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Systems > SFP Cooling & Cleanup > Flashcards

SFP Cooling & Cleanup Flashcards

1
Q

What is the SFP used for ?

A

-Stores spent fuel after it’s removed from Reactor
-Shields radiation
-Ensures fuel is stored in configuration that will allow mass to become critical

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2
Q

What does SFP inventory provide ?

A

-Adequate shielding for plant personnel from spent fuel
-Adequate decontamination of noble gases following postulated fuel handling accident
-Adequate NPSH Fuel Pool Cooling Pumps
-Reserve volume of borated water

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3
Q

What’re Aluminum-boron carbide metal matrix composite inserts used for in the SFP Fuel Storage ?

A

Installed in designated fuel cell locations to suppress SFP reactivity through neutron absorption to prevent SFP from going critical

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4
Q

What does the SFP Fuel Storage arrangement do ?

A

-Prevents extensive bulk boiling -Prevents peak clad temp from exceeding 650F

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5
Q

How much storage for fuel assemblies does the SFP have ?

A

Can store up to a maximum of 1205 assemblies

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6
Q

How many gallons water does SFP hold ?

A

-Holds approx. 340,000 gallons of borated water(138’)

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7
Q

What is the SFP Tech Spec for boron concentration ? What is administrative TRM boron concentration ?

A

Tech Spec- 2150ppm
Administrative TRM- 4000-4400PPM

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8
Q

Why is our Administrative TRM for boron concentration of SFP 4000-4400PPM?

A

-SFP is used as alternate source of borated water for Emergency Boration of RCS via CVCS

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9
Q

What’re the 4 ways of monitoring Spent Fuel Pool level ?

A

-Yard Stick
-SFP Control Panel
-Milltronics Ultrasonic Level system
-FLEX level indication

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10
Q

How does the Yard Stick for SFP Level monitoring work ?

A

-Mounted on inside of SFP for local monitoring
-Camera is pointed at it so Control Room can see

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11
Q

What is the SFP Control Panel ?

A

Local control panel with high & low level alarms that’ll alert operators a change in SFP level as well as annunciate a trouble alarm Control Room

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12
Q

What is the Milltronics Ultrasonic Level System ?

A

-Ultrasonic level detection & indicating system installed to monitor SFP
-Two level detectors installed along plant north wall of SFP
-Each one has a dedicated readout installed on side of Local Control Panel

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13
Q

For Milltronics Ultrasonic Level System how does main display indication for SFP level ?

A

-Indicated SFP level in feet as a decimal number

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14
Q

What’re the what does the signal on left side of display indicate ? (A symbol with top & bottom brackets)

A

Indicates normal operation of system

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15
Q

What does it mean when the symbol doesn’t have bottom or top bracket?

A

Indicates that transceiver is in Fail-Safe and non functional for use

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16
Q

What does vertical bar on right side of display for Milltronics Ultrasonic Level System indicate ?

A

Indicates level in %, with 0% being the top of the fuel racks at 113.5’ & 100% being at 138.5’

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17
Q

What will should do next to the bar on the right side of the display screen for Milltronics Ultrasonic Level System ??

A

-When level alarm is activated a up or down arrow will be next to bar graph
-A LO-LO level I’ll display two down arrows

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18
Q

How do the circles at bottom of display for Milltronics Ultrasonic Level System ?

A

PCN-LIT-0003 has two contacts:
#1 contact for High lvl alarm @138.17’
#2 contact for Low lvl alarm @137.5’
PCN-LIT-0005 has one contact:
#1 contact is for LO-LO lvl alarm @137’

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19
Q

What kind water is used for SFP Makeup ? What is normal makeup to SFP ?

A

-Can come from borated or non borated water sources
-Normal makeup to SFP is unborated source

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20
Q

What’re the unborated makeup water sources to the SFP ?

A

-LRS Recycle Monitor Tank (Normal makeup source, due to evaporation)
-Condensate Transfer Tank (Backup makeup sources due to evaporation)
-Reactor Makeup Water Tank(RMWT)
-Demineralized Water(DW)

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21
Q

What is the Borated Makeup Water sources to SFP ?

A

-Refueling Water Tank
Used to fill other pools:
-Refueling Pool, Transfer Canal, Cask Load Pit

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22
Q

What’re Beyond Design Basis Makeup sources for the SFP ?

A

FLEX modifications are available to add either Fire Protection or Circulating Water to SFP via Hoses,Fire Trucks, installed spray nozzles above SFP

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23
Q

What’re the Spent Fuel Pool Gate Seals used for ?

A

-Separates SFP from Cask Load Pit & Fuel Transfer Canal
-A gate separates Cask Load Pit from Decontamination Pit

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24
Q

What does SFP Gate Seals allow Cask Load Pit & Transfer Canal ?

A

Allows Cask Load Pit & Transfer Canal to be drained while not affect SFP LVL

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25
Q

What kind of seals do the SFP Gate Seals have ?

A

All SFP gates have TWO Q-Class bladder seals:
-One ‘A’ train seal
-One ‘B’ train seal

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26
Q

Why are the Gate Seals redundant with a ‘A’ & ‘B’ train seal ?

A

-Loss of ONE seal will not allow any leakage past gate

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27
Q

What’re the Seal Bladders normally pressurized from? What is used as a backup pressurization method for Seal Bladders ?

A

-Normally pressurized by Instrument Air at 42psig
-Pressurized by two class nitrogen bottles at 38psig

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28
Q

When are the Class Nitrogen bottles automatically put into service for pressurizing seal bladders ?

A

Check valve separates two supply headers, if Instrument supply header drops to 38psig then nitrogen bottles automatically take over

29
Q

What happens if nitrogen bottles become insufficient,unavailable, or inaccessible ?

A

There is a FLEX connection to install backup nitrogen bottles on plant north end

30
Q

What must be matched prior to removing gate ?

A

Water level & boron concentration between two sides must be matched

31
Q

How do you match water level between SFP & Transfer canal, since transfer canal doesn’t have level indication ?

A

-AOs count gate ribs to determine level on each side
-Then

32
Q

What is the concern for Transfer Canal being raised above 138.25’ 3” ?

A

Could spill over into the New-Fuel Elevator Cable tray & damage electric motor for New-Fuel Elevator

33
Q

What is the SFP concern for filling it above 138’ 3”?

A

If SFP Transfer Canal Gate is removed then it could damage motor for New Fuel Elevator Cable Tray

34
Q

What happens if Refueling pool level is above 138’ 2”?

A

May introduce water to In-Core-instrument tubing shield resulting in admission of borated water in ICI chase area

35
Q

What should the Fuel Storage Pool Water Level be during movement of Fuel Assemblies ?

A

Fuel Storage Pool Water Level shall be >23ft over top of Fuel Assemblies seated in storage racks

36
Q

What should the Fuel Storage Pool Boron Concentration be ANYTIME a Fuel Assembly is inside pool ?

A

Fuel storage pool boron concentration shall be >2150ppm

37
Q

What borated sources should be functional during shutdown? (A minimum of ONE shall be functional)

A

As a minimum either SFP or RWT shall be FUNCTIONAL during shutdown in MODES 5&6

38
Q

What’re the requirements for SFP to be considered FUNCTIONAL ?

A

-SFP temp >60F & <180F
-Boron concentration is >4000 & <4400ppm
-Volume of borated water source is >33,500 gallons

39
Q

What’re the Borating sources during operation that have to be functional?

A

-SFP shall be FUNCTIONAL in modes 1-4

40
Q

What’re boron injection flow paths that shall be FUNCTIONAL during shutdown? (A minimum of ONE shall be functional to meet TLCO)

A

-A flow path from SFP via a gravity flow connection to charging pump to the RCS
-Flow path from RWT via either w Charging Pump,HPSI,or LPSI to the RCS

41
Q

What’re following requirements for boration flow paths to be considered functional during Shutdown ?

A

Each valve in flow path that isn’t locked,sealed, or secured in position, is in its CORRECT position

42
Q

What is the Fuel Transfer Tube used for ?

A
43
Q

What do the inner & outer pipe act as for the Fuel Transfer Tube ?

A

Inner Tube- Acts as refueling tube
Outer Tube- Acts as housing

44
Q

How is the Fuel Assembly maneuvered as it’s being sent through Fuel Transfer Tube?

A

1.)Placed vertically on Transfer Carriage
2.)Lowered to horizontal position
3.)Move through Fuel Transfer Tube on Transfer Carriage via when & track system
4.) Then restored to vertical position

45
Q

How many Fuel Assemblies are permitted to transfer through Fuel Transfer Tube ?

A

Only one irradiated Fuel Assembly is permitted

46
Q

What is used to prevent leakage from Transfer Canal to Refueling Pool ?

A

Tube is fitted with double-gasketed blind flange

47
Q

At least 2 of 3 boron injection flow paths shall be functional during operation, what’re they ?

A

1.) Gravity feed from either RWT or SFP, through valve 536 & charging pump to the RCS
2.)Gravity feed from RWT through valve 327 & a charging pump to RCS
3.)Flow path from either RWT or SFP through 164 utilizing gravity feed & Charging Pump to RCS

48
Q

What is the Fuel Transfer Tube Canal Isolation Valve used for?

A

Used to isolate Transfer Canal from Fuel Transfer Tube

49
Q

Where is the manual hand wheel at for the Fuel Transfer Tune Canal Isolation Valve ? How many turns is this isolation valve ?

A

-Maintained in High Risk Area of SFP for operation of V118
-700+ turns are required for full disc travel of the valve

50
Q

How is Motor Operator used in place for manual hand wheel for the Fuel Transfer Tube Isolation Valve ?

A

Motor can be used but must be removed before reaching either open or closed & remaining operation must be done manually

51
Q

What is the Fuel Transfer tube sealed by ?

A

Sealed by means of remotely operated Quick Operating Closure Device located inside containment

52
Q

What does Quick Operating Closure Device do for Fuel Building & containment ?

A

-Forms the Class pressure boundary between Fuel Building & Containment
-Prevents Fuel Transfer Tube from seeing Containment pressure during Reactor Operation

53
Q

Who operates Quick Operating Closure Device ?

A

Fuels group(RAMS)

54
Q

What is the advantage of Quick Operating Closure Device ?

A

Is reduction in time & dose associated with opening & closing Fuel Transfer Tube

55
Q

What kind of FLEX indication do we have ?

A

Two FLEX SFP level indicators installed during design basis accidents

56
Q

Where are the flex indicators installed at ?

A

-One is installed in Control Room envelope
-Another is installed at entrance to RCA

57
Q

How long do the Class Nitrogen Bottles last for the gate seals ? When do they need to be changed out ?

A

-Each set of bottles should last a minimum of 18 days
-They need to be changed out when they reach 300psig

58
Q

What is Appendix A Internal SFP makeup ?

A

-Provide at least 500gpm makeup to SFP from existing Fire Protection header and Hose Stations via filling device positioned over edge of SFP

59
Q

How does NN interface with SFP?

A

NN provides control power to SFP Local Control Panel

60
Q

How does NK interfaces with SFP ?

A

NK provides power to SFP Local Annunciator Panel

61
Q

How does QA interface with SFP ?

A

QA provides power to underwater lighting in SFP,Transfer Canal, Cask Loading Pit

62
Q

How does SFP interface with Chemical & Volume Control System (CH)?

A

-CH can supply borated water from RWT to the SFP,Transfer Canal, & Refueling pool
-SFP provides 33,500gallons dedicated for emergency boration source which can inject into RCS

63
Q

How does Condensate Transfer & Storage (CST) interface with SFP ?

A

CST provides non borated water to SFP

64
Q

How does Instrument Air(IA)interface with SFP ?

A

IA pressurizes gate seals between SFP & transfer canal & between Cask Load Pit

65
Q

How does Liquid Radwaste System(LR) interface with SFP ?

A

LR Recycle Monitor Tanks provide non borated makeup water to SFP

66
Q

How does Safety Injection(SI) interface with SFP ?

A

SI transfers between RWT & Refueling pool when filling & draining Refueling Pool

67
Q

How does Radiation Monitoring interface with SFP ?

A

SFP & Refueling pools are continuously monitored by area radiation detectors

68
Q

How does HVAC interface with SFP ?

A

-HF Normal HVAC maintains temp within desired comfort range
-HF Essential HVAC available to treat Fuel Building air in event of fuel handling accident

Systems (62 decks)

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