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Withers 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
Can the Backup PAC supply both units?
YES! If Isolation valves are closed
26
If you lose air to VRV-315/325 for the CR Ventilation, how will these valves fail?
Full flow to chillers
27
How much exhaust hood spray is there for U1?
138 gpm
28
How much exhaust hood spray is there for U2?
1200 gpm
29
What is minimum flow for a CBP?
4000 gpm
30
LP#1 heaters can provide how much flow capacity?
50% per string
31
LP 2-4 Htrs can provide how much flow capacity?
80% per string
32
CRV-224, LP Htr Bypass valve is good for how much flow?
20%
33
What is the purpose of CRV-224, LP Htr Bypass valve?
maintains NPSH for MFP
34
What are the loads for the TACW Pump?
Bus Duct Cooling Hydrogen Coolers Stator Water Coolers Exciter Coolers U1- Steam Packing Exhauster U2- Glad Steam Condenser
35
Where does TACW system tap off of the condensate system?
between hotwell pump discharge and XS Flow Line to CST
36
TACW in closed cycle does what to efficiency?
lowers
37
TACW in open cycle does what to efficiency?
raises
38
What cools the TACW Hx?
Circ Water
39
What is the normal water source for the MFP seal water pump?
CBP Discharge
40
What is the purpose of the MFP Seal water FRV?
maintains seal water leak off temp at 150*F
41
What is the MFPT motive force below ~ 60% power?
Main Steam
42
What is the MFPT motive force at full power?
Reheat Steam
43
What is the preferred order of water supplies to the AFPs?
CST Opp Unit CST Condensate Hotwells ESW
44
What does density compensation do for us in SGWLC?
Converts volumetric flowrate of steam to mass flowrate for input into the circuit
45
What causes SG Shrink? And where is the level measured?
reduction in steam flow, increase in SG pressure Seen in the downcomer
46
What causes SG Swell? And where is the level measured?
Increase in steam flow, lowering of SG Pressure Seen in the downcomer
47
What is the purpose of the SG PORVS?
Prevents lifting safeties to cooldown when dumps aren't available
48
How much steam flow is a PORV good for?
2.5%
49
What is the setpoint for the SG PORV?
Adjustable Normal is 1025#
50
What are the SG Safety set points?
2 @ 1065# 2 @ 1075# 1 @ 1085#
51
How much steam flow are SG safeties good for?
5.5% each 110% total
52
Can you close the SG Dump valves after a SLI?
Yes, take switch to lockout to prevent a release
53
How do the SGSVs fail on a loss of power to the dump valves?
Dump fails closed SGSV stays open
54
How do the SGSVs fail on a loss of air to the dump valves?
Dump fails open SGSV closes
55
Where are the rad monitors located for the SG monitoring system?
Downstream of PORVS
56
Is the rad monitor Operable if the PORV is isolated?
NO
57
Where do the reheater coil drains go?
6 heaters
58
Where do the Moisture separator drains go?
U1 5 heaters U2 4 heaters
59
Do the #6 heaters have alternate drains?
NO
60
Do the # 4 heaters have alternate drains?
NO
61
What are the purpose of bleed steam check valves?
prevent turbine overspeed
62
What is the only manual trip for Stator Cooling Water?
High conductivity at 18 mmhos
63
What should the temperature be of Stator water in comparison to hydrogen gas?
water is warmer 3-4* C warmer
64
What is the auto makeup for SCW?
Demin Water
65
What is the heat sink for SCW?
TACW
66
What will a loss of CCRP-3 do to SCW?
Blocks the high temp trip Block is removed 15 secs after power is restored
67
What is the flow set at for the SCW Deionizer and why?
100 gpm prevent channeling
68
What is used to purge air out of the generator?
CO2
69
What forces flow to generator condition monitor?
DP produced by the fans attached to the generator rotor
70
When will GSO-251 close and why?
50# and lowering to prevent H2 leak into turbine building
71
What are the U1 seal oil supplies in order? with Pressures.
MSOP 130# Emergency SOP 125# Shaft Driven Oil pump 120# Bearing Oil Hdr 25#
72
What is the purpose of the seal oil recirc pump?
retard foaming and aid in degassing
73
What will trip the U2 Seal Oil Vac Oil Pump?
Lo vac oil tank level
74
What will trip the U2 Seal Oil Vac Pump?
Hi vac oil tank level
75
What is the purpose of 2-LRV-608 air oil pressure reg valve?
keeps air oil pressure 7# greater than generator gas pressure
76
How much higher in pressure is Vac oil and H2 oil pressure than air oil?
6# greater
77
When does the U1 turning gear engage?
When the turbine stops
78
What is the U1 #2 stop valve used for?
chest warming
79
Which oil pump will be running in U1 immediately after a Turbine Trip?
All except bearing lift pumps
80
Why would the U2 knife switches be opened when the reactor is tripped?
prevent overspeed to allow the turbine to stay on grid
81
Why do reheat stop and intercept valves close on a main turbine trip?
Prevent overspeed
82
What is the purpose of the Main Turbine Thurst Bearing?
Prevents stationary and rotating blade contact
83
When does the U2 main turbine go on it's turning gear?
when turbine speed is <40 RPM
84
What supplies U2 Steam seals to the HP Turbine inner seals?
Main Steam
85
How much higher are HP Turbine inner steam seals than HP Turbine exhaust?
10#
86
What supplies U2 steam seals at low power, startup and shutdown?
Aux Steam

Withers Stack (86 decks)

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