Bleed Steam/FW Heater Drains Flashcards
What are the HDP trips?
- Extreme Low Level in associated heater
- Turbine Trip
- Overload/Overcurrent
- HMO-564 AND HMO-563 fully closed (Middle pump only)
What is required to start the M HDP?
HMO-564 OR HMO-563 required to be full open (interlock)
Why are there check valves in the bleed steam lines?
Prevents turbine overspeed caused by backflow of steam/water to turbine
What determines which Heater Lo-Lo level will trip the Middle HDP?
The positions of the Suction Cross-ties
When do the HDP ELOs open?
- Opens when HDP Discharge flow is < 1250 gpm back to the condensers (2100 gpm for unit 2)
Does #6 FW Heater have an alternate drain?
No
Where does the #6 FW Heaters receive drains from?
RCDT and HPT
Where do the #5 FW Heaters receive drains from on Unit 1?
MSDT, HPT, and # 6 Heater
Where do the #5 FW Heaters receive drains from on Unit 2?
HPT and #6 Heater
Where do the #4 Heaters receive drains from on U1?
LP Turb
Where do the #4 Heaters receive drains from on U2?
MSDT, HP Turb, and #5 Heater
What will a high high lvl in any heater cause?
Isolated heat input to associated heater
What heaters do the HDPs take a suction from on U1?
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
What heaters do the HDPs take a suction from on U2?
The #4 FW Heaters
- N HDP - 4A
- M HDP - 4A or 4B
- S HDP - 4B
This makes sense directionally in the plant
When will Bleed Steam Isolation Valves auto close?
Turbine Trip and Hi-Hi Heater Level
When do FW Heater Alternate Drains auto open?
High Heater level
How will the Heater Alt drains fail?
Open
How will the Heater Norm drains fail?
Closed
What does a high DCTTD indicate?
Low Heater level
Where do the #3, #2 and #1 Condensate Heaters receive drains from and where do they drain to?
- Receive drains from the LP Turbines
- Drain to the next lower Condensate Heater or Condenser (Alt)
- # 1 heaters drain to an external drain cooler
Where do the drain coolers drain to?
Condensers
Which feedwater heaters do NOT have alternate drains?
6 Heaters for both Units
#4 Heaters for Unit 1
How much of the MFP Suction flow are Heater Drain Pumps good for?
25%
What are the power supplies for the Heater Drain Pumps?
RCP Buses
North - D
Middle - B
South - C
What do you do if a HDP Trips?
Lower Turbine Load by 30 MW at 30 MW/Min
