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Systems > Condensate Transfer and Storage & Aux Feedwater > Flashcards

Condensate Transfer and Storage & Aux Feedwater Flashcards

1
Q

What is design basis for Condensate Transfer & Storage system ?

A

-Initial fill for Condensate & FW system
-Help maintains level in Condenser hot wells
-Provide water for CD Demins for resin regeneration
-Backup water to Spent Fuel Pool
-Emergency makeup for EW,EW, & DG Jacket Water Surge Tanks

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2
Q

Why is the CST Tank reinforced with concrete ?

A

-Needs to meet seismic category 1 requirements to be functional during safe shutdown
-Protects against tornado borne missiles

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3
Q

What is 300,000 gallons of water dedicated to inside the CST Tank ?

A

-To use Aux. FW system and provide FW to maintain plant in hot standby for 8 hours
-Allows controlled plant cooldown at max rate of 75F/hr to shutdown cooling is initiated

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4
Q

What is the other 220,000 gallons dedicated for inside the CST Tank ?

A

-Dedicated to 3 days of normal makeup to Condensate & FW systems
-Used by Secondary Chemistry Control system without replenishment from DW

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5
Q

How are the penetrations into the CST Tank arranged ?

A

-Essential operations is everything below the 300,000 gallons
-Non-Essential has penetration above the 300,000gallons

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6
Q

What is the normal makeup to the CST ? How is it done ?

A

-DW is normal makeup and is normally done automatically based on CST lvl
-Makeup line has a bypass line that can be used when level control balance is isolated

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7
Q

What is the backup makeup water to the CST ? Why is this makeup water supply not normally used ?

A

-Recycled Monitor Tanks is backup makeup source to CST
-Not normally used because it can potentially be contaminated

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8
Q

What cover gas is used for the CST Tank ? How is regulated ?

A

-Nitrogen gas is used
-Regulated to 3.5 psig by a PCV
-Bypass line can be used when PCV is isolated

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9
Q

What’re the two breather valve used for?

A

-One breather valve is used pass nitrogen from atmosphere from failed open nitrogen supply line
-Other breather valve allows air into CST to prevent vacuum during Main Condenser Hotwell Makeup

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10
Q

What is the purpose for Tank Overflow & Loop Seal line ?

A

-Loop seal prevents nitrogen from leaking out
-Overflow is directed to north condenser sump

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11
Q

Why should the CST inventory not be <40F & >120F ?

A

-<40F precludes thermal shock to SGs
->120F is upper limit of design calculations

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12
Q

What is the primary supply line for the FLEX SG Makeup Pump ?

A

Pump draws from CST Drain Line

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13
Q

Where is the valve located that is used to align the FLEX SG Makeup Pumps used for ?

A

The valve to align is located in CST Drain Pit

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14
Q

What conditions must the CST Drain out be maintained in ?

A

CST Drain pit must be maintained locked by Operations & Security departments

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15
Q

What’re pre-requisites to placing CST in Normal Operation ?

A

-DW available
-LP Nitrogen is available

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16
Q

Where do the Condensate Transfer Pumps supply makeup water to ?

A

-DG Jacket Water Storage Tanks
-EC Surge Tanks
-EW Surge Tanks
-Spent Fuel Pool

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17
Q

Is there expected to be leakage from the Condensate Transfer Pumps ?

A

-Some leakage is expected both during operation & while secured
-Leakage will fall to pump skid and directed to floor drain

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18
Q

Where do the Condensate Transfer Pump recirc. lines discharge to ?

A

Recirc. lines will discharge back into CST from associated Train Aux FW Pump Recirc. Lines

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19
Q

Where are the Condensate Transfer Pumps powered from ?

A

Powered from class 480MCC (PH)

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20
Q

What ESFAS signals auto start the Condensate Transfer Pumps ?

A

-LOP (Train Specific)
-SIAS
-CREFAS
-CRVIAS

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21
Q

What do the CST Suction Isolation Valves to the ‘N’ Aux FW Pump do ?

A

Provides isolation for CST & Seismic break between Seismic Category 1 & Seismic Category 2 rated supply line

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22
Q

What conditions are the CST Suction Isolation Valves usually in ?

A

They’re normally closed

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23
Q

How are both of the CST Suction Isolation Valves interlocked with ‘N’ Aux Fw Pump ?

A

Provides low suction pressure protection

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24
Q

What position must the CST Suction Isolation Valves be in to start and run the pump ?

A

-Both valves must be >80% open
-If one valve drops below 80% open it will trip the ‘N ‘ Aux FW Pump

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25
Q

Where are the ‘N’ Aux FW Pump suction isolation valves powered from ?

A

They’re BOTH powered from ‘A’ train

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26
Q

Which condenser hotwell does CST provide makeup water for ?

A

‘A’ Main Condenser Hotwell Halves

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27
Q

What controls the makeup to the ‘A’ Main Condenser hotwell ?

A

Makeup is controlled by ‘C’ Main Condenser Hotwell half level

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28
Q

When is condensate rejected from the Main Condenser ?

A

High lvl in ‘C’ condenser will open Condenser Hotwell Draw Off Level Control Valve and return it to CST

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29
Q

What is the most common use of the CST system ?

A

-CST is used for Condensate Demins

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30
Q

What do the Regenerate Water Transfer Pumps in Secondary Chemistry control system used for ?

A

Transfers water from CST to Condensate Demins during regen process to:
-Trasnfer resin between vessels
-Rinse vessels after resin is transferred
-Dilute acid and concentration during chemical cleaning of cation resin
-Backwash resin
-Fill service vessel after transferring resin back into them

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31
Q

What’s status are the CST pumps during normal operation ?

A

-Condensate pump are normally in standby
-If makeup water is needed then Control Room can manually start it

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32
Q

How does Essential Lighting interface with CST ?

A

QB provides lighting for CST Pump House

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33
Q

How many CST gallons is designated for a controlled shutdown & cooldown ?

A

300,000 gallons designated to supply Essential Aux FW Pumps

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34
Q

What should CST level be ?

A

> 29.5 ft

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35
Q

What should CST have sufficient cooling for?

A

-Must have sufficient cooling to remove decay heat for 4hrs following reactor trip from 102%
-Then cooldown RCS for Shutdown Cooling entry conditions

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36
Q

Why must there be a volume of 300,000 gallons ?

A

This 300,000 gallons will hold unit in mode 3 for 8 hours followed by cooldown to SDC entry conditions at 75F per hour

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37
Q

What is the design basis for Aux. Feedwater system?

A

-Provide flow for RCS temp. during Normal startup, hot standby, & shutdown conditions
-Supports orderly ,controlled shutdown & cooldown of reactor
-Used to remove decay heat from RCS during Station Blackout

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38
Q

What are the UFSAR Design Bases ?

A

-RCS cooldown at max rate of 75F per hour to 350F during LOOP
-Hot standby for 8hours during LOOP
-RCS cooldown using SG following main steam line break,or Main FW Break inside containment during LOOP

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39
Q

When does ‘N’ Aux FW Pump deliver Feedwater to Steam Generator ?

A

-During normal startup, Hot Standby, & Shutdown conditions
-Also provides chemically treated water to SG for initial fill

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40
Q

How are the ‘N’ Aux FW motor & pump bearings lubricated ?

A

Bearings are self lubricated using slinger rings to throw oil on bearings

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41
Q

How are the ‘N’ Aux FW Pump motor bearings cooled ?

A

Motor bearings cooled by shaft mounted fan

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42
Q

How is the ‘N’ Aux FW Pump bearings cooled?

A

-Pump bearings cooled with discharge of pumps 1st stage through integral oil cooler
-After 1st stage cools bearings it’s then sent back to suction of pump

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43
Q

Where is the ‘N’ Aux FW Pump powered from ?

A

Powered from 4.16kv PBA-S03

44
Q

What’re the two class control power sources for main break operation for the ‘N’ AF Pump ?

A

-Normal source is: PKA-D21
-Alternate source is: ‘A’ Class Battery Charger PKA-H11

45
Q

How do you select a control power source for the ‘N’ AF Pump ?

A

A 3 position switch for Control Power Transfer Switch for ‘N’ AF Pump

46
Q

What does ‘N’ AF Pump do during normal startup ?

A

-Provides FW to steam generator until power reaches 2%, then Main FW pump will start
-Also used for SG chemistry by injecting ammonia & hydrazine at suction of pump

47
Q

What’re the two suction isolation valves provide for ‘N’ AF Pump ?

A

-Provide protection from low suction pressure condition
-Interlocked with pump if valves less than 80% open it will trip pump

48
Q

What ESFAS Signal will trip the ‘N’ AF Pump ?

A

-SIAS
-LOP

49
Q

What is the different between ‘N’ AF Pump & ‘B’ AF Pump ?

A

Difference is ‘B’ AF Pump has:
-Seismic category 1 requirements
-Larger horsepower motor
-Delivers 650gpm to intact SG @1270psia

50
Q

What is the power supply for ‘B’ AF Pump ?

A

Power supply is 4.16kv PBA-S04

51
Q

What is the normal water supply to the ‘B’ AF Pump ?

A

CST supplies water to pump through normally locked open valve

52
Q

What water supply is used when CST isn’t available for ‘B’ AF Pump?

A

RMWT is backup, this is done by unlocking & closing normal water supply from CST & opening normally closed water supply valve

53
Q

What will automatically start ‘B’ AF Pump ?

A

-AFAS 1/2
-CSAS
-SIAS
-‘B’ Train LOP

54
Q

What else will start in the same room when ‘B’ AF pump starts?

A

Essential ACU will start for pump operability

55
Q

What’re pre/post start checks for ‘B’ AF Pump ?

A

-Oil levels
-Leakage
-Physical obstructions
-abnormal conditions
-Oil Temperature

56
Q

What is different about ‘A’ AF Pump ?

A

Doesn’t need AC power to operator because it’s steam driven

57
Q

Why does ‘A’ AF Pump provide reliability ?

A

Provides reliability during Blackout and is capable of deliver water to SG at different flow rates & pressures,as the RCS cools down to SDC entry

58
Q

Where does the steam used to drive ‘A’ AF Pump exhaust to ?

A

Exhaust out to atmosphere, instead of a condenser

59
Q

Where does ‘A’ AF Pump turbine receive its steam from ?

A

-Receives steam from BOTH steam generator main steam lines

60
Q

When will ‘A’ AF Pump automatically start ?

A

Will start on AFAS and will auto open Main Steam Supply Valves & bypass valves

61
Q

When would we use Aux. Steam to drive ‘A’ AF Pump ?

A

-Testing
-Performance of standard appendix

62
Q

What is the Governor on the ‘A’ AF Pump used for ?

A

Used to regulate steam control valve to control speed of turbine, and therefore the pump

63
Q

What does the Governor consist of ?

A

-Automatic control box
-Manual Speed Potentiometer
-Hydraulic Actuator
-Governor Valve

64
Q

What does the Governor control box do ?

A

Control box senses shaft speed & sends control signal to Hydraulic actuator (EGR)

65
Q

What is the Governor EGR used for ?

A

Uses system oil to position Governor Valve

66
Q

What does the Governor Valve do ?

A

It regulated steam going into the turbine

67
Q

What is the Governor Potentiometer used for ?

A

Used to manually control this process

68
Q

Where is the Governor powered from ?

A

Powered from Class 125VDC Control Power (PKA-D21)

69
Q

What will happen to the ‘A’ AF Pump if governor loses control power ?

A

The governor fails open which causes turbine to trip on overspeed

70
Q

Where is the Oil Pump attached to on the ‘A’ AF Pump?

A

Oil pump coupled to a worm gearbox driven by the AF Turbine Shaft

71
Q

Where does the Oil Pump supply oil to ?

A

Supplied oil to Turbine bearings & to Turbine Hydraulic Actuator (EGR)

72
Q

What does the ‘A’ AF Pump oil cooler used for ? Where does it get its cooling water from ?

A

-Oil cooler maintains oil temp
-Receives cooling water from 1st stage of AF Pump,discharges water back to suction of pump

73
Q

What happens when the Governor control system cartridge filter gets clogged ?

A

Has a dirt alarm that’ll bypass filter when it gets clogged

74
Q

What is the eight glass used for on the ‘A’ AF Pump ?

A

Sight glass on each end of turbine to indicate oil level

75
Q

What’re are the Min. Operating Speed & Min. Sustained Speed ?

A

Min. Operating Speed-800rpm
Min. Sustained Speed- 1000rpm

76
Q

Why is operating ‘A’ AF Pump with speed less than 1000 rpm, greater than 5 minutes prohibited ?

A

Operating below 1000rpm doesn’t allow adequate Oil Pressure & Cooling Water to Oil Cooler

77
Q

Where can the ‘A’ AF Pump be operated from ?

A

-Control Room
-May be operated locally for testing or during Emergency Operating Procedures

78
Q

How is the ‘ A’ AF Pump operated WITH & WITHOUT control power ?

A

-With control power available: indications & controls on local control panel are used
-Without control power available:
Manually throttle steam to turbine
Opening isolation valves to each SG
Throttling regulating valve to control discharge pressure

79
Q

What happens if the overspeed mechanism actuates for the ‘A’ AF Pump ?

A

Overspeed will trip the Trip Throttle Valve stopping steam supply to turbine

80
Q

What is the normal supply water to the ‘A’ AF Pump ? What is alternate water supply ?

A

-CST provides water to ‘A’ AF Pump through normally locked open valve
-Alternate supply is from RMWT, unlocked and close valve. Then open RMWT valve

81
Q

What else will start with the ‘A’ AF Pump ?

A

Essential ACU

82
Q

Why is it important for the ‘A’ AF pump to receive steam upstream of the MSIV’s ?

A

Ensures steam for ‘A’ AF pump during Main Steam Isolation Signal

83
Q

What is the 1in steam supply valves used for on the ‘A’ AF Pump ?

A

-1in stems supply line will get the AF turbine up to speed(1000rpm)
-Allows oil pressure to increase for Governor to control steam
-Provides pressure for 1st stage cooling water to oil cooler

84
Q

When does the 6in Steam Supply Valves open to the ‘A’ AF Pump ?

A

-30seconds after 1in line is opened, the 6in line will open to admit full steam
-Governor will now be in control of speed

85
Q

What’re the Critical steam traps in the supply lines to the ‘A’ AF Pump used for ?

A

They’re used to remove condensate from supply lines to the ‘A’ condenser just above condenser reheat trays

86
Q

What happens if the condenser reheat trays flood into the Steam Trap line ?

A

-Steam traps won’t remove moisture in lines
-If moisture reaches AF Turbine it could overspeed the turbine

87
Q

What is the Condensate Pot used for ?

A

-Used to drain moisture from critical steam trap supply line
-Collects drainage & leakoff from trip throttle valve

88
Q

What would happen if we didn’t have Condensate Pot ?

A

-Would greatly increase chances of overspeed trip
-Overspeed challenges the design function of fast starts from cold condition

89
Q

How do the two thermostatic vent valves work on the Condensate Drain Pot ?

A

-When AFA pump is started some steam will release, but vent valves will close after they’ve been heated up
-Vent valves have a bellows

90
Q

What happens to AFA Pump if vent valves or steam/floats traps aren’t a operating correctly ?

A

AFA Pump will not be operable if these things aren’t operating

91
Q

What is the Trip Throttle Valve used for ?

A

-During normal operation is used as a trip valve
-Throttles steam flow if control power is lost to Governor

92
Q

Where can the AFA Pump MOV in the steam supply line be operated from ?

A

-B06 in Control Room
-‘A’ Remote Shutdown Panel
-Local Control Panel in AFA room

93
Q

What do the red & green lights indicate on the local control panel ?

A

-Green for closed/red for Open
This is for BOTH:
-Trip Throttle Valve Operator
-Trip & Throttle Valve

94
Q

When would the Trip Throttle Valve be operated manually ?

A

This will be done when starting up AFA Pump, this is performed for testing or Emergency Operating Procedures

95
Q

What will trip the Trip Throttle Valve closed ?

A

A mechanical overspeed or a electrical protection signal

96
Q

What controls regulating valves to open or close?

A

Regulating valves open and close based on SG level between 25.8% & 40.4%

97
Q

What will ESFAS auto open the Regulating Valves & Isolation Valves ?

A

Both valves will open upon a AFAS

98
Q

Where can regulating & isolation valves be operated from ?

A

-Control room
-Remote shutdown panel
-Locally at valves

99
Q

Where is AFA Pump discharge regulating and isolation valves powered from ?

A

Powered from Class 125VDC from buses PKA & PKC

100
Q

Where is AFB Pump discharge Regulating & Isolation Valves powered from ?

A

Powered from Class 480VAC MCC

101
Q

Why does the ‘N’ AF Pump not have any dedicated regulating or isolation valves ?

A

It uses the Feedwater Downcomer line stop valves and control valves

102
Q

Why is there multiple isolation barriers at the discharge of the AF Pumps ?

A

This is to prevent back flow of Feedwater which could cause steam to form at AF Pump and while starting the pump can steam bind it

103
Q

What device do you we use at the AF Pump Discharge piping to identify if there is any steam formation at pipe?

A

We use a temperature plate recorder that’ll change color to identify if there is steam at the AF Pump

104
Q

How do we know if gas binding has occurred ?

A

AF Pump doesn’t develop discharge pressure or flow

105
Q

What does filling and venting the AF Pump do ? What happens to AF pump when filling & venting ?

A

Fill & vent pump with CST water & this process makes AF Pump inoperable

106
Q

What is a differential pressure lockout ? What causes it ?

A

-Differential pressure between SGs is 185psid
-This indicated a Main Steam Line Break or Feedwater Line Break affecting SG with lowest pressure

107
Q

What happens during a Differential Pressure Lockout ?

A

Closes regulating valves & isolation valve & prevent them from reopening

Systems (62 decks)

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