Extraction Steam, Heater Vents, and Drains

Question 1

Extraction Steam, heater vents, and Drains have 3 major functions.
(ESHVAD)

Answer 1

• Preheating the feedwater
• Venting of non-condensable gases from the feedwater heaters and moisture separator reheaters
• Draining of the condensate back to the hotwell

Question 2

Feedwater heaters use what to heat feedwater/condensate? By how much from 1st to last FW Heater? How much each heater?

Answer 2

• Extraction steam heats
• 99F to 435F from 1A/B to 6A/B
• Each heater increases heat by about 50F

Question 3

FW heater drains, drain to? (Normal flowpath)

Answer 3

-4A/B to 3A/B to 2A/B to 1A/B to Condenser hotwell

Question 4

FW Heat Drains, drain to? (Alternate)

Answer 4

• 4A/B to condenser
• 3A/B to condenser
• 2A/B to condenser

Question 5

FW Heaters 5A/B and 6A/B get extraction steam from?

Answer 5

-HP turbine

Question 6

FW Heater 5A/B drains to?

Answer 6

-Drains to the suction of the Heater Drain Pumps

Question 7

FW Heater 6A/B drain to?

Answer 7

-Heater drain tank

Question 8

MSR’s heat steam by? Drains to?

Answer 8

• Takes steam off the main steam line before it enters the HP turbine to heat exhausted steam from the HP turbine before entering the LP turbines.
• Shell side drains to Heater drain tank (liquid)
• Tube side drains to MSR drain tank

Question 9

What goes in the shell side of the 6A/B FW heaters?

Answer 9

-MSR drain tank and HP turbine extraction steam

Question 10

FW Heaters 3A/B and 4A/B have how many non-return valves?

Answer 10

-1 each

Question 11

FW Heaters 5A/B and 6A/B have how many non-return valves?

Answer 11

-2 each

Question 12

Quenching valves purpose? located?

Answer 12

• To deliver cool condensate water to HDT to keep the flashings of the saturated water in the tanks.
• Once opened they remain open for 6 min.
• North Mezz lvl

Question 13

1A/B and 2A/B FWH have how many drains?

Answer 13

• 3 drains
• Both alternate to Condenser
• Both Emergency dump to condenser
• 2A/B drains to 1A/B normally