides blanketing in the heaters shell side and HDTs

Question 1

What does DS water in the ED system do?

Answer 1

Used to add cool water to the water volume that is maintained at the bottom of the blowdown stack.

Question 2

What happens to the bleeder trip valves on loss of IA?

Answer 2

The will lose open permissive and go partially closed. They remain open due to steam flow.

Question 3

What cools the heater drain pumps?

Answer 3

Condensate pump header and condensate service header.

Question 4

What provides sealing steam for the GS system?

Answer 4

9th stage extraction

Question 5

How many bleeder trip valves are on FW heaters 3,5,6,7?

Answer 5

One

Question 6

How many BTVs are on FW heater 4?

Answer 6

Two because it has the highest amount of energy left in the steam and it connects to the lowest turbine stage.

Question 7

What happens to the HP heater on a hi hi level alarm?

Answer 7

Extraction steam isolated
Normal level control valve of the preceding heater closes
Affected heaters extraction drain valve opened

Question 8

What happens to a LP heater on a hi hi alarm?

Answer 8

Entire LP train is isolated.
Extraction steam to 3 & 4 heaters isolated
Opens extraction line drain valves for 3 & 4 heaters.

Question 9

Where does gland steam receive sealing steam from?

Answer 9

Main steam
Aux steam
9th stage extraction
Stop and control valves