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ILT 2022 > Exam 2 > Flashcards

Exam 2 Flashcards

1
Q

RCP

  • Flowrate, Motor HP, Power Supply
  • Flywheel purpose
  • Anti-rotation device purpose. When does it actuate?
  • CCW Cooling - What does it cool? CIS valves - what closes them?
    • Excess flow values & setpoints
  • Interlocks
A
  • 100,200 gpm @ 290 ft of head each, 7000 HP Motor - P/S A-3 PA0107, 0108, 0205, 0204
  • Adds inertia to shaft to allow longer coastdown time for Decay Heat Removal. Takes ~4 minutes for pump to coastdown.
  • Prevents idle RCP from water wheeling. 70 RPM
  • CCW: Cools Thermal Barrier H/X, motor bearings, and motor air coolers.
    • CIS: Inlets: EG-HV-71,68 (outer); EG-HV-60,59 (In/Out); EG-HV-62/61 (In/Out). Closed on CIS-B (Hi-3 or manual CSAS)
    • Excess flow: If FT-13 thru 16 sense > 50 gpm BB-HV-13 thru 16 will individually close. If FT-62 senses > 206 gpm EG-HV-62 will close isolating all Thermal Barrier H/X’s.
  • Will not start unless: Lift oil pump running and oil pressure > 600#
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2
Q

PRT (OTN-BB-00004)

  • PRT level restriction prior to degas
  • Hydrogen precautions
  • Concern for leakage when RCS pressure < PRT pressure
  • Concern for draining PRT to CTMT Normal Sumps
  • Time to cooldown PRT
A
  • PRT Level > 19% until degassed to prevent PRT atmosphere from going into RCS.
  • H2 Precautions:
    • Maintain N2 blanket to prevnt H2/02 explosive environment.
    • [H2] shall be < 4% prior to venting PRT to atmosphere.
    • PRT [O2] content must be < 3% prior to putting H2 on VCT.
  • If Rx makeup water pressure > RCS pressure, water may leak into RCS via excess letdown line.
  • If draining PRT to containment normal sumps, sump pumps cannot keep up and should only be done in emergency w/o verifying [H2] < 4%.
  • PRT Cooling: 1 hr by spraying makeup water, 8 hours by circulating w/ RCDT H/X.
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3
Q

RVLIS

  • RVLIS inputs & purpose
A
  • RVLIS - Indicates Rx Vessel level based on D/P between Rx Vessel head & seal table. Adjusted for density based on TH.
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4
Q

COMS

  • Purpose
  • Controls
  • Inputs
A
  • Mitigates an overpressure at low temperature.
  • COMS must be ARMED
    • Block valve opens when in ARM (cannot be closed unless COMS is blocked)
  • Auctioneered Low WR Temperature used to calculate Pmax & compared to channels WR Pressure. It’s used to actuate PORVs.
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5
Q

Rod Banks & Groups/Speeds

A

Control Banks (25 Total)

  • A: 4 (2/2) - 1 AC / 2 AC
  • B: 8 (4/4) - 1 BD / 2 BD
  • C: 8 (4/4) - 1 AC / 2 AC
  • D: 5 (2/3) - 1 BD / 2 BD

Shutdown Banks (28 Total)

  • A: 8 (4/4) - 1 AC / 2 AC
  • B: 8 (4/4) - 1 BD / 2 BD
  • C: 4 (one group) - SCDE
  • D: 4 (one group) - SCDE
  • E: 4 (one group) - SCDE

Speed

  • Shutdown Banks: 64 SPM
  • Control Banks:
    • Manual: 48 SPM
    • Auto:
      • -1.5° to -3°: 8 SPM
      • -4°: 40 SPM
      • -5°: 72 SPM
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6
Q

RCS Inventory Balance (OSP-BB-00009)

  • Frequency
  • Acceptance Criteria
  • Basic Steps
A
  • Every 72 hours for 1 hour minmum.
  • Acceptance:
    • Unidentified Leakage < 1 gpm
    • Identified Leakage < 10 gpm
    • Primary to Secondary Leakge < 150 gpd per S/G.
  • Steps:
    • Tave controlled within 1°F
    • Pressure stable ± 15 psig
    • Dilutions and borations avoided during test
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7
Q

RCS WR Temperature

  • Number
  • Range
  • What they provide inputs to.
A
  • 1 TH & 1 TC per loop.
  • 0° - 700°F
  • Input to:
    • COMS
    • RVLIS
    • Subcooling Monitor
    • MCB Indication/Recorders
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8
Q

Power/Logic Cabinet Urgent Alarms

A

Power Cabinet (Low Low RPM)

  • Loose or missing card
  • Logic error
    • Zero current ordered to both Stationary and Movable gripper coils @ same time
  • Regulation Failure
    • Sampling resistor current not expected
  • Phase Failure
    • SCR Bridge not operating properly.
  • Multiplex error
    • More than 1 group of rods in 1 power cabinet try to move at once.
  • Power cabinet non-urgent occurs when one instrumentation power supply fails. If caused by main power supply, attempted rod motion will cause urgent.

Logic Cabinet (LIPS)

  • Loose or missing card
  • Input to slave cycler incorrect
  • Pulser failure
  • Shutdown Bank C,D,E circuit failure.
  • Logic Cabinet urgent failure prevents all auto and manual rod motion.

Urgent Failures:

  • Failure alarm locks selected group, energizing both SGC & MGCs.
  • “Inhibit signal prevents all rod motion from that cabinet.
  • Rx Trip causes regulation and logic errors.
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9
Q

Shutdown Bank Withdrawal (OTG-ZZ-0001A)

  • Precautions
  • Prerequisites
A

Precautions

  • Avoid activities that could cause distractions in MCR.
  • SR NIs operable per T/S 3.3.1
  • Reactivity Management SRO must be designated.
  • If counts ↑ x4 withdrawal suspended and rods inserted.
  • If critical is acheived befroe S/D banks withdrawn enter OTO-ZZ-00003 for loss of SDM & initiate immediate boration.

Prerequisites

  • CRS Permission
  • Ensure 2 SR NIs operable
  • If following refuel, request engineering for ICRR Plot Support
  • Designate Reactivity Management SRO.
  • Ensure reactivity management brief has been completed.
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10
Q

Rod Control Logic Cabinet Components

  • Purpose of:
    • Pulser
    • Master Cycler
    • Bank Overlap Unit
    • Slave Cyclers
  • Bank Overlap Thumbwheels
A
  • Pulser supplies output pulses to master cycler. (# of output pulses is 6x # of input pulses)
  • Master Cycler is a reversible counter that correctly sequence the groups within the rod banks.
  • Bank Overlap Unit is a counter that keeps a record of control bank operation, and determines the proper sequence of bank operation for the overlap scheme.
  • Slave Cyclers generate the required sequence of current orders to the CRDM coils for rod motion.

Bank Overlap Thumbwheels:

  • S1: 115
    • A: 115
    • B: 0
  • S2: 228
    • A: 228
    • B: 113
  • S3: 230
    • B: 115
    • C: 0
  • S4: 343
    • B: 228
    • C: 113
  • S5: 345
    • C: 115
    • D: 0
  • S6: 458
    • C: 228
    • D: 113​
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11
Q

MCB Startup Reset Switch​

A
  • Resets [POSSUM]:
    • ​Pulse to Analog Converter to 0
    • Bank Overlap unit to 0
    • MCB Step Counters to 0
    • Slave Cycler
    • Urgent Alarm Circuits
    • Master Cycler
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12
Q

PZR Spray Valves

  • Setpoints
  • Flowrate and basis
  • Bypass valves
  • Connection to RCS Loops
  • RCP Requirements
A
  • Setpoints
    • Start Opening: Controller setting + 25 psig (2260 psig nominal)
    • Full Open: Controller setting + 75 psig (2310 psig nominal)
  • Flow Rate:
    • 450 gpm each.
    • Sized to prevent PORV actuation on 10% setp load change.
  • Bypasses:
    • Manual valve allows 0.5 gpm thru spray outlet for chemical mixing (boron) and limits thermal stress.
  • Connection to RCS Loops: PCV-455 B ← Loop 1 TC; PCV-455C ← Loop 2 TC
  • RCP Requirements:
    • Loop 1 or 2 RCP must be running to drive flow (D/P between spray line and surge line in Loop 4)
    • Most effective if loop 4 RCP is running (due to lower static pressure in Loop 4 hot leg/surge line w/ RCP running)
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13
Q

PZR (code) Safety Valves

  • Number
  • Setpoint
  • Flowrate
  • Basis
A
  • Number: 3
  • Setpoint: 2460 ± 49 psig
  • Flowrate: 420,000 gpm each
  • Basis: Prevents exceeding design pressure following 100% load loss to turbine with no dumps or rods.
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14
Q

RCP Seals

  • For each seal: How it works, flowrates & Leakoff Paths
  • # 1 Seal ΔP limitation
  • Standpipe makeup
A
  • Seal #1:
    • Controlled leakage seal.
      • Leakage controlled by ensuring gap b/w seal ring and runner is held constant by balancing hyrostatic forces.
    • Seal injection from CVCS flows into space b/w #1 seal & bearing @ 8 gpm.
    • 3 gpm flows past #1 seal (5 gpm into RCS) and into the VCT (per pump).
    • DO NOT EXCEED 200 psid across the seal.
  • Seal #2:
    • ​Face rubbing seal.
    • Backpressure from #2 seal forces flow into VCT.
    • On loss of injection becomes film riding.
    • Allows 3 gph to RCDT.
  • Seal #3:
    • Face rubbing w/ double dam.
    • Backpressure from #3 seal forces water to RCDT.
    • Standpipe leaks 400 cc/hr to RCDT and another 400 cc/hr to CTMT Normal Sump
  • Standpipe Makeup:
    • _​_BB-LCV-178 thru 181 auto makeup from RMWST to maintain 26.6” - 41.5”.
    • Can be manually controlled at RL021.
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15
Q

PZR PORVs

  • Lift setpoint & minimum system pressure
  • How they operate
  • Solenoid power supply & PORV designators
  • Flow rate
  • Block valve power supplies & designators
A
  • Lift Setpoint:
    • 2335 psig (nominal)
      • Variable for COMS.
    • Minimum 125 psig system pressure to operate
    • Reseats 2315 psig.
  • How:
    • ​Solenoid opens → Opens pilot → system pressure opens main valve
  • Designators/Power Supply:
    • BB-PCV-455A (‘A’ Train): NK51
    • BB-PCV-456A (‘B’ Train): NK44
  • Flowrate: 210,000 gpm each
  • Block Valve Designators/Power Supplies:
    • BB-HV-8000A (‘A Train): NG01B
    • BB-HV-8000B (‘B’ Train): NG02B
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16
Q

PZR Setpoints

  • Design parameters
  • Program level Range
  • Level Setpoints
A
  • Design:
    • _​_5%/min load ramp, 10% instant load change, 50% load reject w/ auto rod control & steam dumps w/o Rx Trip, No SI from Rx & Turbine Trip
    • 1800 ft³ prevents water hammer thru safeties during loss of load w/ high Pressurizer Level and auto rods/dumps.
    • Will not empty on Rx/Turbine Trip.
  • Program Level: 25% - 56.17% from 0 - 100%. Corresponds to Tave 557° - 585.3°F
  • Setpoints:
    • _​_92% Rx Trip
    • 70% High level Alarm
    • Lprogrammed +5%: High Deviation, energizes backup heaters.
    • Lprogrammed - 5%: Low Deviation
    • 17% Isolates Letdown & Trips PZR Heaters
17
Q

Pressure Control

  • Heater Banks: What each do, power supplies, power consumption
  • PZR Pressure Controller: Potentiometer setting, range, what it controls.
A
  • Heater Banks:
    • A Bank: Backup, 700 KW from PG21
    • B Bank: Backup, 700 KW from PG22
    • C Bank: Variable, 400 KW from PG24
  • PZR Pressure Controller:
    • 1700 - 2500 psig, 10 turn potentiometer => 80 psig/turn
    • 2235 psig nominal setting => 6.7 turns (nominal) setting
    • Controls:
      • Variable Heaters ± 15 psig
      • Spray starts opening + 25 psig; Spray full open + 75 psig
      • Backup on - 25psig; Backup off -17 psig
18
Q

RCS Chemistry

  • What chemicals are added to RCS? Why?
  • What are the RCS T/S Chemistry requirements?
A
  • Li7OH: pH Control
  • H2: Oxygen scavenging (hot)
  • Zinc: Prevents crud deposition
  • N2: Prevents O2 absorption in VCT when H2 not being used.
  • Boron: Chemical Shim
  • Hydrazine: Oxygen scavenging (Cold)
  • H2O2 (Hydrogen Peroxide): Causes chemical shock leading to crud burst (prior to refuel).

T/S

  • [O2] < 0.1 ppm (1.0 transient) every 72 hrs
  • [Cl-] < 0.15 ppm (1.5 transient) every 72 hrs
  • [F] < 0.15 ppm (1.5 transient) every 72 hrs
  • [H2] - every 72 hrs
19
Q

PRT

  • List the inputs
  • Alarm Setpoints (Hi level, Lo Level, Hi Temp, Hi Press)
A

Inputs

  • 2 PORVs
  • 3 Safeties
  • RHR Suction Relief
  • RCP Seal Return Relief (140°F)
  • CVCS Letdown Relief
  • Excess Letdown
  • Reactor Makeup Water
  • N2

Alarms

  • Hi Level: 81%
  • Lo Level: 64%
  • Hi Temp: 115°F
  • Hi Press: 6 psig
20
Q

RCS Leakage

  • State the differential allowable RCS Leakage Rates
A
  • No pressure boundary leakage
  • 1 gpm unidentified leakage
  • 10 gpm identified leakage
  • 150 gpd leakage thru any one S/G
21
Q

RCP Components and Cooling

  • State the purpose & Operation of:
    • Thermal Barrier Heat Exchanger
    • Flywheel
    • Anti-reverse rotation device
  • Which system(s) cool RCP components? Which do they cool?
  • RCP power supplies and ratings
A
  • Thermal Barrier H/X: Backup cooling supply to seal package
  • Flywheel: Increases inertia of RCP shaft to increase coastdown time to approximately 4 minutes to aide in decay heat removal.
  • Anti-Reverse Rotation Device: Pawls lower into contact w/ ratchet plate @ < 70 rpm, locks ratchet plate (flywheel) prior to shaft reversing direction. Reduces starting current by preventing reverse rotation.
  • Cooling:
    • CCW cools the motor air coolers, motor bearing oil coolers, and thermal barrier H/X
    • (CVCS) Seal injection cools seal package and pump bearing
  • Power Supplies:
    • ‘A’ RCP: PA0107
    • ‘B’ RCP: PA0108
    • ‘C’ RCP: PA0205
    • ‘D’ RCP: PA0204
  • Pump Ratings
    • _​_100,200 gpm @ 290 ft
    • 7000 HP, 6 Pole, 1200 RPM induction motor
22
Q

NI Fuses and Misc. Switches

  • High Flux @ S/D Block Switch
  • SR & IR Level Trip Bypass Switch
  • Power mismatch bypass switch
  • Rod Stop Bypass
  • Upper/Lower Section Defeat Swtiches
  • Comparator Channel Defeat Switch
  • Startup Rate Select
A
  • Block MCB & CTMT Alarm
  • Bloc SR Hi Flux / IR High Flux & Rod Stop
  • Removes a PR from auctioneering circuit to rod control and FRBV’s
  • Removes a failed detector from comparator & clears PR upper/lower deviation alarms
  • Removes channel from current comparator preventing alarm from channel
  • Selects which channel feeds SUR.
23
Q

BDMS

  • Operation
  • Setpoint
  • How to block
  • When can you block BDMS?
A
  • SR counts are averaged over one minute & compared to previous nine one-minute samples. If most recent exceeds any of the previous nine one-minute samples by 1.7x it sends a signal to the SSPS system to CVCS to:
    • Open BG-LCV-112D/112E (RWST Source for Charding)
    • Close BG-LCV-112B/112C (VCT Source for Charging)

** Either train signal will align both valves

  • Blocked by depressing block switch SE-HS-11 & SE-HS-12 (train specific) → causes 57B: SR Flux Doubled Byp/Blocked
  • Per T/S 3.3.9, BDMS can be blocked:
    • During subcritical physics testing.
    • M2 < P-6 and M3 during & prior to control bank withdrawal
    • M3 during and just prior to shutdown bank movement.
24
Q

Core Exit Thermocouples

  • How many, number of junction boxes
  • Range
  • OTA-RK-56B: RCS < 50°F Subcool
  • OTA-RK-56A: RCS Saturate
A
  • 50, 2 junction boxes, reference junctions monitored by RTDs.
  • 0°-700°F linear, can be used up to 2500°F for trending during accident.
  • CETCs use in EOPs for SI Termination Criteria
25
Q

MIDS

  • Uses of MIDS
  • Fission Chambers
  • How fission chambers positioned in core, including interlocks
  • How data used (where does it go?)
A
  • Uses:
    • Calculate Fuel Burnup Distribution
    • Detect/verify rods out of position
    • Calibrate NIs for ΔI (Axial Offset)
  • Detector positioned by cable driven drive motor into thimbles located in seal table into 58 locations in core. Position selected via a 6-path transfer device which feeds detector to one of 4 15-path transfer devices. → withdrawal limit switch stops detector from being pulled into drive wheel.
  • Data used in:
    • QPTR
    • Excore NI Calibration
    • Hot Channel Factor Measurements
    • PDMS (Beacon)
26
Q

Lower/Upper Head and Misc. Internal Components

  • Upper head penetrations & purpose
  • Lower head penetrations & purpose
  • Upper sealing & leak detection
  • Purpose of:
    • Lower Core Plate
    • Upper Core Plate
    • Former & Baffle Plates
    • Secondary Core Support Assembly
A
  • Upper (59 Total):
    • 53 CRDM
    • 4 incore T/C assemblies
    • 1 Rx Vessel Head Vent (RVHVS)
    • 1 Rx Vessel level Indication System (RVLIS)
  • Lower (58 Total):
    • Incore instrumentation thimbles.
      • Extend 12” into vessel
  • Sealing:
    • _​_Sealed by two O-Rings attached to head.
    • Leak Detection provided by tell tale drain b/w inner and outer o-rings that drains to RCDT w/ temp alarm @ 160°F (BB-TI-401).
      • If leakage detected, OTs enter containment to valve in good seal, and operation can continue on one seal.
  • Lower Core Plate:
    • _​_Supports fuel directly and distributes coolant via 4 holes under each assembly.
  • Upper Support Plate:
    • _​_Aligns & supports fuel and rod guide tubes.
  • Former and Baffles
    • _​_Outline periphery of core to make cylinder into square for fuel assemblies.
  • Secondary Core Support Assembly:
    • _​_Designed to catch lower internals assembly and fuel following failure of core barrel flange.
    • Max displacement ~ 1.25”
27
Q

Subcooling Monitor

  • Parameters used & number
  • All instruments for each train of SCMM
  • T/S LCO 3.3.3 PAMS requirements for CETC
A
  • Parameters:
    • _​_2 WR TH RTDs
    • 2 WR TC RTDs
    • 1 RCS WR Pressure (PT-403, PT-405)
    • 25 CETC
    • 3 T/C Reference Junction RTDs
    • 2 NR PPZR
  • ​Calculated Tsat based on lowest pressure and compares to highest RTD & TC.
  • T/S 3.3.3:
    • Requires 2 channels with 2 CETC each per quadrant of core.
    • 4 total per quadrant
    • Modes 1-3
    • Monthly OSP-SH-00001
28
Q

Rx Vessel Construction / Flowpaths

  • Design limitations / parameters
  • Nozzle sizing & features
  • Explain the flowpaths thru the vessel & % + purpose
A
  • 40 year lifetime, 2500 psia (2485 psig), 650°F, hydro pressure 3125 psia
  • Inlet nozzles are 27.5” diameter & tapered to reduce velocity entering Rx Vessel.
  • Outlet nozzles are 29” diameter and have bosses on inside surfaces that maet w/ outlet nozzles & lower internals to minimize bypass flows.
  • Flow: 96% for heat removal, 4% bypass flows:
    • Nozzle Bypass (1%): Water that flow from inlet to outlet due to small clearance b/w core barrel & outlet nozzle bypass.
    • Control Rod & Instrument Thimble Bypass (2%): Water goes into CR guide thimbles and instrument thimble @ bottom of fuel elements and flows out w/o removing heat.
    • Baffle Wall Bypass Flow (0.5%): Water passing up between inner perimeter of baffle wall and fuel elements.
    • Head Cooling Bypass Flow (0.5%): TC water passing up thru ports in the core barrel support and upper internals to cool head plenum.
29
Q

Pressurizer and Pressure Control (OTN-BB-00005)

  • Aux spray and spray ΔT requirements
  • Min Pressurizer Level
  • RCS/PZR boron effects from heater operation
  • RCS Degas (OTN-BB-00006)
    • [O2] limits
    • VCT pressure limit w/ RCPs secured
A
  • Aux spray actuation w/ ΔT > 320°F limited 10 cycles
  • Aux spray line emeergency use only with ΔT > 300 °
  • Spray ΔT shall not exceed 585°F
  • LPZR > 17%
  • B/U Heaters in service w/ RCS CB near peak value causes RCS boration/dilution different from predicted.
  • [O2] shall be < 3% when [H2] > 4% to prevent explosion
  • When RCPs are secured, VCT pressure < 5psig to minimzie gas buildup in head.
30
Q

RCS WR Pressure

  • BB-PT-403 / 405 / 406 inputs & purpose
A
  • BB-PT-405 (Red) & 403 (Yellow)
    • _​_Off Seal Table
    • Input to:
      • RVLIS
      • Subcooling Monitor
      • COMS
      • RHR Suction Interlock
        • BB-HV-8702 A/B: PT-403
        • EJ-HV-8701 A/B: PT-405
  • BB-PT-406:
    • Indication Only
31
Q

OTΔT and OPΔT

  • Inputs to each
  • Penalties
  • How runback works
A
  • OTΔT - 122.6% Nominal
    • ​Inputs:
      • Tave
      • PPZR
      • ΔI
    • Lowers If:
      • Tave > 585.3°F
      • Tave Rising
      • PPZR lowering < 2,235 psig
      • ΔI out of band
    • Rises If:
      • Tave Lowers
      • PPZR Rises > 2,235 psig
      • Tave < 585.3°F
    • Runback: 133% for 2.3s, waits 27.7 seconds.
  • OPΔT - 110.73% Nominal
    • ​Inputs:
      • Tave
    • Lowers If:
      • Tave > 585.3°F
      • Tave rising

** OPΔT ONLY LOWERS!!

32
Q

NR Temps (TC, TH, TAVE, ΔT)

  • ​Each temp’s range
  • Function of auctioneered high Tave
  • Function of auctioneered ΔT
  • Annunciator:
    • 66C-69C: Loop 1-4 Tavg HI Dev
    • 66D-69D: Loop 1-4 Tavg LO Dev
    • 65C: Auct Tavg HI
    • 65D: Tref/Tauct HI
    • 65E: Tref/Tauct LO
    • 66A-69A: Loop 1-4 ΔT HI Deviation
  • Annunciator 66B-69B: Loop 1-4 ΔT LO Deviation
A
  • TH: 530° - 650°F; TC: 510° - 630°F; Tavg: 530° - 630°F
  • Auct High Tave: Rod Control, Steam Dump Control, Pressurizer Level Controller
  • Auct High ΔT​: Rod Insertion Limit
  • Annunciators:
    • Tavg HI Dev: Tavg > 3° above Auct HI Tavg, WHEN defeated
    • Tavg LO Dev: Tavg > 3.5° below Auct HI Tavg for remaining loops.
      • If Tavg fails high, other 3 loops alarm will alarm until defeated.
    • Auct Tavg HI: Auct Tavg > 588.3°F
    • Tref/Tauct HI: Tref - Tauct > 3°F
    • Tref/Tauct LO: Tref - Tauct < -3°F
    • ΔT HI Dev: ΔT > 7.41% higher than Auct. HI ΔT for remaining loops WHEN defeated.
    • ΔT LO Dev: ΔT > 7.41% lower than Auct. HI ΔT fro the remaining loops.
      • If ΔT fails high, other 3 loops alarm until defeated.
33
Q

PZR Master Pressure Controller

  • How the Pressure Channel SS works (BB-PS-455F)
  • Potentiometer operation & PZR Range of Controller
  • Operation of Master Pressure Controller
A
  • Upper Selected → Master Controller (BB PK-455A)
  • Lower Selected → Alarms
  • 10 Turn Potentiometer, 1700 - 2500 psig range → 80 psig/turn
  • In Auto → normally 50% → Variable Heaters energized @ low power
    • As P↑, output ↓
  • In Manual → move controller the direction you want it to go.
    • For Boron equalization, turn on B/U Heaters and manually set controller to 40%
34
Q

PZR Level Controller

  • Which LT can be selected on BB LS-459D? (Lvl Control Selector)
  • Upper Selected Controls
  • Lower Selected Controls
A
  • LT-459 & 461 can be upper, 460 & 461 can be lower
  • Upper:
    • Control → BG-LCV_124(121) charging controller
    • ± 5% Deviation alarms
    • 17% Letdown isolation (BG-LCV-459 only)
  • Lower:
    • Hi Alarm (70%)
    • 17% Letdown isolation (BG-LCV-460 only)
35
Q

Rod Movement (1 Step) Sequence of Events

  • Withdrawal
  • Insert
A
  • Withdraw:
    • _​_SGC starts ON @ 4.4A
    • SGC current ↑ to 8A, MGC Turns ON
    • SGC turns OFF
    • Lift Coil Turns ON (Lifts Rod)
    • SGC Turns ON
    • LC & MGC OFF
    • SGC ↓ current to 4.4A
  • Insert:
    • _​_SGC starts ON @ 4.4A
    • SGC current ↑ to 8A, LC turns ON
    • MGC turns ON
    • SGC turns OFF
    • LC turns OFF (Drops Rods 1 Step)
    • SGC turns on @ 8A
    • MGC turns OFF, SGC ↓ 4.4A
36
Q

DRPI

  • How many steps per LED
  • How many LEDS for SD? For Control?
  • Accuracy of DRPI: Normally, Loss of Data A, Data B, & T/S 3.1.7
  • Rod Position Urgent Failure Indications/Causes
  • Rod Position Non-Urgent Failure Indications/Causes
  • Rod Position Deviation Causes
A
  • 6 steps per LED
  • Shutdown Bank:
    • Bottom, next 3 are 6 steps each, next (middle) on from 24 to 210 steps, last 4 are final 6 step increments (210, 216, 222, 228), and GW - 10 total
  • Control Bank
    • Bottom, 38 in 6 step increments from 0 to 228, GW - 40 Total
  • ±4 steps, +10/-4, -10/+4, ±12 from step counter
  • Flashing GW LED, Rod bottom LED; error in data, >6 steps Δ in data, sum of data > 228 steps.
  • Error in A or B LEDs, Flashign GW LED; Purity/Data Errors, Accuracy Mode switch not in A & B, Rod Dev Cards disagree or cards removed.
  • Any SD rod < 210 steps; Control Bank Rod > 12 steps Δ from any rod in that bank; RPI Urgent Alarm.
37
Q

RCP Operation (OTN-BB-00003)

  • Seal Leakoff operation < 100 psig RCS Pressure/Seal Injection to secured RCPs
  • Cooling RCP radial bearing and RCS temperature requirement
  • Precautions of seal injection not provided by NCP or if CCP is inoperable
  • RCP starting limitations following RCS Cooldown or heatup
  • Seal Injection throttle valve D/P limitations
  • RCP motor start/stop cycling limitations
A
  • Seal leakoff vavles should be closed w/ PRCS < 100 # and Seal injection maintained to prevent crud migration.
  • CCW established to Thermal Barrier H/X or Seal Injection established > 160°F to cool bearing.
  • If T> 220°F & CCP inoperable, seal injection should be from NCP. If NCP doesn’t provide seal injection, both CCW trains should be operating w/ service loop from train w/ non-operating CCP.
  • Starting Limits:
    • If starting RCP after cooldown by RHR > 20°F w/ no RCP running - draw bubble first
    • If RCPs stopped > 5 mins during H/U & TRCS > Tseal injection - draw bubble first.
    • If TRCS < 275°F, TSG shall be < 50°F above TC prior to starting RCP.
  • Max D/P of 1700 psid (erosion) across seal injection throttle valves.
  • Stop/Starts:
    • If motor did not acheive full speed → no restart for 30 mins
    • 2 starts allowed if RCP comes to stop between
    • 3 starts allowed if RCP has run 20 mins or been idel for 45 mins
    • If 3 starts/attempts in 2 hour period, 4th may be made after 1 hr idle.
38
Q

RCS Fill and Vent (OTN-BB-00001)

  • Definitions Of:
    • Limited Inventory
    • Lowered Inventory
    • Reduced Inventory
  • Max RHR Flow during vacuum fill
  • RCS P/T limits on venting
A
  • Limited: RCS Level < 110” but > 64” w/ fuel in RV
  • Lowered: RCS Level at or below flange w/ fuel in RV
  • Reduced: RCS Level < 64” (<3’ below flange) w/ fuel in RV
  • 2000 gpm max during vacuum fill to prevent vortexing RHR.
  • T < 175°F or Press < 100 psig
39
Q

Manual RCP Trip Criteria (OTO-BB-00002)

A
  • Frame vibs > 5 mils (If 3-5 mils & > 1 mil/hr = Trip)
  • Shaft vibs > 20 mis (If 15-20 mils & 2 mil/hr = Trip)
  • Seal Leakoff < 0.8 gpm or > 6 gpm
  • # 1 Seal & Bearing inlet temp > 230°F
  • Motor bearing temps > 195°F
  • Motor stator temps > 311°F
  • CCW lost to RCP motors > 10 minutes
  • Seal injection and CCW to Thermal Barrier H/X > 6 minutes

ILT 2022 (6 decks)

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