Bleed Steam and Feedwater 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

• prevent backflow of steam/water to turbine preventing possible turbine overspeed.

Question 4

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

Answer 4

• The positions of the Suction Cross-ties determines which heater Lo-Lo Level will trip the M HDP

Question 5

When do the HDP ELOs open?

Answer 5

• Opens when HDP Discharge flow is < 1250 gpm back to the condensers

Question 6

How much MFP suction flow are HDPs good for?

Answer 6

• 25%

Question 7

Does #6 FW Heater have an alternate drain?

Answer 7

• No

Question 8

Where does the #6 FW Heater receive drains from and where does itself drain to?

Answer 8

• RCDT and HPT- Drains to: - #5 FW Heater - No ALT Drains

Question 9

Where does the #5 FW Heater receive drains from and where does itself drain to on U1?

Answer 9

• MSDT, HPT, # 6 Heater - Drains to: - HDP suction - Condenser (Alt)

Question 10

Where does the #5 FW Heater receive drains from and where does itself drain to on U2?

Answer 10

• HPT, #6 Heater- Drains to: - #4 Heater - Condenser (Alt)

Question 11

Where does the #4 Heater receive drains from and where does itself drain to on U1?

Answer 11

• LP Turb- Drains to: - #3 Heater - (NO Alt Drain)

Question 12

Where does the #4 Heater receive drains from and where does itself drain to on U2?

Answer 12

• MSDT, HP Turb, #5 Heater- Drains to: - HDP - Condenser (Alt)

Question 13

What will a high high lvl in any heater cause?

Answer 13

• Isolated heat input to associated heater

Question 14

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

Answer 14

• N HDP - 5B - S HDP - 5A

Question 15

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

Answer 15

• N HDP - 4A - S HDP - 4B

Question 16

What does bleed steam supply in U1?

Answer 16

• Aux Steam (#4 htr)

Question 17

Which Heaters do not have check valves?

Answer 17

• U1 #1 Heaters- U2 #1, 2, and 4 heaters

Question 18

When will Bleed Steam Isolation Valves auto close?

Answer 18

• Close on Turbine Trip and Hi-Hi Heater Level

Question 19

When do FW Heater Alternate Drains auto open?

Answer 19

• High Heater level

Question 20

How will the Heater Alt drains fail?

Answer 20

• Open

Question 21

How will the Heater Norm drains fail?

Answer 21

• Closed

Question 22

What does a High Total Temp Difference (TTD) indicate?

Answer 22

• Low Heater level

Question 23

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

Answer 23

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

Question 24

Where do the drain coolers drain to?

Answer 24

• Condensers