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ILT 2022 > Exam 1 > Flashcards

Exam 1 Flashcards

1
Q

NB Bus Feeder Breakers (NB0112, 0212, 0209, 0109)

  • Requirements to close
  • Trips
A
  • To close manual from MCB:
    • Synch Scope ON
    • No faults on breaker or Xfmr
    • Alt (Normal) and AEPs Breakers OPEN
    • Synch Check lit (if paralleling w/ EDG
  • Trips:
    • Manual
    • Bus UV
    • Xfmr Fault
    • Feeder Breaker Fault
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2
Q

Stopping an AEPs Diesel

A
  • Stop Push Buttons:
    • On respective breaker cubicle on PA501 (Switch House)
    • Outside door on DG Enclosure
    • Inside enclosure on enging control panel
    • Inside enclosure mounted one engine
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3
Q

Methods to Start EDG

A
  • Manual @ MCB via Start/Reset PB (Master Xfer Switch in AUTO)
  • Manual @ Local Generator Control Panel via Start PB (Master Xfer Switch in LOC/MANUAL)
  • Manual by actuation of either air start solenoid
  • **Manual via Local Generator Control Panel via Popout Button
  • **Auto - NB Bus UV (2/4) via LSELS (Master Xfer Switch in AUTO)
  • **Auto - SIS via SSPS (Master Xfer Switch in AUTO)

** Emergency Starts: Operator Voltage/Frequency controls disabled until unit parallel switch momentarily placed in parallel, signal is reset, and Start/Reset PB pressed.

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4
Q

EDG Local Emergency Start

  • List the methods & order of preferance for a local emergency start of the DGs per the EOPs
A
  1. Reset Engine Shutdown Relay or Stat Failure Relay by pressing Engine Shutdown Reset PB
  2. Emergency Start Popout button on Generator Control Panel (Break Glass or remove glass cover).
  3. Place Master Transfer Switch in LOC/MANUAL then press START
  4. Manually actuate either air start solenoid.
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5
Q

NK Batteries

  • Ratings of each battery
  • T/S requirements for DC Sources
A
  • NK11 & 14: 1650 Amps/hour
  • NK12 & 13: 900 Amps/hour
  • All are rated to supply emergency loads for 200 minutes without chargers.
  • Train:
    • NK01 powered from NK11 and NK21 or NK25 (swing) powered from NG01 (PG19 not acceptable)
    • Same for NK03 to constitute Train A.
    • ** NK25 may only be credited once.
  • T/S 3.8.4/5:
    • Modes 1-4: 2 Trains
    • Modes 5-6 and during irradiated fuel movement: 1 train
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6
Q

XNB01/02 Trips

A

[NFLGOD]

  • Neutral Ground OC
  • Fault - Transformer (2/2)
  • Low Oil Level (Xfmr Low-Low Level & LTC “Critical Low”)
  • Ground Overcurrent
  • Overcurrent
  • Differential Overcurrent
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7
Q

NG Bus Tie Breakers (NG0116 & 0216)

  • Interlocks when racked out
  • T/S Implications
  • Limitations on Cross-Connecting
A
  • If tie breakers are racked out, the associated supply cannot be closed (NG0101 and NG0201 respectively)
  • When NG busses are x-tied all four DEGRADED bus voltage channels for their respective NB bus are INOPERABLE per T/S 3.8.9
    • T/S Action 3.3.5.B.1
    • T/S Action 3.8.1.F
  • DO NOT EXCEED 1200 Amps on bus from feeding both NG busses from 1 NG Xfrm.
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8
Q

S/U Xfmr

  • Manual Closing
  • Auto Close features
A
  • Manual:
    • ​Local: Racked in and Local HS in Close
    • MCB: HIS-6 in closed, source Synch Scope in SUT, S/U Xfmr engergized, Synch Check relay Sat, No LOs on SUT, No LOs on SUT or UAT output breakers.
  • Auto Fast Xfer:
    • ​HIS-6 in Normal after Trip; V53 and V55 open, or MA Fault, or MD fault; S/U Xfmr energized; Synch Relay energized; No LOs on SUT; No LOs on SUT or UAT Breakers.
  • Auto Dead Bus Xfer:
    • ​HIS-6 in Normal after trip; V53 and V55 open, or MA Fault, or MD Fault; 10 cycle TD after UV; UAT output breaker open; No LOs on SUT; No LOs on SUT or UAT Breakers.
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9
Q

S/U Xfmr Trips

A
  • Bus Feeder (PA0110, PA0202) Lockouts (LOs)
  • SUT LO (High Side)
  • SUT LO (Low Side)
  • UAT Breaker selected and closed
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10
Q

PB03/04 Feeder Bus (PB0306/PB0402)

  • Closing Operation
  • Trips

PB03/PB04 X-Tie Breaker (PB0401)

  • Manual Operation
  • Auto Operation
A

PB0306/PB0402

  • Manual Operation from Local or MCB
  • Trips on:
    • Xfmr OC
    • Ground OC
    • Neutral Ground OC
    • Differential OC
    • Transformer Overpressure (2/2)

PB0401

  • Closed from MCB If:
    • Synch Check SAT
    • NO Breaker Faults
    • NO Faults on PB03 or PB04
  • Auto close if:
    • XPB03 or XPB04 LOs and control switch is Normal
  • Auto Trip if:
    • Bus tie ground fault → also trips bus feeders
    • Bus feeder breaker fault
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11
Q

PG Load Center Feeders

  • Trips
  • PG Tie Breaker Interlocks
A
  • Trips:
    • Manual
    • OC
    • Respective 13.8kV Feeder Breaker (PA0105, 0106, 0207, 0206) trips on fault
  • If Xfmr LO it will trip its 13.8kV feeder and all Load Center Supply Breakers
  • Tie Breakers
    • If tie breaker racked out the following supply breakers cannot be closed:
      • PG1101, 1301, 1601, and 1901.
      • PG1201, 1401, 1501, and 2001 can be closed.
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12
Q

PJ and PK

  • PJ Loads
  • Chargers & ratings (PJ & PK)
A

PJ

  • S/G Feedwater Pump Emergency LO Pump (2)
  • Generator Emergency LO Pump
  • Generator Emergency Seal Oil Pump
  • PG12 → PJ21
  • NG02 → PG31
  • 200 Amps/hour chargers
  • PJ11 Rated for 1200 Amps/hr for 120 minutes

PK

  • NG01 → PK21/23
  • NG04 → PK22/24
  • 300 Amp/hour chargers
  • PK Batteries 2400 Amps/hour for 120 minutes
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13
Q

UV and Degraded Voltage

  • List setpoints, coincidences, and logic for:
    • UV (NB Bus)
    • Degraded Voltage
A
  • UV:
    • _​_70% voltage
    • 2/4 detectors
    • 1 second
  • Degraded Voltage
    • ​90% voltage for 8 seconds
    • 2/4 detectors
    • Causes trip after 111 time delay w/o SI Signal.
    • Immediate Trip with SI Signal (After 8 seconds)
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14
Q

SDS and LOCS Sequencer

  • Inputs to SDS and LOCA Sequencer
  • How to reset each sequencer
A
  • SDS
    • _​_Inputs:
      • Normal & Alternate Breaker Positions
      • DG Breaker Positions
      • No CSAS or SI Signal
    • Reset:
      • Off-site power restored to bus
      • Normal or Alternate Feeder Breaker Closed
  • LOCA
    • _​_Inputs:
      • SSPS Cabinets (SI, CSAS) and UV Signals
      • DG Output Breaker position and CSAS or SI
    • Reset:
      • SIS Reset PBs on RL002 and/or
      • CSAS reset PBs on RL018
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15
Q

PN11/PN12

  • Power Supplies
  • What they provide
  • Backups
A
  • Supplies DFWCS
  • DC (1st Alt) supplies if normal supply lost.
  • 2nd Alt supplies via static transfer and bypass switch if Inverter fails.
  • When supplied by PK Batteres, UPS will shutdown and secure DFWCS after 60 minutes.
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16
Q

PN01/PN02

  • Power Supplies
  • What they provide
  • Backup Supplies
A
  • Supply 7300 control cabinets RP040 (44) & RP043(47)
  • No static transfer switch.
    • On loss of AC source, auto swaps to DC source via blocking diode.
17
Q

PN07/PN08

  • Power Supplies
  • What they provide
  • Backup Supplies
A
  • Supplies various MCB meters/controllers/recorders & rad monitors
  • Utilizes an ATS Between XN07(08) and XPN07D(08D) output.
    • On loss of power will auto swtich after 0.5 seconds.
    • On restoration will switch back after 2 mins.
    • On manual transfer, will not transfer back automatically.
18
Q

PN09/PN10 and SP01

  • Power Supplies
  • What they provide
  • Backup Supplies
A
  • Provide PN09A/10A respectively.
  • SP01 provides rad monitoring system
  • Equipped with static transfer switch that auto swaps from normal to alternate.
    • Will auto transfer back.
    • STS has synch circuit.
19
Q

AEPS conditions that Inhibit Functionality

A
  • System inhibit swtich on PA501 in “Inhibit” (Key Operated)
  • Gen. Output Bkr racked out
  • Gen. Output Bkr HS not in Normal after Close (NAC)
  • Gen Output Bkr engine control switch ≠ Auto
  • Engine control panel - EMCP 3.3. Controller ≠ Auto
  • 24 VDC Control Power not energized
  • CO2 fire suppression system actuated
  • Electrical fault or LO device (86 Relay) actuated
  • Diesel Gen. or Bkr selected for lockout/tagout on PBXY0001
  • Diesel Gen. STOP PB actuated
20
Q

Fuel Oil Transfer

  • Operation of Transfer Pump
    • Standby
    • DG Running
    • Receipt of Fire Alarm
  • Fuel Oil Day Tank
    • T/S Requirements
    • Size
    • Alarms
A
  • Standby:
    • Pump Starts @ 3.667’ in Day Tank, secures @ 6.516’
    • Redundant start @ 42” in Tank.
  • Operating:
    • Runs continuously when > HSR (Once Day Tank drops to 3.667’), Day tank will overflow to Fuel Oil Storage Tank
  • Fire Alarm:
    • Not running: Stops Xfer Pump
    • Running:
      • ‘A’ EDG Xfer Pump will not stop.
      • ‘B’ EDG Xfer pump will stop if in ISO/RUN
  • Fuel Oil Day Tank:
    • T/S requirement 2.77’ (3.5’ SR Acceptance) ~ 510 gallons
    • Alarms:
      • Lo level alarm: 40.47”
      • Standpipe Lo Level: 2.95’
      • Standpipe Hi Level: 7.227’
21
Q

DG Start Circuitry

  • What occurs at the following speeds?
    • 85 RPM
    • 125 RPM
    • 471 RPM
    • 475 RPM
A
  • 85 RPM:
    • ​Air shutoff relay de-energizes the air start solenoids
    • Room ventilation damper de-energizes to open
  • 125 RPM - LSR [FEEDDS]:
    • Field Flash
    • Enables gover speed control HS
    • Enables auto operation of Rocker Arm Prelube Pump on Low Pressure
    • De-energizes Lube Oil KW Heater
    • De-energizes Generator Space heaters
    • Stops Jacket Water KW PUmp
    • ** If LSR is not acheifed in 7 secs, engine start failure relay energizes, de-energizing air start solenoids.
  • 471 RPM - HSR [ARBOR]:
    • _​A_larm delay relay actuation - after 4 sec all P/Ts must be in band or alarm
    • Redundant Field Flash Signal
    • Backup signal to de-energize the air start solenoids
    • Output Breaker “At-Speed” close permissive
    • Run time meter enabled.
  • 475 RPM:
    • _​(_36.5 psig Jacket Water pressure) parallel circuit actuated to backup HSR
22
Q

Fuel Oil Storage

  • Basis for storage capacity
  • T/S min for Fuel Oil Storage Tank (FOST)
A
  • 100,000 gallon capacity
  • T/S min 80,900 gal to operate DG continuously for 7 days.
  • 3.8.3 when associated DG required to be oeprable per 3.8.1/3.8.2
    • Fuel Oil > 80,900 in each tank & no accumulated water
      • If Fuel Oil 69,800 - 80,900, restore to limit in < 48 hours
      • If < 69,800 gal - Immediately declare DG inoperable
23
Q

DG Lube Oil Systems

  • Sump level control
  • Keep warm temp band
  • Control of aux oil pump
  • Control of KW heater
  • T/S for Lube Oil Storage
A
  • Aux LO tank makes up to engine sump (measured by level control tank) 24.7” - 26” below crankshaft centerline.
  • Keep warm maintains 125° - 130°F.
  • Aux Oil pump: HS in AUTO or ON - runs continuously unless HS in OFF or emergency shutdown.
  • KW heater - Auto when DB < 125 rpm. Will not run unless < 125 rpm and Aux oil pump running.
  • T/S 3.8.3 when DG required to be operable per 3.8.1/3.8.2 Lube Oil > 750 gallons.
    • If < 750 gallons IMMEDIATELY declare DG Inoperable
24
Q

DG Starting Air T/S

A
  • 2 Receivers: 435 psig
  • 1 Receiver: 610 psig
  • > 250 psig in 2 or > 300 psig in 1 will allow a start and the DG does not have to be immediately declard inoperable.
25
Q

NN Inverters

  • Operation of static transfer switch
  • What constitutes a train of INVs?
  • OTN-NN-00001 Precautions for:
    • NN Bus De-Energized
    • Powering bus from bypass xfmr
A
  • On loss of DC Supply, will auto swap to bypass transformer. Swap back is manual.
  • Train A: NN01 powered from NN11 or NN17* and connected to DC bus NK01 and NK11. *Swing Inv may only be credited for one of two INVs.
  • NN Bus de-engergized:
    • Single Channel Trip of Reactor Protection System (RPS), leaving plant in 1/3 logic.
    • If SR/IR Flux trips not blocked a Rx Trip Signal will be generated.
    • 1 UV channel and 1 degraded voltage channel for each LSELS.
  • When NN Invertor power from bypass circuit there are several energize to actuate functions not available:
    • CTMR Hi-3
    • RWST Lo-Lo
    • NB Bus UV
26
Q

UAT Breaker Trips

A
  • Bus Feeder LO (Stuck Breaker for 5 cycles, OC, Ground OC)
  • V53 and V55 Open
  • MD Lockout
  • MA Lockout
  • HIS-6 in Close, Source S.S. in SUT, SUT Bkr Closed
27
Q

UAT Bkr Closing

A
  • Manual Close:
    • HIS-6 in Close
    • Source S.S. in UAT
    • V53 or V55 closed
    • No LOs on MA, MD, or Bus Fdr Bkr
    • Synch Check Sat
28
Q

DG Output Breaker (NB0111/NB0211)

  • Auto Closure
  • Manual Closure
  • Breaker Trips / Vital engine trips
A
  • Auto Close:
    • _​_Norm, Alt, & AEPS Bkr open
    • MTS in Auto
    • Gen @ Voltage (4160V)
    • Gen. @ Speed (> 471 RPM)
    • JW pressure equiv. to 475 RPM
    • No (vital) LO relays on bus or EDG.
  • Manual:
    • Gen. @ speed and voltage
    • No LO relays on bus or EDG
    • Synch check relay sat
    • Synch SS in DG Bkr Position
    • Breaker Control Switch in Close
  • EDG Breaker Trips (Normal Starts Only):
    • ​N- Nuetral Ground OC
    • U- UV
    • V2- Volts/Hz Relay, Voltage Restrained OC
    • U- UF
    • L- Loss of Field
    • O- OC
    • R- Reverse Power

PLUS

  • EDG Vital Engine Trips (Norm & Emer. Starts)
    • ​Hi Jacket Water temp (185°, 190°, 195° - 2/4)
    • Hi Crankcase Pressure (1” H20 alarm, 6 psig 2/3)
    • Low Lube Oil Pressure (70, 65, 60, 60 psig - 2/4 one being 60)
    • Overspeed (570 rpm)
    • Differential OC
29
Q

List Loads Shed by LSELS

A
  • UV:
    • ​Safety:
      • _​_CCW Pumps
      • RHR Pump
      • ESW Pump
      • SI Pump
      • CS Pump
      • AFW Pump
      • Fuel Pool Cleaning Pump
    • Non-Safety:
      • _​_Inst. Air Compressors
      • PZR B/U Heaters
      • PK Battery Chargers
      • PJ Battery Charger*

* NB02 Only, backup supply to charger.

  • LOCA
    • Non-Safety:
      • _​_Inst. Air Compressors
      • PZR B/U Heaters
      • PK Battery Chargers
      • PJ Battery Charger*
      • CRDM cooling fans
      • Boric Acid Xfer Pumps
      • BG-HV-8104 (Immediate Boration to CCPs) - NB02 Only
30
Q

PB-121/122/123

  • Auto bus xfer conditions
  • Which way will each bus xfer?
A
  • Auto Xfers on:
    • Xfmr LO or Xfmr Feeder LO; AND
    • No PB bus fault
    • Tie Bkr synch check SAT or PB bus fdr breaker open
    • Local/Remote Selector Switch in remote.
  • PB121 ↔ PB122 ← PB123
    • Arrows indicate directino of Xfer, e.g. if XPB123 faults, PB123 xties to PB122

ILT 2022 (6 decks)

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