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Trybula Stack > Important Secondary Shit > Flashcards

Important Secondary Shit Flashcards

1
Q

How do the starting air valves fail due to a loss of CA on the EDG?

A

As Is

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2
Q

What happens if the EDG electronic governor fails High?

A

Speed will rise until the mechanical governor takes over

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3
Q

What are the 1KV Inverter loads for the EDG?

A

Speed Transmitters

Bear Temp Monitor

Field Flash Power

Local/Remote control Transfer Relays

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4
Q

Why is the EDG INOP during surveillance testing?

A

It will not generate a Loadshed signal

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5
Q

How will the EDG Throttle control cylinder fail on loss of CA?

A

Extended, forcing the fuel racks closed

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6
Q

What order do the EDG fans start on an EDG start?

A

Exhaust fan starts immediately

Supply fan has a 20 sec delay

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7
Q

What stops the EDG Ventilation fans?

A

30 mins after EDG stops

70*F Room Temp

CO2 Actuation

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8
Q

What supplies the EDG with fuel oil during operation?

A

Shaft driven pump

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9
Q

When do the upper valve gear lube oil valves open for the EDG?

A

On the start signal

2 mins every 4 hrs in Sby

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10
Q

When does the EDG Jacket water pump start?

A

on run relay (95% speed)

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11
Q

What are the Circ Water support systems?

A

250 VDC

MSCW

Screen Wash

Vac Priming

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12
Q

Does the CW Pump discharge valve change position automatically?

A

Only on an auto start or breaker opening

Manual starts require manual valve manipulations

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13
Q

What is the De-Icing flowpath?

A

WMO-16 or 26 Open

WMO-30 Closed

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14
Q

Can a NESW Pump be restarted after a loadshed?

A

Yes, by going to lockout after 75 secs

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15
Q

If you lose CA, do MAC valves has backup air bottles?

A

No

They close immediately

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16
Q

What are the suction sources for the NESW Pump in order of preference?

A
  1. Circ Water Suction (own and opp)

2. Discharge Tunnels (own and opp)

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17
Q

Where does CA come from to the ESW Strainers for backwash?

A

Unit 1 supplies both Units

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18
Q

Is there auto makeup to the CCW Surge Tank?

A

No auto signal

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19
Q

What is the makeup to the CCW Surge Tank?

A

Demin Water

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20
Q

What are the ESF Loads for CCW?

A 
RHR hx
RHR pp Seal Hx
CTS pp Seal Hx
SI pp Seal Hx
SI LO cooler
CCP LO cooler
CCP Speed Increaser
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21
Q

What is the biggest Misc Hdr load for CCW?

A

SFP Hx

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22
Q

What are the pressures for compressed air system actions?

A

97# PAC Opp Unit PAC starts

90# CAC Starts

85# PA Hdr Iso Valve Close

80# Manual Rx Trip

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23
Q

Where is the 90# sensed to start the CAC?

A

wet air receiver pressure

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24
Q

PAC air flowpath for control air?

A

Pac ==> Plant Air Receivers ==> Control Air

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25
Q

Can the Backup PAC supply both units?

A

YES! If Isolation valves are closed

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26
Q

If you lose air to VRV-315/325 for the CR Ventilation, how will these valves fail?

A

Full flow to chillers

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27
Q

How much exhaust hood spray is there for U1?

A

138 gpm

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28
Q

How much exhaust hood spray is there for U2?

A

1200 gpm

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29
Q

What is minimum flow for a CBP?

A

4000 gpm

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30
Q

LP#1 heaters can provide how much flow capacity?

A

50% per string

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31
Q

LP 2-4 Htrs can provide how much flow capacity?

A

80% per string

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32
Q

CRV-224, LP Htr Bypass valve is good for how much flow?

A

20%

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33
Q

What is the purpose of CRV-224, LP Htr Bypass valve?

A

maintains NPSH for MFP

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34
Q

What are the loads for the TACW Pump?

A

Bus Duct Cooling

Hydrogen Coolers

Stator Water Coolers

Exciter Coolers

U1- Steam Packing Exhauster

U2- Glad Steam Condenser

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35
Q

Where does TACW system tap off of the condensate system?

A

between hotwell pump discharge and XS Flow Line to CST

36
Q

TACW in closed cycle does what to efficiency?

37
Q

TACW in open cycle does what to efficiency?

38
Q

What cools the TACW Hx?

A

Circ Water

39
Q

What is the normal water source for the MFP seal water pump?

A

CBP Discharge

40
Q

What is the purpose of the MFP Seal water FRV?

A

maintains seal water leak off temp at 150*F

41
Q

What is the MFPT motive force below ~ 60% power?

A

Main Steam

42
Q

What is the MFPT motive force at full power?

A

Reheat Steam

43
Q

What is the preferred order of water supplies to the AFPs?

A

CST

Opp Unit CST

Condensate Hotwells

ESW

44
Q

What does density compensation do for us in SGWLC?

A

Converts volumetric flowrate of steam to mass flowrate for input into the circuit

45
Q

What causes SG Shrink? And where is the level measured?

A

reduction in steam flow, increase in SG pressure

Seen in the downcomer

46
Q

What causes SG Swell? And where is the level measured?

A

Increase in steam flow, lowering of SG Pressure

Seen in the downcomer

47
Q

What is the purpose of the SG PORVS?

A

Prevents lifting safeties to cooldown when dumps aren’t available

48
Q

How much steam flow is a PORV good for?

49
Q

What is the setpoint for the SG PORV?

A

Adjustable

Normal is 1025#

50
Q

What are the SG Safety set points?

A

2 @ 1065#
2 @ 1075#
1 @ 1085#

51
Q

How much steam flow are SG safeties good for?

A

5.5% each

110% total

52
Q

Can you close the SG Dump valves after a SLI?

A

Yes, take switch to lockout to prevent a release

53
Q

How do the SGSVs fail on a loss of power to the dump valves?

A

Dump fails closed

SGSV stays open

54
Q

How do the SGSVs fail on a loss of air to the dump valves?

A

Dump fails open

SGSV closes

55
Q

Where are the rad monitors located for the SG monitoring system?

A

Downstream of PORVS

56
Q

Is the rad monitor Operable if the PORV is isolated?

57
Q

Where do the reheater coil drains go?

58
Q

Where do the Moisture separator drains go?

A

U1 5 heaters

U2 4 heaters

59
Q

Do the #6 heaters have alternate drains?

60
Q

Do the # 4 heaters have alternate drains?

61
Q

What are the purpose of bleed steam check valves?

A

prevent turbine overspeed

62
Q

What is the only manual trip for Stator Cooling Water?

A

High conductivity at 18 mmhos

63
Q

What should the temperature be of Stator water in comparison to hydrogen gas?

A

water is warmer

3-4* C warmer

64
Q

What is the auto makeup for SCW?

A

Demin Water

65
Q

What is the heat sink for SCW?

66
Q

What will a loss of CCRP-3 do to SCW?

A

Blocks the high temp trip

Block is removed 15 secs after power is restored

67
Q

What is the flow set at for the SCW Deionizer and why?

A

100 gpm

prevent channeling

68
Q

What is used to purge air out of the generator?

69
Q

What forces flow to generator condition monitor?

A

DP produced by the fans attached to the generator rotor

70
Q

When will GSO-251 close and why?

A

50# and lowering

to prevent H2 leak into turbine building

71
Q

What are the U1 seal oil supplies in order? with Pressures.

A

MSOP 130#

Emergency SOP 125#

Shaft Driven Oil pump 120#

Bearing Oil Hdr 25#

72
Q

What is the purpose of the seal oil recirc pump?

A

retard foaming and aid in degassing

73
Q

What will trip the U2 Seal Oil Vac Oil Pump?

A

Lo vac oil tank level

74
Q

What will trip the U2 Seal Oil Vac Pump?

A

Hi vac oil tank level

75
Q

What is the purpose of 2-LRV-608 air oil pressure reg valve?

A

keeps air oil pressure 7# greater than generator gas pressure

76
Q

How much higher in pressure is Vac oil and H2 oil pressure than air oil?

A

6# greater

77
Q

When does the U1 turning gear engage?

A

When the turbine stops

78
Q

What is the U1 #2 stop valve used for?

A

chest warming

79
Q

Which oil pump will be running in U1 immediately after a Turbine Trip?

A

All except bearing lift pumps

80
Q

Why would the U2 knife switches be opened when the reactor is tripped?

A

prevent overspeed to allow the turbine to stay on grid

81
Q

Why do reheat stop and intercept valves close on a main turbine trip?

A

Prevent overspeed

82
Q

What is the purpose of the Main Turbine Thurst Bearing?

A

Prevents stationary and rotating blade contact

83
Q

When does the U2 main turbine go on it’s turning gear?

A

when turbine speed is <40 RPM

84
Q

What supplies U2 Steam seals to the HP Turbine inner seals?

A

Main Steam

85
Q

How much higher are HP Turbine inner steam seals than HP Turbine exhaust?

86
Q

What supplies U2 steam seals at low power, startup and shutdown?

Trybula Stack (84 decks)

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