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Area 1/2/6 > Condensate > Flashcards

Condensate Flashcards

1
Q

What provides makeup to the Condensate system?

A

CST

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2
Q

Where are the valves for the CD system makeup?

A

Manual- 100’ TB (HCV-154,155)

Automatic- 140’ TB (LV-81, 82)

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3
Q

What is used to fill the CD mini-flow recirc lines prior to first CD pump start?

A

DW

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4
Q

What are the expansion joints?

A

Also known as dogbone seals. Prevent air leakage into the condenser while allowing movement between turbine casings and condenser sections.

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5
Q

What all drains into the main condenser?

A
  • FW pump seal leakoff
  • GS unloading valve (pv-27)
  • 6 of the SBCS control valves
  • LPFW htr drains
  • Turbine casing
  • HP/LP stop valves
  • Above/below seat drains
  • Feed Pump turbine exhaust
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6
Q

If the CD system isn’t available what can supply the CD service header?

A

DW (DWN-HV-275)

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7
Q

What do the Condenser Equalization Ducts do?

A

They are located above the A and B false bottoms; they allow pressure between the sections to equalize if an abnormal pressure/temperature differential develops. The water seal will “blow out” thus equalizing pressure, if the temperature in any section exceeds that in the adjoining section by 30 degrees F.

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8
Q

What is the normal operating level of the hotwell?

A

41-43 inches

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9
Q

What cause a CD pump to trip?

A
  • Hotwell level 30 inches
  • Low mini flow after 45 seconds. (3600 gpm set-point, normal 4500)
  • “B” CD pump will trip if one of its two suction are not full open. (normally both are full open)
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10
Q

Where does blowdown and drawoff go from the CD system?

A

Blowdown- CW (For cleanup/level control)

Drawoff- CST (Level control)

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11
Q

What would cause the hotwell drawoff valve to automatically close?

A
  • High cation conductivity

- Low MFP suction pressure (245 psig)

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12
Q

Explain the override available with the hotwell drawoff valve?

A

On the 140’ of the TB, in the southwest corner. You can override the high cation conductivity to open the hotwell drawoff valve. There is a key switch.

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13
Q

When will the Condensate system makeup valves automatically close?

A

When CST level goes below 30 feet. This is to prevent feeding a leak and draining the CST below our Tech spec level of 29.5 feet.

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14
Q

Where is each condensate pump powered from?

A

PO1A- NBN-SO1
PO1B- NBN-SO1
PO1C- NBN-SO2

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15
Q

Explain the CD pumps?

A 
Three
six-stage
Vertical centrifugal pumps
50 percent capacity
Raise pressure from vacuum to around 440 pound on a common discharge header
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16
Q

Talk about the interlocks within the CD demin inlet, bypass, outlet valves.

A

The inlet valve (HV-191) must be full open to give the outlet valve (HV-199) an open permissive.
The inlet and outlet valves must be open to give the bypass valve a modulate permissive.
The bypass valve (PDV-195) will modulate with a differential pressure lower then 55 psid. Greater then 55 psid the bypass valve will be full open.

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17
Q

How do the CD pump recirc valves fail on a loss of IA?

A

Fail open

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18
Q

What are the tube lengths for each condenser?

A

A- 45.5’
B- 50’
C- 55.25’

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19
Q

What provides cooling for the CD pump LO?

A

TCW

20
Q

What does seal water do for the CD pump?

A

Lubricates and cools the pump seal. It is supplied from the CD service header.

21
Q

How does the Condensate cross-tie pressure control valve (PV-208) fail on a loss of IA?

A

Fails closed

22
Q

Explain how makeup is provided to the condenser?

A

By vacuum drag through the LV-81/82 valves automatically from the CST.

23
Q

How does the Hotwell drawoff valve fail on a loss of IA?

A

Fails closed on a loss of IA

24
Q

Which condenser section has the best vacuum the worst? Why?

A

A-Best
C- Worst
Because CW runs in series through the condenser so as it gets to the ‘C’ section it is warmer and at a higher pressure therefore less vacuum.

25
Q

How does the demin bypass valve fail on a loss of air?

A

Fails open

26
Q

When would you need to change or clean the CD pump suction strainers?

A

7” H2O differential pressure

27
Q

How does the condensate service header pressure control valve fail on a loss of air?

A

Fails closed.

28
Q

Where is the condensate service header pressure controller?

A

100’ turbine building near SE side of condenser

29
Q

Where is DWN-V275, alternate supply to the condensate service header?

A

100’ turbine building on south side near the demin shack

30
Q

Where are the controllers for the hotwell level and drawoff controllers?

A

Control Room

31
Q

Where are the long path recirc valves?

A
  • HV-46 is accessed from the 100 TB up the stairs above the hydrazine addition area.
  • VA-31 is underneath the MFP platform on the ‘B’ side.
32
Q

Why do we have hood spray?

A

Cool-down exhaust hoods during startup

33
Q

How is the condenser filled during initial fill, after an outage?

A

The head from the CST is enough to drive the water into the condenser thru the manual isolation valves.

34
Q

At full power, what position is the CD mini-flow valves in?

A

Fully closed

35
Q

Explain how the upper and lower bearings on a CD pump are lubricated?

A

Upper- Oil

Lower- Grease

36
Q

Explain starting the first condensate pump and filling the CD/FW systems?

A
  • Fill hotwell by gravity feed from CST (HCV-154/155)
  • Fill recirc piping with DW via portable hose
  • Vent suction/discharge piping
  • Check CD pump seal leakoff/TC cooling for LO sat
  • Once first CD pump is running on recirc the rest of the CD/FW system can be filled and vented.
  • Be cautious not to exceed the makeup rate
  • Now to fill the system we use the running pumps discharge bypass valve. (opened a couple turns to slowly fill/ vent the system)
  • When the system is filled/vented it is placed on long path recirc
37
Q

Explain the flowpath for long path recirc.

A
  • CD Pumps to Demins to LPFW htrs bypass MFP’s to HPFW htrs to HV-46/VA-31 back to the condenser
38
Q

Explain the position of the pump bypass valves when on long path recirc.

A

One of the valves will be open 25% and the other will be closed.

39
Q

Explain a controlled shutdown of the CD/FW system going into an outage?

A

Power is reduced to 50%; the first MFP is secured.
After that the first CD pump is secured. Around 2-3% power the 2nd MFP is secured and then another CD pump will be secured. The last CD pump will run on long path recirc.

40
Q

When taking a LPFW Heater out of service; what do we monitor and what do we take out of service first?

A
  • Monitor MFWP suction pressure
  • Take extraction steam out first
  • Remove condensate second
41
Q

What do we need to do big picture if Condenser vacuum is degrading slowly?

A
  • MT load reduced
  • Reactor power reduced (Rods/Boron)
  • If vacuum can’t be maintained trip the turbine
  • Load now to SBCS (1007/1008)
42
Q

If we are using the SBCS via 1007/1008 to control load; what is a caution for us?

A

HW level could decrease quicker then normal makeup capabilities. AO may have to manually makeup at HCV-154/155.

43
Q

At what condenser pressure is the SBCS valves 1001-1006 unavailable?

A

5.5” HgA

44
Q

On a loss of vacuum, what does the AO in the field check?

A

CD expansion joints, CW system, Air removal pumps, Gland seal

45
Q

How much of a condenser tube leak can the CD demins handle?

A

1 gpm of CW in system leakage

Area 1/2/6 (9 decks)

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