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NLO Systems 2023 > PC- Fuel Pool > Flashcards

PC- Fuel Pool Flashcards

1
Q

What is the primary purpose of the spent fuel pool?

A

to store used fuel after its been removed from the reactor

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2
Q

What does the layout of the fuel in the spent fuel pool prevent?

A

so the mass doesn’t go critical

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3
Q

What is the water capacity of the SFP and what is the boron concentration?

A

340,000

4000-4400

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4
Q

What is the maximum number of fuel assemblies that can be stored in the SFP?

A

1205

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5
Q

How is the spent fuel pool monitored?

A

yardstick type level device with a camera on it

high and low level alarms

digital level indication

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6
Q

What happens when the SFP transfer canal gate is removed and the transfer canal level reaches 138’ 3”?

A

flood new fuel elevator cable tray

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7
Q

What is the purpose of the new fuel elevator?

A

lower new fuel from operating floor to the bottom of the pool

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8
Q

In the refueling pool, what happens if the pool level goes above 138’ 2”?

A

water intrusion to the in-core-instrument tubing shield

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9
Q

What is the tech spec related to fuel pool water level?

A

when moving spent fuel, water level shall be 23’ or more over the top of the fuel

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10
Q

What is the tech spec related to the boron concentration in the fuel pool?

A

concentration shall be 2150 ppm or higher

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11
Q

What is the tech spec related to the spent fuel pool being a borated water source, operating or shutdown?

A

fuel pool must be functional in the case the RWT is unavailable

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12
Q

What is the required temperature range for the SFP?

A

60F-180F

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13
Q

What is the required volume of the SFP borated water source?

A

33,500 gal

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14
Q

What is the purpose of the SFP gate seals?

A

Seal off the SFP from the cask loading pit and transfer canal so they can be drained if necessary

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15
Q

The gate seals on the sides of the SFP gates are Q class and pressurized with:

A

instrument air

nitrogen back up

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16
Q

How does the SFP interface with NN?

A

control panel power

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17
Q

How does the SFP interface with NK?

A

annunciator panel

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18
Q

How does the SFP interface with CH?

A

RWT supplies borated water to SFP system

33,500 gal of the SFP is dedicated for emergency boration to RCS

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19
Q

How does the SFP interface with CT?

A

non-borated water make up to SFP

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20
Q

How does the SFP interface with FH (fuel handling and storage)?

A

conveys fuel assemblies to and from SFP, stores assemblies in storage racks, provides spent fuel cask handling and storage

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21
Q

How does the SFP interface with IA?

A

pressurizes SFP gate seals

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22
Q

How does the SFP interface with LR (liquid radwaste)?

A

RMTs (recycle monitor tanks) make up non-borated water to SFP

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23
Q

How does the SFP interface with QA?

A

underwater lights

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24
Q

How does the SFP interface with SI?

A

transfers water to and from the RWT and refueling pool

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25
Q

How does the SFP interface with SQ (radiation monitoring)?

A

monitor the SFP and refueling pool

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26
Q

What are the entry requirements for the high risk area around the SFP?

A

quality log entries

FME control

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27
Q

What is the purpose of the fuel pool cooling system?

A

cool the SFP

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28
Q

What powers the SFP cooling pumps?

A

PG

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29
Q

What is the temp range of the spent fuel pool?

A

75-125*F

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30
Q

What is SFP cooling pump discharge pressure maintained at?

A

45-55 psi

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31
Q

how long do you have to align EW and SP to the SFP so temperature stays less than 167*F?

A

8 hours

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32
Q

describe the fuel pool cooling pump controls

A

3 position switch for each pump

discharge indication is on SFP control panel

high and low discharge pressure alarms

33
Q

During outage, What is cooling the SFP HXs?

A

one is cooled by NC, which is cooled by PW Tmod

the other is cooled by EW, cooled by SP

34
Q

Does the control room have SFP temperature indication?

35
Q

What is the purpose of the SDC augment to the fuel pool cooling system?

A

When temperature is approaching 125*F in the fuel pool, one SDC train is lined up to assist in cooling the pool

36
Q

What pumps can be used for, and what pump is preferred for SDC augment?

A

CS or LPSI

CS because LPSI piping may cause runout

37
Q

How does the Fuel pool cooling interface with PG?

A

FP cooling pump power

38
Q

How does the Fuel pool cooling interface with PK?

A

FP cooling pump control power

39
Q

How does the Fuel pool cooling interface with NC?

40
Q

How does the Fuel pool cooling interface with EW?

A

Back up flow for NC

cools one HX during outage

41
Q

How does the Fuel pool cooling interface with SI?

A

SDC augment

transfers water to and from RWT and refuel pool

42
Q

How does the Fuel pool cooling interface with RD (radioactive waste drain)?

A

receives PC equipment drainage

43
Q

What would happen if SFP cooling was lost?

A

SFP temperature would rise

start losing water level to evaporation and damage stored fuel

44
Q

What would happen if NC was lost to the SFP cooling?

A

SFP would heat up

need to align EW

45
Q

If power was lost to the running SFP cooling pump or pump controller, what should be done?

A

start the other pump

46
Q

What is the purpose of the FP cleanup system?

A

decon of SFP

radioactive cleanup and water clarity of SFP, transfer canal, refueling pool and RWT

keep dose less than 2.5 mR/hr

47
Q

What are the components of the SFP clean up system?

A

two trains of a strainer, pump, filter and IX

48
Q

Where can the SFP clean up system transfer water to and from?

A

transfer canal

cask load pit

UGS pit

49
Q

In regards to the SFP clean up system, what is done a month prior to outage?

A

second train is aligned to recirculate and clean the RWT

50
Q

What is the impact to nuclear safety when the RWT is cross connected to the SFP clean up system?

A

it connects a seismic rated system with a non seismic rated system

deems two of five gravity feed flow paths nonfunctional

51
Q

What is the purpose of the SFP clean up pumps?

A

circulate water back and forth to the FP to provide cleanup and maintain clarity

52
Q

What is the capacity of the FP cleanup pumps?

53
Q

Describe the SFP clean up pump controls?

A

two position switch for each pump on the SFP control panel

discharge pressure gauges at the pumps

54
Q

What powers the PC cleanup pumps?

55
Q

What type of filters are the PC clean up filters? How small of particles do they remove?

A

cartridge

.5 micron

56
Q

What is the alarm setpoint for PC clean up filter D/P?

57
Q

What set point, besides D/P, will require the PC cleanup filters to be changed?

58
Q

How long do the PC cleanup filters have to sit, isolated, prior to maintenance?

59
Q

Where are the PC clean up filters located?

A

aux building 120’ under shielded floor plugs on the 130’

60
Q

What is the D/P limit on the PC cleanup IXs?

A

350” H2O

61
Q

What happens when PC clean up loses NH?

A

PC clean up pumps lose power

62
Q

How does PC clean up interface with CH?

A

recirc RWT

BAMPS transfer from RWT to SFP through PC clean up

63
Q

How does PC clean up interface with SR (solid radwaste)?

A

receives PC clean up IX spent resin

64
Q

How does PC clean up interface with RD (radioactive waste drain)?

A

receives equipment drainage

65
Q

What happens when PC clean up is lost?

A

dose rates will rise

66
Q

What happens if PC clean up loses SR (solid radwaste)?

A

cant transfer resin to radwaste

will be required to transfer resin to truck bay or lined container

67
Q

What purpose do the siphon breakers in the PC clean up system serve?

A

in the case of a line break, they will break siphon in the pipes coming out of the SFP at the minimum water level

68
Q

What is the purpose of the fuel transfer tube?

A

connects the transfer canal to containment for transferring spent and new fuel in and out of containment

69
Q

what prevents leakage from the transfer canal to the refueling pool?

A

double gasketed blind flange QOCD (quick operating closure device)

70
Q

Where is the refueling pool located?

A

containment

71
Q

What is the purpose of the fuel transfer tube gate valve?

A

isolates the SFP from the refueling pool

72
Q

What are the concerns associated with the SFP and refueling pool level variations when the fuel transfer tube valve is open?

A

if the SFP transfer canal gate is removed, they become a giant manometer and changes in pressure due to ventilation in the fuel building and containment change the water level in each of the pools

73
Q

What forms the class pressure boundary between the fuel building and containment?

74
Q

Does the fuel transfer tube see containment pressure during reactor operation?

75
Q

What is the advantage of the QOCD?

A

reducing time and dose associated with opening and closing the fuel transfer tube

76
Q

What is the FLEX equipment for the SFP

A

level indication by control room and in aux building

FLEX nitrogen bottles as back up to class N2 bottles for back up to IA in gate seals

external make up sources to SFP

77
Q

What are the AO actions for Dry cask fuel storage operations?

A

valve line up for RWT to BAMPs then to PC clean up pumps then cask pit

operate gate seal system to deflate or inflate gate seals

drain cask load pit

78
Q

What is the need for Conical Flange Watches during outage?

A

When core is loaded and reactor head not tensioned, SI is initiated on a LOCA.

instead of coolant going into the RAS sumps, some of it goes out the top of the reactor and into the refueling pool and UGS pit

conical flange watch stations are manned to open the drain valves to allow that water to drain to the RAS sump

NLO Systems 2023 (67 decks)

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