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NLO Systems > 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 for 1) shield radiation and 2) remove thermal heat generated from rad decay of fission products

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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 concentration PV holds boron at vs the tech specs?

A

340,000 gal

PV: 4000-4400 ppm

Tech specs: >2150 ppm

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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 seen by CR

high and low level alarms —> local + CR trouble alarm

digital level indication (norm SFP level = 138.82’)

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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

SPF also meets:
Temp 60-180F
Boron concen 4000-4400 ppm
Volume >33500 gal

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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

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

1 gate seals decontamination pit from cask loading pit

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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 42 psig

2 pressurized nitrogen bottles for back up 38 psig

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16
Q

How does the SFP interface with NN?

A

Provides control power to SFP local control panel PCN-E02

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17
Q

How does the SFP interface with NK?

A

Powers SFP local annunciator panel PCN-EO2

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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 in SFP, Transfer Canal and Cask Loading Pit

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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

Continuous monitor the SFP and refueling pool via area rad detectors

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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 (can throttle discharge valve to achieve appropriate flow through PC hx)

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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 (this is above PC cleanup hand switches)

high and low discharge pressure alarms

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33
Q

During outage, What is cooling the SFP HXs?

A

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

the other hx is cooled by EW at 1340 gpm, which is then cooled by SP

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34
Q

Does the control room have SFP temperature indication?

A

no

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35
Q

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

A

If total SFP decay heat load is exceeding >125F) ability of PC cooling to maintain bulk temp <145F then—> SDC cooling is aligned to PC cooling augment decay heat removal

*pc cooling system not designed to be capable of removing design basis decay heat load + full core off-load at 100 hours post reactor trip) and fully loaded SFP

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36
Q

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

A

CS or LPSI pump

CS preferred because LPSI piping may cause runout & lack of flow instrumentation in discharge path of LPSI requires temp flow instrumentation be installed

*sys only cross-connected while PC cooling is actively augmented or could result in unacceptable level of volumes in these areas

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37
Q

How does the Fuel pool cooling interface with PG?

A

FP cooling pump power

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38
Q

How does the Fuel pool cooling interface with PK?

A

FP cooling pump control power

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39
Q

How does the Fuel pool cooling interface with NC?

A

cools HXs

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40
Q

How does the Fuel pool cooling interface with EW?

A

Back up flow for NC

cools one HX during outage

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41
Q

How does the Fuel pool cooling interface with SI?

A

SDC augment

transfers water to and from RWT and refuel pool

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42
Q

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

A

receives PC equipment drainage

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43
Q

What would happen if SFP cooling was lost?

A

SFP temperature would rise (hi alarm 125F and hi-hi alarm at 145F in CR + local)

Temp at 180F —> all non-essential personnel leave the fuel bldg

start losing water level to evaporation and damage stored fuel —> high rad level

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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

-1 train running to recirc + clean SFP
-1 train standby or used to transfer water:
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

PC cleanup system is aligned to RWT during dry cask ops- discharge pump is throttled to maintain pressure dependent on what Mode plant is in & RWT level (limit flow to maintain pressure + prevent charging pumps from tripping in low suction pressure)

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 (RWT gravity feed + charging pump to RCS flow path) of five gravity feed flow paths nonfunctional

51
Q

What is the purpose of the SFP clean up pumps?

A

1) circulate water back and forth to the FP to provide rad cleanup and maintain clarity
2) transfer water between RWT & cask load pit

52
Q

What is the capacity of the FP cleanup pumps?

A

150 gpm

53
Q

Describe the SFP clean up pump controls?

A

two position switch for each pump on the SFP control panel
-aligned to recirc RWT then pump discharge pressure may change based on plant Mode)

discharge pressure gauges at the pumps (norm maintained 80-90 psi)

54
Q

What powers the PC cleanup pumps?

A

NH

55
Q

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

A

Replaceable cartridge type

.5 micron

56
Q

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

A

25psid

57
Q

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

A

5 R/hr

58
Q

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

A

24 hours

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 —> ALARA concerns

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 or above the minimum water level to break suction in such event to stop uncontrolled drain down of SFP

Minimum requirement of spent fuel shielding of 10’ by regulatory guidance

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
(Inner tube= refueling, outer pipe= housing)

69
Q

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

A

double gasketed blind flange QOCD (quick operating closure device) + standard gate valve PCN-V118

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?

A

QOCD (Quick Operating Closure Device)

74
Q

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

A

no

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 envelope and in 140’ aux building

FLEX nitrogen bottles as back up ( >18 days use, changed out at 300 psi) to class N2 bottles for back up to IA in gate seals, assume max allowable seal leakage during extended loss of all site AC power

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

If HR-4 is initiated, conical flange watch stations are manned to open the drain valves (disconnecting hose & open 1” ball valve) to allow that water to drain out of Refueling Pool and/or UGS —> to containment RAS sump to be able to be reused for long term once-through cooling

79
Q

What does the SFP inventory provide?

A

1) shielding for plant personnel from spent fuel
2) decontamination of noble gases after fuel handling accident
3) NPSH for fuel pool cooling pumps
4) reserve volume of borated water

80
Q

What are the contact alarms for the millteonics ultrasonic level system?

A

PCN-LIT-0003:
Contact #1 High level at 138.17’
Contact #2 Low level at 137.5’

PCN-LIT-0005:
Contact #1 Low Low level (two down arrows) at 137’

*squiggly line = fail safe mode, not functional for use

81
Q

What are the makeup water sources to SFP (borated vs unborated)?

A

Borated: RWT

Unborated:
LRS Recycle Monitor Tank
CST
RMWT
DW

82
Q

What is the Beyond Design Basis Makeup source to SFP?

A

Flex modified to ass Fire Protection or Circ Water to SFP hoses, fire trucks and installed spray nozzles above the SFP or portable Spray nozzles from 100’ & 140’

83
Q

What happens if SFP gate seals pressure drops to 38 psig?

A

Pressurized nitrogen bottles will automatically take over to supply header

84
Q

What is the operation to remove SFP gate seal?

A

Prior to removing gate- water & boron level must match between both sides

AO manually count gate ribs to determine level, then can perform valve lineup to deflate gate seal —> allows refueling group RAMS to life gate out of place

85
Q

What happens if pressurized nitrogen bottles are insufficient to supply gate seal header?

A

Flex connection available to install backup nitrogen bottles on plant north end of 100’ Fuel Bldg-inside of roll-up door

86
Q

What is the tech specs for Flow path Shutdown?

A

At least 1 boron injection flow path is FUNCTIONAL:
a) from spent fuel pool via gravity feed connection and charging pump to RCS

b) from RWT via charging pump, HPSI or LPSI pump

*all valves must be in correct position (NOT be locked, sealed, or secured)

87
Q

What is the operation of fuel tube transfer?

A

Fuel moves from containment through transfer tube to Fuel Bldg

-2 fuel assembly cavities where only 1 is permitted to be transported at a time

vertical position = placed in carriage & stored

horizontal position = moved through fuel transfer tube on carriage via wheel and track system

88
Q

What is the tech specs for flow path Operating ?

A

At least 2 of 3 boron injection paths shall be FUNCTIONAL:
a) gravity feed from RWT or SFP through CH-536 isolation valve + charging pump to RCS

b) gravity feed from RWT through CH-327 SI isolation valve + charging pump to RCS

c) RWT or SFP through CH-164 boric acid filter bypass valve gravity feed + charging pump to RCS

89
Q

What is the purpose of fuel transfer tube canal isolation valve?

A

PCN-V118 isolates Transfer Canal from Fuel Transfer Tube where 36” gate valve is located on bottom of tube canal with extension shaft rising to connect square socket in 140’ floor

90
Q

What is the manual hand wheel operation of fuel transfer tube isolation valve?

A

High risk area of SFP
Install handwheel over valve socket, 700+ turns for full disc travel of valve

4 operators, 30-45min

91
Q

What is the motor operator of fuel transfer tube canal isolation valve?

A

Motor operated properly fitted may be used to operate valve instead of handwheel
-motor must be removed before reaching open/closed seat of valve —> remaining operation MUST be done via manual handwheel
-reduces time and effort to operate valve

92
Q

What is the operation of fuel transfer tube QOCD?

A

66” diameter QOCD reducing ring seals (with dual O-rings and can latch) the inner & outer tubes of the fuel transfer tube inside containment to open close FTT

RAMS (fuel groups) operated

No operator needed to enter fuel cavity as QOCD is removed and installed remotely from 140’ via extension shaft and crane

-during outage: QOCD removed before filling refueling pool, then FTT gate valve V118 is opened when common water level is reached between refueling pool and SFP

93
Q

How can FLEX be used if 140’ Fuel Bldg is inaccessible due to SFP boil over or level decreases?

A

Use FLEX N2 connection installed on 100’ Fuel bldg by the roll up door as backup to Class Nitrogen backup bottles for the SFP gate seals

94
Q

What is the purpose of SFP Makeup in DBA?

A

If unexpected inventory issues such as uncovery, high rad, zirconium fire occur- then early deployment of spray over SFP will aid in heat removal to minimize rad & max success of FP use nozzles in fuel bldg

95
Q

What is the guidance for SFP Makeup according to appendix A B C?

A

Appx A- Internal SFP Makeup:
-Provide >500 gpm makeup from Fire Protection header and hoses using filling device—> SFP

Appx B- External SFP Makeup:
-Provide >500 gpm makeup from external water source + portable pump via filling device —> SFP

Appx C- External SFP Spray:
- provide >250 gpm of spray from CW canal + portable pump & spray nozzle on 140’ Fuel Bldg —> SFP
- Alt method if 140’ inaccessible due to high rad or damage to interior: provide overspray from CW via Fire truck + hoses + portable spray nozzles on 100’ Fuel Bldg —> SFP*

*alt method does not ensure full cover of SFP = last resort

96
Q

How are FLEX SFP Makeup pumps be used in outage?

A

Pre-outage planning will have FLEX equip staged on deployment pads

FLEX SFP Makeup Pumps + CST suction are aligned to 1 of 2 FLEX nozzle makeup headers prior to reaching Mode 5 with SDC in-service

97
Q

What is the interface of SFP AND Fuel Bldg HVAC (HF)?

A

Fuel Bldg HVAC (HF) normal:
-maintains temp within desired range of Fuel Bldg

Fuel Bldg HVAC (HF) essential:
Available to treat Fuel Bldg air in event of fuel handling accident

98
Q

What is the design of the PC cooling subsystem?

A

Cools SFP during normal plant operations, including shutdown and power generation, emergency ops

Q Class + Seismic category 1
2 trains (each has cooling pump + hx)

99
Q

What is the flow path operation of Fuel Pool cooling subsystem?

A

spent fuel pool bulk temperature is maintained <125*F, where suction line takes water from warmer top water of SFP —> pump + hx —> discharges cooled water back to lower part of SFP for natural convection

One train running-both hx in parallel with only single pump (can be configuration “A” pump to “A” or “B” hx and vice versa)

Two train running- both pumps provide flow through both hx

100
Q

What is the design of the PC Cooling pumps?

A

Horizontal, centrifugal 2000 gpm to circulate water from SFP through PC cooling hx to remove decay heat from stored fuel

101
Q

What is the purpose of fuel pool cooling hx?

A

2 hx transfer heat from fuel pool to —> NC under normal ops & EW as backup

102
Q

What is the normal operations for fuel pool cooling hx?

A

NC water (shell side) is aligned to 2 PC cooling hx in parallel, horizontal at 2500 gpm

103
Q

What is the abnormal & emergency operations for fuel pool cooling hx?

A

If NC unavailable to provide cooling to SFP or LOOP —> EW is backup (shell side) of PC cooling hx

Bulk SFP temp of up to 167F is acceptable in these events

104
Q

What is the caution of operating two PC cooling pumps + SI pumps at the same time?

A

Simultaneously 2 PC cooling pumps + 1 SI pump is prohibited due to potential air entrainment into suction line

105
Q

What is the operation of PC Cleanup IX?

A

Stainless steel tanks, mixed bed disposable type resin (anion-cation)

1 IX in service with each PC Cleanup

106
Q

When should PC Cleanup IX be replaced?

A

If water temp >140F as resin are temp sensitive and high temps damage them)

107
Q

What is the flow path that Conical Flange Safety Function Protection plan provides?

A

Conical flanges installed in drain line of containment east & west sumps to allow water trapped in Refueling Pool and UGS pit 10” drain line to feed into 3” drain line to containment sump

1” drain line and ball valve for isolation
-Hose connected to ball valve and routed to floor drain for normal draining

108
Q

What is the purpose of conical flanges?

A

During outage, when core is loaded and >50% reactor head de-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 —> unusable water for purpose of long term cooling via natural circulation or long term recirculating from RAS sump and HPSI pump

109
Q

What is the operation for Conical Flange Safety Function Protection Plan?

A

Standard Appx 254 of Refueling Pool and UGS to RAS which ensure sufficient inventory and pump NPSH for long term Once-Through Cooling

2 AO inside High Rad Area containment (1 perform, 1 ensure the 1st AO safety) prompt action 10min after CR notice
-AO have no other emergency responsibilities
-trained on routes, access, hazards
-all tools necessary are staged
-need permission prior
-need drain hoses on conical drain valves for personnel protection

NLO Systems (66 decks)

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