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NLO Systems > TC- Turbine Cooling Water > Flashcards

TC- Turbine Cooling Water Flashcards

1
Q

What is the capacity of each TC pump?

A

100%

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2
Q

Where are the TC pumps located?

A

100’ Turbine Building North East end

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3
Q

Where can the pumps be started from?

A

Normally from Control Room

Can be started locally at the breaker

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4
Q

What is normal TC system header pressure?

A

105 Psig

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5
Q

What happens if header pressure drops to 55 psig?

A

Standby pump will auto start

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6
Q

What is TC maximum allowed temperature? What is the Hi-alarm setpoint?

A

105F

120F

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7
Q

What are the TC pump power supplies?

A

‘A’ – NBN-S01

‘B’ – NBN-S02

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8
Q

What is the capacity of the TC heat exchangers?

A

100% each

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9
Q

What is the heat sink for TC?

A

PW system

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10
Q

Where are the TC HXs located?

A

The north yard just north of the Turbine building

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11
Q

What is the purpose of the TC Surge Tank?

A

Accommodates changes in system volume due to temperature changes

Provides NPSH for the TC pumps

Provides means of detecting leakage into or out of the TC system

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12
Q

Where is the Surge Tank located? What is its capacity?

A

140’ Turbine Building above the TC pumps

500 gallons

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13
Q

Why is Nitrogen used in the Surge Tank? What is the nitrogen pressure kept at? How else is the surge tank protected?

A

To prevent oxygen intrusion that could lead to corrosion

~25psi

over and under pressure protection
local level and pressure indication

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14
Q

What system provides makeup water to the TC surge tank? What is the maintained level band?

A

Demineralized Water

45-51”

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15
Q

Where is the TC Chem Add Tank located? What is the capacity?

A

100’ turbine building just north of the pumps

11 gallons

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16
Q

During normal operations, how far open is the PW outlet valve for the TC HXs?

A

33%

17
Q

Why are the vent valves on top of the hydrogen coolers cracked open during normal ops?

A

To keep air out of the system high point

18
Q

Is the turbine cooling system safety related equipment?

A

no

19
Q

How does the turbine cooling water surge tank maintain level?

A

provided with a level control that signals a demin water make up line control valve to actuate open or closed

20
Q

What system powers the TC pumps?

A

NB

21
Q

How does the TC system interface with NH?

A

powers TC pump motor space heaters

22
Q

How does TC interface with CW?

A

cools the CW pump lube oil coolers

23
Q

Where are the TC system drains routed to?

A

OW system via turbine building drains

24
Q

What type of seals do the TC pumps have?

A

mechanical seals

25
Q

What is the discharge capacity of the TC pumps? Where are they located?

A

17,500 gpm

100’ turbine building north east side

26
Q

What type of heat exchangers are the TC HXs? Is TC in the tubes or shell side?

A

single-pass, counter-flow, shell and tube type

shell side

27
Q

Each TC HX has a relief valve for both the shell and tube side of the HXs. Where is the discharge routed to if there was over-pressurization?

A

the ground

28
Q

What is the required status of the TC HX outlet valve and TCHX bypass valve during operation?

A

one is required to be full open at all times to ensure good system flow

29
Q

What is the normal operating temp. for the TC system?

A

~90-95*F

30
Q

What is the most restrictive HX in the TC system?

A

main turbine lube oil cooler

31
Q

What does keeping TC temp. < 85F ensure?

A

temp. oscillations in support system does not occur

32
Q

How are temperature adjustments made in the TC system?

A

manually at the direction of the control room by adjusting TCHX outlet valve or bypass valve

(when approaching upper limit in the summer, adjustment to the PW outlet valve can be made)

33
Q

When will the TC surge tank pressure relief valve open? When will the safety valve open? Under pressure relief valve?

A

30 psi

100 psi

2” HG or .98 psi

34
Q

What is the impact of the plant if TC system is lost?

A

if TC can not be restored, plant must trip

35
Q

What are the loads cooled by the TC system?

A 
CW pump motor lube oil coolers
generator hydrogen coolers
stator coolers
CD pump lube oil coolers
isophase bus duct cooling
gland steam packing exhauster
main turbine lube oil coolers (2)
main feed pump turbine lube oil coolers (2)
control oil coolers (2)
heater drain pump lube oil coolers (2)
Instrument (3) and service air compressors
secondary sample coolers (4)
36
Q

If there was a tube leak in the TCHX, what system would leak into the other due to higher pressure?

A

PW would leak to TC because the HX is the point in the system where PW is higher pressure than TC

NLO Systems (66 decks)

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