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systems > Condensate > Flashcards

Condensate Flashcards

1
Q

Where does main condenser collects from ?

A

-Main Turbine Exhaust Steam
-MFWP Exhaust Steam
-Extraction Steam Drains from LPFW Heaters
-Other equipment

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2
Q

How is each condenser section divided into two halves ?

A

1A,2A
1A,2B
1C,2C

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3
Q

What helps maintain vacuum in the condenser shells ?

A

Established & maintained by both Condenser Air Removal & condensing action of exhaust steam

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4
Q

What is the vacuum in each condenser shell?

A

A shell: 1.5 - 2.5HgA
B shell: 2.0 - 2.5HgA
C Shell: 2.8 - 4.3HgA

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5
Q

Why do the tube bundles in each condenser shell get longer ?

A

Longer in each shell because circulating water gets warmer as it goes through each shell

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6
Q

Where are the AR system installed for each tube bundle ?

A

AR system installed in middle of each tube bundle

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7
Q

Why is AR system installed in middle of each tube bundle ?

A

-Minimize condenser pressure & maximize turbine efficiency
-Minimize oxygen concentration in condensate to prevent oxygen from reaching Steam Generator

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8
Q

What’re the Main Condenser Expansion Joints used for ?

A

-Connects each condenser shell to LP Turbine
-Prevents air leakage into condenser while allowing movement between Turbine Casing & Condenser Sections

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9
Q

Each Main Condenser Expansion Joint has a trough around seal, why would we fill it with water ?

A

Normally kept dry, but could be filled water if joint seal has hole water will be drawn into condenser instead of air

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10
Q

What water is used to fill the Expansion Joint Seal trough ?

A

Filled with Condensate Service Header if there’s a hole in joint seal

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11
Q

If water is introduced to trough, why is important to keep it maintained ?

A

If trough is drained out than it could cause neoprene seal to crack

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12
Q

How is water level maintained in the Expansion Joint Seal trough ?

A

Maintained by locking makeup valve in throttled position to provide trickle of water to trough

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13
Q

What’re the Main Condenser Equalization Ducts used for?

A

Protects condenser from damage due to high DP

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14
Q

Where does the condenser equalizing receive its seal water from?

A

Seal water provided from Condensate Service Header

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15
Q

How do the Condenser Equalizing Ducts work ?

A

-Allows pressure equalization if pressure DP rises between shell
-Water seal will blow out if temperature difference is 30F

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16
Q

How can you indicate level inside the Condenser Equalizing Ducts ?

A

There is a local sight glass to monitor level

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17
Q

What’re the Main Condenser Vacuum Breakers used for ?

A

Installed each condenser section,allows rapid Main Turbine slowing down under normal & emergency conditions

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18
Q

Why is the Vacuum Break Line filled with water? What water is used ?

A

-Filled with water from Condensate Service Header
-Water ensures any leakage past valve will draw water instead of air into condenser

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19
Q

What does the Vacuum Break Line have on the atmosphere side to prevent debris from entering line ?

A

There is a conical screen to prevent debris from entering

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20
Q

What does the inner bottom sump do ?

A

They collect condensate from each half of the condenser shell which is done by a divider plate

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21
Q

What does the divider plate that separates each shell half allow us to do during condenser tube rupture ?

A

It’ll allow us to isolate main condenser half upon a tube leak

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22
Q

What does the water in the inner bottom sump provide ?

A

Forms water seal between LP in shell & HP in hotwell

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23
Q

What do the perforated plates at the bottom of inner bottom dumps do ?

A

Breaks up water & fall more slowly through reheat section

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24
Q

Where does the MFWPT direct it’s exhaust to ?

A

Exhaust directed to A reheat trays, then through hotwell equalization ducts to B reheat trays , then exhaust goes into C condenser and condenses since there no reheat trays

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25
Q

Which condenser shell pressure are the three hot wells at ?

A

Since there is no inner bottom sump in ‘C’ Condenser shell, then all hotwells are at ‘C’ Main Condenser

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26
Q

How do we indicate reheat tray level ?

A

Reheat Tray level sight glass is installed on A & B Condenser halves

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27
Q

How do we collect condensate samples from hotwell?

A

Allows chemically contaminated condensate to be detected when it enters hotwell

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28
Q

What does the salinity detection cabinet provide for the condenser chemistry ?

A

Provided required detention time to close circ water valves, & isolate hotwell halves to prevent chemically contaminated water from reaching steam generators

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29
Q

What does condensate sparging do ?

A

Hotwells can use Aux. Steam directly into Hotwell Reheat Section to preheat condensate secondary plant startup

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30
Q

What power level do we have to reduce to when there is a Main Condenser tube rupture ?

A

40% power level

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31
Q

How many gallons is maintained in the Main Condenser Hotwells ?

A

100,000 gallons of condensate storage & volume

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32
Q

What will automatically close the both hotwell makeup valves ?

A

Both valves are interlocked to close on a CST LO-LO LVL

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33
Q

Where is hotwell draw off taking water from ?

A

Takes water from the discharge of the condensate pump & directs to CST

34
Q

When will the Hotwell level draw off valve close ?

A

-Closes on low suction pressure from Main FW Pump
-Closes on high conductivity in condenser hotwell

35
Q

If the hotwell drawoff valves closes due to high conductivity, how do you reset the valve ?

A

Valve must be reset locally by a placing key locked bypass switch to bypass position

36
Q

What else if the hotwell draw off bypass used for ?

A

Used to drain hotwells to CST during outage

37
Q

What do the condensate pumps do ?

A

Takes condensate from hotwells & send it through LPFWH to the two MFWP

38
Q

What is the capacity of each Condensate Pump ? What is the discharge pressure for the pump ?

A

50% capacity & discharge pressure or 450psig

39
Q

Where does ‘A’ Condensate Pump take suction from ?

A

Takes suction from 2 A,B,& C

40
Q

Where does ‘C’ condensate pump take suction from ?

A

Takes suction from 1A,B, & C

41
Q

Where can the normal & abnormal lineup for the ‘B’ Condensate Pump since it has to suction valves ?

A

-Normal line up can take suction from both hotwell halves
-Abnormal lineup can take suction from either half of hotwells

42
Q

How many Condensate Pumps are normally running ?

A

All three are normally running

43
Q

Where does the Condensate Pump Shaft receive its seal water from ?

A

Receives water from Condensate Service Header to cool & seal shaft packing

44
Q

How does the seal water going to the condensate pump work ?

A

Seal water comes up into pump bowl & overflows via drain line to floor sump

45
Q

What cools the Condensate Pump Motor Upper Bearings ? What is used to cool the oil ?

A

Lubricated with oil, which is cooled by turbine cooling water

46
Q

What cools the condensate pump lower motor bearings ?

A

They’re grease lubricated

47
Q

Why does each condensate pump have a space heater ?

A

Auto turns on when condensate pump is stopped to protect pumps motor from condensation

48
Q

What do the white lights on the CD Pump MCC indicate ?

A

It indicates space heaters are energized

49
Q

What flowrate do the automatic flow control valves maintain in the CD Pump Recirc lines ?

A

Recirc lines had to maintain at least 4500gpm

50
Q

Which valve is interlocked with the CD Pump Recirc line flow control
Valve ?

A

Interlocked with pump suction valves, when suction valve closes Recirc valves will close

51
Q

What is difference about the ‘B’ Condensate Pump Recirc lines ?

A

Recirc lines has two Recirc valves along with two suction valves

52
Q

What’re the Condensate Pump power supplies ?

A

‘A’ CD Pump:NBN-S01
‘B’ CD Pump:NBN-S01
‘C’ CD Pump:NBN-S02

53
Q

What will trip the Condensate Pumps ?

A

-Any CD pump trips if aligned hotwell drops to 30”
-Will trip low flow 36,000gpm following 45 second time delay

54
Q

How could the suction valves for the ‘B’ CD Pump trip the pump ?

A

-Will trip if both of suction valves come off their fully open seat
-One suction valve must be fully open

55
Q

What do the two overboard valves do?

A

Directs condensate pump ‘A’ & ‘C’ discharge to the circ water canal

56
Q

When are the Overboad valves used?

A

-When CST is full & can’t accept drawoff
-When CST temp is to high
-During main condenser tube leak to discharge hotwell contents
-During secondary plant startup for secondary chemistry control

57
Q

When are the overboard valves most commonly used for ? Where are they operated from ?

A

-Commonly used for feed& bleed to remove impurities during plant startup

58
Q

What pressure is the condensate service header reduced to?

A

Reduced to 50-100psig usually maintained high in pressure band

59
Q

What supplies Condensate Service Header when condensate Pump Discharge isn’t available?

A

DW can be supplied by a MOV

60
Q

What’re the major loads on Condensate Service Header ?

A

-CD Pump shaft seal water
-HTR Drain Pump shaft seal water
-Main Condenser expansion joints
-Vacuum breaker makeup water
-Condenser AR Vacuum pump seal water
-Hydrazine & ammonia tank dilution water

61
Q

What is the temperate difference is between #1LPFWH & the #4LPFWH?

A

Water is 120F entering #1LPFWH & 340F exiting the #4LPFWH

62
Q

What happens to inlet & outlet valves of each train of LPFWH, if one receives a HI-HI LVL ?

A

If LPFWH receives a HI-HI LVL then that string of heaters inlet & outlet valves will automatically close

63
Q

Where are the condenser hotwells initially filled during startup ?

A

CST gravity feeds to the condenser hotwells by manual operations of valves

64
Q

What flowpath must be done for condensate & Feedwater systems when starting up secondary system?

A

Long path Recirc & over boarding flow path must be maintained until secondary chemistry is in spec

65
Q

What chemicals can be added to secondary system to improve chemistry ?

A

Hydrazine & ammonia may be added to secondary

66
Q

What flow path can be established once chemistry is in spec ?

A

Hotwell drawoff to the CST can be established

67
Q

When can the 3rd CD Pump be started?

A

Can be started at >20% power

68
Q

What is the normal operations for the Condensate Polishing Demins ?

A

Demins are supposed to be normally bypassed, but they’re usually in service due to chemistry

69
Q

What loads are supplied by Condensate discharge header ?

A

-Condensate Service Header
-LP Turbine Hood Spray
-HTR Drain Pump Mechanical seal water
-FW Pump Seal Water
-Blowdown HEX
-Condensate cross-tie header

70
Q

During plant shutdown what happens to CD Pump when reactor power is being reduced to 50% ?

A

-As power reduces CD Pump mini flow Recirc will increase
-Once <50% power is reached than one CD Pump can be secured

71
Q

When can the second CD Pump be secured during a plant shutdown ?

A

Second CD Pump is secured when plant enters mode 3

72
Q

During plant shutdown what is the last CD pump used for ?

A

-Last CD Pump will maintain long path Recirc, until main condenser is secured
-Last CD Pump will pump down hotwells to either CW Canal or CST
-After all this then pump can be secured

73
Q

What will happen in order, on loss of main condenser vacuum ?

A

-MT will trip
-MFWP will trip
-Reactor will trip on low SG LEVEL
-AFAS will actuate restoring SG LVL
-Steam bypass control system will relieve to atmosphere

74
Q

What happens if there is a sufficient size condenser tube leak ?

A

-Will require isolating the condenser half where leak is at
-Since one half of a condenser shell is isolated, this will require reducing power to 40%
-Hotwell will pump to circ water canal & drained oily waste sump

75
Q

What will happen on a loss of a Condensate Pump ?

A

This will trip ‘B’ MFWP, which will cause reactor power back to 40-60%

76
Q

What happens on a loss of Two Condensate pumps ?

A

-Will cause ‘A’ & ‘B’ MFWP to trip on low suction pressure
-Reactor will trip on low SG LVL.

77
Q

Why would LP nitrogen be injected into ‘B’ MFWP Turbine exhaust ?

A

Will be admitted into main condenser to help purge non-condensable gases

78
Q

How does gland sealing steam interface with Condensate system ?

A

-Unloading valve dump into main condenser
-Steam packing exhaust drain tank vacuum dragged into condenser

79
Q

What happens on loss of NK to condensate system?

A

-Hotwell makeup valves will fail close
-Hotwell drawoff valve will fail close
-Condensate Service Header PCV wil fail closed
-Condensate mini-flow Recirc valve fails open

80
Q

What will happen if you lose Air Removal system ?

A

-Could cause power reduction or tripping reactor
-Causes oxygen concentration to rise which will require more hydrazine

systems (62 decks)

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