Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Systems > Feedwater Pump Turbine > Flashcards

Feedwater Pump Turbine Flashcards

1
Q

What does the Lead Drain Line do ?

A

Lead Drain Valve drains condensate when stop valve is closed to prevent slug of water hitting turbine when stop valve is opened

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What do the Stop Valve Seat Drain Lines do ?

A

Each HP & LP Stop Valves contain Above Seat Drain Line to allow drainage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

When are the Drain Valves operated from ? What is position of valves during full steam load operation ?

A

-Each drain line contains drain valve operated from Control Room
-Drain valves normally closed during full steam load

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What do the lead drain valves bypass lines do ?

A

Bypass lines bypasses lead drain valves continuously drains through orifice to prevent buildup when Lead Drain Valves are closed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What do the HP Stop Valves & LP Stop Valves do?

A

-Open to allow steam to turn Turbine
-Quickly close upon MFWP Turbine trip to stop steam flow into turbine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How are both HP & LP Stop Valves operated ?

A

Hydraulically operated from 200psig Feedwater Pump/Turbine Lube Oil system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How do the HP & LP Stop Valves open ?

A

-Hydraulic piston opens pilot poppet against steam inlet pressure, but isn’t enough pressure to open main valve
-Control Valve must be closed to buildup enough pressure to open Main Valve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How are Stop Valve testing work ?

A

-Each stop valve has relay connected to port which can be opened to drain operating cylinder with tripping it
-When hydraulic oil is drained operating cylinder goes to close direction until port is closed
-Once port is close hydraulic pressure will build up

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Since HP stop valves go fully closed during testing, when should can they be tested ?

A

HP Stop Valves can only be tested when MFWP Turbine is operating on LP steam & HP Control Valve is closed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What interlock prevents HP stop valve from testing ?

A

Interlock prevents testing of HP Stop Valve if HP Control Valve is open

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Why is there a local green indicating light ?

A

Green light is to indicate that HP Control Valve is closed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Where can this HP Stop Valve testing be performed from ?

A

-Can be performed by Pushbutton locally at valve or from control room
-It’s normally done from control room

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Whatre the 2 reasons the LP Stop Valve goes open partially during testing during normal operation?

A

-If LP Stop & Control valves goes closed and it’s main driver for MFWP Turbine it’ll slow down MFWP
-If Stop Fully Closes with control valve open, the stop valve won’t be able to reopen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Where is the LP Stop Valve Test performed from ?

A

Performed from control room

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is normal operation of the HP & LP Stop Valves ?

A

Both HP & LP Stop Valves are open during startup & through speed range of MFWP

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What happens to the Stop Valve & Control Valves during a MFWP Turbine trip ?

A

-Trip signal dumps oil pressure holding Stop & Control Valves open, which will close them

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What happens to Stop Valves on a reset of trip signal ?

A

With control valve closed this results in Stop Valve fully opening upon reset of trip signal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What do the HP & LP Control Valves do ?

A

Allows control of steam admitted to Feedwater Pump Turbine to control speed of Feedwater Pump

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What operates both the HP & LP Control Valves ?

A

They’re hydraulically operated by 200psig Feedwater Pump/Turbine Lube Oil

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

How does each LP Control Valve work in the inside the valve chest cover?

A

-Lift beam lifts five LP Control Valves in sequence to control LP steam into turbine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What happens when steam flow throw LP Control Valve is insufficient ?

A

If steam flow is insufficient for required Feedwater Pump Speed then lift beam will continue to rise until it opens HP Control Valve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What signals control the LP Control Valve assemblies open/close ?

A

Receive signals from electronic Governor which responds to inputs from Feedwater Control system based on desired MFWP speed for SG Water level

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

How do the LP & HP Control Valve assemblies work during MFWP Turbine?

A

1.)LP control valves supplies steam to start spinning turbine,but doesn’t have enough hot reheat steam to get turbine up to speed
2.)As LP Control Valve continues to open, it’ll start lifting HP Control Valve letting steam from Main Steam
3.)As hot reheat steam increases LP Steam will be able to drive turbine, LP Control Valve will start closing HP Control Valve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

How is steam supplied to MFWP Turbine during normal operation ?

A

-LP Control Valves are throttled to admit Hot Reheat steam to ‘D’ MSR as main driver for Turbine
-Main Steam is not needed during normal operation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

What system normally controls the turbine speed?

A

-Normally controlled from Digital Feedwater Control System
-Can be manually control from control room

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

Where is turbine speed for startup overspeed testing controlled from ?

A

Controlled by an AO from a panel in the Subsynchrnous Resonance Room(SSR)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

What’re the 3 steam supply sources for the MFWP Turbine ?

A

-HP Steam
-LP steam
-Aux Steam

28
Q

When is HP Steam used for as a supply to MFWP Turbines ?

A

HP Steam is used during startup & to supplement LP system during light main turbine loads due to low pressure of hot reheat, OR overload on Feedwater pump turbine

29
Q

When is LP Steam used as a supply to the MFWP Turbine ?

A

Hot Reheat from ‘D’ MSR is used during normal operation

30
Q

When is Aux Steam used as a supply to MFWP Turbine ?

A

Used for MFWP Turbine overspeed testing during outage

31
Q

What is the FWPT overspeed trip setpoint ?

A

6350rpm

32
Q

What is the Feedwater Pump low suction pressure ?

A

245psig
‘A’ trips after 15 seconds
‘B’ trips after 10 seconds

33
Q

What is the Feedwater Pump high discharge pressure ?

A

1780psig is setpoint

34
Q

What is the Feedwater Pump/Turbine Bearing Low Oil pressure trip setpoint ?

A

4psig

35
Q

What is the trip setpoint for Exhaust Vacuum low ?

A

13.5”HgA

36
Q

What is the Thrust Bearing High trip setpoint ?

A

40psig

37
Q

What happens to the HP,LP Control & Stop Valves, & FWPT Mini flow valves when FWPT trip setpoint is reached ?

A

-HP & LP Stop & Control Valves go closed
-FWPT Mini-Flow valves go closed

38
Q

Where does MFWP Turbine exhaust to ?

A

Exhausts to A main condenser & is assisted by maintaining vacuum in condenser

39
Q

Where can LP Nitrogen be inserted into the MFWP Turbine exhaust ?

A

‘B’ MFWP Turbine has a connection to insert LP Nitrogen

40
Q

Why is LP Nitrogen added to ‘B’ MFWP Turbine Exhaust ?

A

Nitrogen helps purge oxygen & non condensable gases via Air Removal

41
Q

What do the Rotor & Bucket Wheels do for the MFWP Turbine ?

A

-Absorbs thermodynamic & kinetic energy & transform into mechanical energy

42
Q

What kind of shaft packing does the MFWP Turbine rotor have ?

A

Have labyrinth seals are used each end of Turbine Rotor to minimize leakage out of turbine casing

43
Q

Why is gland sealing steam used for the MFWP Turbine ?

A

Helps prevent steam leakage out of turbine casing & prevents air from getting in

44
Q

What does the Feedwater Pump Turbine Gear provide ?

A

Provides low speed turning of Turbine Rotor for:
-Cooling down turbine before complete shutdown
-Prestart rotation of rotor for steam is admitted

45
Q

What speed will the turning gear disengage ?

A

If rotor speed raises above 4rpm then turning gear will disengage

46
Q

What happens if Feedwater Pump/Turbine bearing oil pressure drops while turning heat is operating ?

A

-Pressure switches that’ll turn off turning gear during oil bearing pressure drop
-Pressure switches will prevent starting turning gear during low oil pressure to heating

47
Q

Where can the turning gear be operated from ?

A

-Normally operated from control room
-Can be operated locally, green indicating light on local panel shows if turning gear is in operation

48
Q

What does the FWPT Thrust Bearing Wear Device do ?

A

Will trip turbine if thrust bearing get to worn out

49
Q

What does the 3-key switch installed at local turbine panel do?

A

-Has one key that allows testing of Thrust Bearing wear trips during normal operation
-Key is normally in Thrust Wear Device switch

50
Q

What does he Thrust Wear Device Test Switch do ?

A

Has isolate/normal/ test , can only remove key if in test position & can then be used on two other thrust bearings

51
Q

How do the three positions on the Thrust Wear Device Test Switch work ?

A

ISOLATE- energizes solenoid valve that’ll isolate FWPT Thrust Wear Trip device
TEST-Enables active & inactive thrust wear test switches & turn on green lights
NORMAL-Enables two Thrust Wear Trip Devices

52
Q

How does the two position Active Thrust Wear Test Switch work ?

A

Key is removable in normal position only
-Normal position does nothing
-Test will test active thrust west device (Verified by green light on local panel)

53
Q

How does the Inactive Thrust Wear Test Switch work ?

A

Key is removable in normal position only
-Normal position does nothing
-Test position tests inactive thrust west device (Verified by green light on local panel)

54
Q

What does the Emergency (Overspeed) Governor do ?

A

During overspeed, emergency Governor will actuate tripping mechanism that’ll trip the stop valves & control valves closed to stop steam

55
Q

How does the Emergency(Overspeed) Governor work ?

A

-Uses centrifugal force to overcome spring force to unseat plunger
-When plunger throws out it’ll hit emergency trip mechanism & trip the turbine

56
Q

When is the Emergency (Overspeed) Governor tested ?

A

Tested during outage & trips at 110%overspeed

57
Q

What does the Lockout & Exerciser Switch(UNLOCK/LOCKOUT) do ?

A

-Allows to test overspeed test at power
-Lockout position disables the overspeed trio mechanism
-Unlock is normal position

58
Q

What does the key lock feature provide for the Local Lockout & Exerciser Switch ?

A

-Has capability to be locked in LOCKOUT position by shift manager
- Feature only uses for emergencies

59
Q

What does the Local Overspeed Trip Test Pushbutton do ? What indications do we have that overspeed trip signal worked ?

A

-When lockout & exerciser switch is in LOCKOUT, this button is pushed to activate overspeed exerciser to cause turbine trip signal
-A red “trip exercised” light will come on when trio mechanism is in position

60
Q

Why must there be caution when holding lockout position?

A

If switch goes back to UNLOCKED position while TRIP EXERCISED light is on the pump will actually trip

61
Q

How does loss of NK affect MFWP Turbine Operation ?

A

-Will lose ability to trip pump/turbine from control room
-Will have to trip pump locally at Turbine front standard

62
Q

How does loss of NN affect the operations of MFWP Turbine during operation ?

A

-Will cause MFWP Turbine control valve to drift close
-Will lose MFWP,but won’t cause an actual trip of the pump. Which then won’t cause a reactor power cutback

63
Q

What happens if you lose main steam, while you have insufficient ‘D’MSR hot reheat ?

A

MFWP will slow down causing low SG water level

64
Q

What happens if you just lose ‘D’ MSR Hot Reheat ?

A

You will have to run on main steam supplying the MFWP Turbine

65
Q

What happens to MFWP Turbine if you lose Feedwater Control system ?

A

Won’t be able to control pump speed, which could lead to reactor trip

Systems (62 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions