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Secondary > Condensate > Flashcards

Condensate Flashcards

1
Q

What is the purpose of the main condenser?

A

Condense and collect turbine exhaust steam and various equipment drains.
Collects and stores condensate in the hotwell, acting as a reservoir

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2
Q

what connects the condenser shell to the LP turbine

A

Dog bone

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3
Q

What is purpose of the dog bone seal?

A

prevents air leakage into the condenser while allowing movement between the turbine casings and condenser sections

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4
Q

what fills dog bone trough?

A

condensate service header during degraded vacuum event

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5
Q

What is the purpose of the water sealed condenser equalization duct and where is it located?

A

located above A and B false bottoms.
Allows pressure between the sections to equalize if an abnormal pressure/temp different develops.
The water seal will blow out equalizing the pressure if the adjoined sections exceed a difference of 30F

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6
Q

How is each the condenser protected from over pressure?

A

rupture discs set at 5 psig on associated LP hood

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7
Q

Why is there plastic lathe installed on condenser tubes?

A

prevent vibration damage

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8
Q

why do the tube lengths vary in the 3 condensers?

A

To compensate for the increasing temps

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9
Q

What is the purpose of the condenser waterboxes?

A

provide the supply and return headers to the condenser tubes

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10
Q

Where are the air take-off pipes installed and how far do they extend?

A

at the center of each tube bundle to remove air and non-condensable gases and extend the tube length

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11
Q

how can reheater tray level affect ‘A’ AFP operability after a LOOP?

A

After MSIS level can back up and potentially back up the steam line drains and cause the pump to be inop

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12
Q

Why are the hotwells equipped with spargers?

A

can be used to admit AS directly into the condensate located in the hotwells.
can be done during startup to heat the water for cleanup purposes.
this operation not normally done

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13
Q

Where are the logitudinal divider plates installed? purpose of the plates?

A

They ensure condensate formed around a given set of tube bundles will flow to the associated hotwell half.
This allows continued operation if a tube leak occurs in 1 CW flowpath.
Associated hotwell half can be isolated and pumped out to the CW system by one of the condensate pumps to minimize further secondary system chemistry

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14
Q

What is the purpose of condensate detention time?

A

aids condensate reheating and sampling

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15
Q

why is there a salinity detection bay provided near each water box?

A

to detect CW leakage between the tubes and tube sheet

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16
Q

how much condensate storage volume is provided by the hotwell?

A

100,000 gallons

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17
Q

what is the condensate storage volume based on?

A

4 minutes of operation at valves wide open

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18
Q

What CST level would cause the hotwell makeup valves to auto shut?

A

30’

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19
Q

How do the hotwell auto makeup valves respond to loss of IA?

A

Fail closed

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20
Q

where are the hotwell auto makeup valves located?

A

140’ turbine building

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21
Q

where are the hotwell manual make up valves?

A

100’ turbine building

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22
Q

the draw off auto control valve will open based on the higher of 2 levels of what condenser hotwell?

A

‘C’ condenser

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23
Q

How does the draw off auto control valve react to loss of IA?

A

Fails closed

24
Q

Where are the interlocks associated with draw off auto control valve? (LV-075)

A

it will auto close when either SG feedwater pump suction pressure is low or any condenser hotwell cation is high

25
Q

If LV-075 (auto draw off) closes on high conductivity how can it be operated?

A

key lock bypass switch

26
Q

What else can i use the bypass position for in LV-075?

A

to drain hotwells

27
Q

How are the CD pump suction and recirc valves interlocked?

A

When the suction valve goes closed, the corresponding recirc valve goes closed

28
Q

When will the CD pump suction strainer D/P switch alarm in the control room?

A

5” H2O

29
Q

When are the CD pump strainers required to be cleaned?

A

DP of 7”H2O

30
Q

Where does the seal water for the CD pumps come from?

A

Condensate service header

31
Q

concerning the CD pump how are the upper and lower bearings lubed?

A

Upper lubed with oil cooled by TC
Lower are grease lubed

32
Q

what is the purpose of the CD pump mini flow lines?

A

prevent CD pump overheating

33
Q

What is the CD pump mini flow normally set to by the operator

A

4500gpm

34
Q

What is the low recirc flow trip setpoint?

A

3600gpm after 45 seconds

35
Q

how do the mini flow valves respond to a loss of IA or Power?

A

fail open

36
Q

What happens to the mini flow valves when the associated pump stops or is tripped?

A

solenoid is energized and the valve closes

37
Q

How could the position of the ‘B’ CD pumps 2 suction valves affect the pump?

A

1 of 2 suction valves from 1c or 2c must be full open or the pump will trip

38
Q

What is the normal operating level of the hotwell

A

41 inches

39
Q

At what level in a hotwell half will the associated CD pump trip?

A

30 inches

40
Q

What are the power supplies for the 3 CD pumps?

A

NB (A&B - S01) (C - S02)

41
Q

Which CD pumps have connections to the overboard drain?

A

A and C

42
Q

what is the purpose of the overboard lines?

A

Feed and bleed to remove impurities (rust) following dry layup conditions during refueling outages

43
Q

What must be done prior to using the overboard lines?

A

sampled to make sure its not radioactive

44
Q

what pressure is the condensate reduced to when going into the condensate service header?

A

90psig

45
Q

If no CD pumps are available, what can be used to supply the service header?

A

DW

46
Q

What are the major loads provided by the condensate service header?

A

1)CD pump seals
2) condenser expansion joints
3)vacuum pump makeup
4)Hydrazine and ammonia dilution
5)cooling jacket around the heater drain pump mech seal

47
Q

How are the demin inlet and outlet valves interlocked? (190 &191)

A

When the inlet is opened it gives a permissive to the outlet valve

48
Q

What is the interlock associated with the demin bypass valve? (195)

A

When both inlet and outlet valves are open a modulate permissive for the bypass valve is generated.
The bypass will modulate to maintain set pressure if both the inlet and outlet are open and demin D/P is less than 55 psid, otherwise the bypass will be full open

49
Q

What temp is the condensate as it enters and exits the LPFW heaters?

A

130F entering
330F exiting

50
Q

How do the LPFW heaters respond to a high level?

A

High level control will open to divert to condenser

51
Q

How do the LPFW heaters respond to a high high level?

A

Condensate flow will auto isolate to that heater string by 2 redundant MOVs

52
Q

What is the capacity of the CD pumps at 100% power?

A

Each pumping 8000gpm

53
Q

What happens upon loss of condensate that results in both feed pumps tripping offline?

A

Reactor will trip on low S/G water levels followed by a MT and main generator trip.
Aux feed system will start and restore S/G water levels

54
Q

What happens upon a loss of condensate that results in only one feed pump trip?

A

reactor power cutback will initiate which will reduce turbine and reactor power to between 25% and 75% power

55
Q

What will happen if there is a loss of condenser vacuum?

A

Will prevent SBCS valves from dumping to the condenser.

The main turbine will trip followed by a trip of both main feedwater pumps.

Reactor will trip on low S/G water level and Aux feed system will start to restore S/G level

56
Q

How is CD affected by loss of IA or electrical power?

A

CD pump mini flow valves will fail open, which prevents running the pump with the discharge valve closed and no mini flow that could lead to a loss of suction

57
Q

How is CD affected by loss of IA?

A

1)condensate service header valve will fail closed so header will have to be supplied by DW
2) condensate cross tie pressure control valve will fail closed
3) vacuum breakers isolation valves fail closed
4) Demin bypass valve fails open, which may impact secondary chemistry

Secondary (26 decks)

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