Bleed Steam/FW Heater Drains

Question 1

What are the HDP trips?

Answer 1

• Extreme Low Level in associated heater
• Turbine Trip
• Overload/Overcurrent
• HMO-564 AND HMO-563 fully closed (Middle pump only)

Question 2

What is required to start the M HDP?

Answer 2

HMO-564 OR HMO-563 required to be full open (interlock)

Question 3

Why are there check valves in the bleed steam lines?

Answer 3

Prevents turbine overspeed caused by backflow of steam/water to turbine

Question 4

What determines which Heater Lo-Lo level will trip the Middle HDP?

Answer 4

The positions of the Suction Cross-ties

Question 5

When do the HDP ELOs open?

Answer 5

• Opens when HDP Discharge flow is < 1250 gpm back to the condensers (2100 gpm for unit 2)

Question 6

Does #6 FW Heater have an alternate drain?

Answer 6

No

Question 7

Where does the #6 FW Heaters receive drains from?

Answer 7

RCDT and HPT

Question 8

Where do the #5 FW Heaters receive drains from on Unit 1?

Answer 8

MSDT, HPT, and # 6 Heater

Question 9

Where do the #5 FW Heaters receive drains from on Unit 2?

Answer 9

HPT and #6 Heater

Question 10

Where do the #4 Heaters receive drains from on U1?

Answer 10

LP Turb

Question 11

Where do the #4 Heaters receive drains from on U2?

Answer 11

MSDT, HP Turb, and #5 Heater

Question 12

What will a high high lvl in any heater cause?

Answer 12

Isolated heat input to associated heater

Question 13

What heaters do the HDPs take a suction from on U1?

Answer 13

The #5 FW Heaters
- N HDP from 5B
- M HDP from 5A or 5B
- S HDP from 5A

This makes sense directionally in the plant

Question 14

What heaters do the HDPs take a suction from on U2?

Answer 14

The #4 FW Heaters
- N HDP - 4A
- M HDP - 4A or 4B
- S HDP - 4B

This makes sense directionally in the plant

Question 15

When will Bleed Steam Isolation Valves auto close?

Answer 15

Turbine Trip and Hi-Hi Heater Level

Question 16

When do FW Heater Alternate Drains auto open?

Answer 16

High Heater level

Question 17

How will the Heater Alt drains fail?

Answer 17

Open

Question 18

How will the Heater Norm drains fail?

Answer 18

Closed

Question 19

What does a high DCTTD indicate?

Answer 19

Low Heater level

Question 20

Where do the #3, #2 and #1 Condensate Heaters receive drains from and where do they drain to?

Answer 20

• Receive drains from the LP Turbines
• Drain to the next lower Condensate Heater or Condenser (Alt)
• # 1 heaters drain to an external drain cooler

Question 21

Where do the drain coolers drain to?

Answer 21

Condensers

Question 22

Which feedwater heaters do NOT have alternate drains?

Answer 22

6 Heaters for both Units

#4 Heaters for Unit 1

Question 23

How much of the MFP Suction flow are Heater Drain Pumps good for?

Answer 23

25%

Question 24

What are the power supplies for the Heater Drain Pumps?

Answer 24

RCP Buses
North - D
Middle - B
South - C

Question 25

What do you do if a HDP Trips?

Answer 25

Lower Turbine Load by 30 MW at 30 MW/Min