NIS/RPS

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skrappie1
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NIS/RPS
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2016-01-04 15:51:59
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NIS RPS advanced systems
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NIS/RPS
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  1. Purpose of M-coil arc suppressors?
    • Suppresses voltage spikes due to the magnetic field collapse in the coil when the M-contacts open
    • -this prevents fusing contacts in the matrix relay
  2. How do we detect grounds in the clutch power supply control power circuits, clutch AC power supply circuits and matrix logic ladders?
    Detected by lamp pairs, if you have a ground, 1 lamp will brighten, 1 will go dark
  3. What do M coils M1-M4 in the RPS system do?
    • When deenergized by RPS logic ladder contacts they open contacts to deenergize the CRDM clutches
    • Need a loss of 1 M coil on each side for a reactor trip.
  4. Clutch DC power supplies?
    • Clutch DC bus 1
    • -clutch power supply 1 (from Y-30)
    • -clutch power supply 3 (from Y-40)
    • Clutch DC bus 2
    • -clutch power supply 2 (from Y-30)
    • -clutch power supply 4 (from Y-40)
  5. EK-06C4 "channel deviation level 2 10%"
    • Quadrant power tilt of 10% at 100% power
    • Check incores
  6. LCO 3.2.4: Axial Shape Index
    LCO 3.2.4: The ASI shall be within the limits specified in the COLR

    APP: Mode 1 with thermal power >25%
  7. LCO 3.2.2: Total radial peaking factor (FRT)
    LCO 3.2.2: FRT shall be within limits specified in the COLR

    APP: Mode 1 with thermal power >25% RTP

    NO </= 1 HOUR ACTIONS
  8. NI inputs to RPS
    • PR NIs
    • -VHPT
    • -TM/LP
    • -disabling loss of load trip
    • -generator coastdown trip

    • WR NIs
    • -high rate of change trip
    • -disables zero power trip bypasses >10-4%
  9. LCO 3.9.2: Nuclear Instrumentation
    LCO 3.9.2: 2 source range channels shall be operable

    APP: Mode 6

    • Actions:
    • A.1 Source range channel inoperable
    • -suspend core alts-immediately AND
    • -suspend positive reactivity additions-immediately

    • B. 2 source range channels inoperable
    • -initiate action to restore one source range channel to operable status-immediately
  10. LCO 3.2.1: Linear Heat Rate
    LCO 3.2.1: LHR shall be within the limits specified in the COLR, and the incore alarm system or excore monitoring system shall be operable to monitor LHR

    APP: Mode 1 with thermal power >25% RTP

    • ACTIONS:
    • A. LHR, as detected by the auto incore alarm system, not within limits specified in COLR, as indicated on 4 or more coincident incore channels OR
    • LHR, as detected by the excore monitoring system, not within COLR limits OR
    • LHR, as detected by manual incore detector readings, not within limits specified in the COLR
    • -Restore LHR to within limits-1 hour
  11. Function and operation of the PR NI comparator/averager?
    • Accepts buffered output from the summer circuit in each PR channel, averages it with the signals from the other 3 units.
    • Output is returned to each channel drawer and compared to each channel signal via 2 deviation comparators
    • Determines deviation between the channel and the average
    • Serves as indication of Quadrant Power Tilt Ratio
    • Outputs to a bistable causing "Channel Deviation Alarm" at:
    • -5% or 10% on front of the NI drawer
    • -alarm on C-06 EK-06-03/04 RACK C
  12. LCO 3.3.9: Neutron Flux Monitoring Channels
    LCO 3.3.9: 2 channels of neutron flux monitoring instrumentation shall be operable

    APP: Modes 3,4,5

    • Actions:
    • 1 or more required channels inoperable
    • -suspend all operations involving positive reactivity additions-Immediately
  13. EK0917 "Rod Withdrawal Prohibit"
    • 2/4 VHP pre-trip
    • -minimum 28.5%
    • -variable 1.5% below VHPT setpoint(or 13.5% above last power level that the VHPT was reset)
    • -max 105.0%

    • 1/4 High PWR rate pre-trip
    • -1.5 DPM when reactor power is > 10-4%RTP and <15%

    Removal/Failure of RPS bistable high power rate pre-trip/trip below 15% RTP

    EM off
  14. What ranges of power do SR/WR/PR NIs cover?
    • SR covers 6 decades from 0.1 to 105 cps (10-10 to 10-4% power)
    • WR covers 10 1/3 decades, from 10-8 to 200% power
    • PR covers 0-125% power
  15. Which NIs supply which RPS channels?
    • WR channel NI-03
    • -RPS channels A and C
    • WR channel NI-04
    • -RPS channels B and D
  16. SR/WR NI power supplies?
    • NI-1/3A
    • -Y-30
    • NI-2/4A
    • -Y-40
  17. What must be done if the SPI/HOST system is inoperable in Mode 1 > 25% RTP?
    PO-3 "Alternate Incore and Excore application" must be performed and actions of T.S. and ORM
  18. Power supplies for PR NIs?
    • NI-5
    • -Y-10
    • NI-6
    • -Y-20
    • NI-7
    • -Y-30
    • NI-8
    • -Y-40
  19. EK-0971 "SPI trouble"
    • Brought in by the watchdog timer
    • Check PPC page 900 "PPC network system status"
  20. What is cold leg shadowing?
    • As T decreases, density increases therefore it reflects more neutrons back into the core therefore indicated power goes down
    • Typically 0.5% power/degree F
    • Compensate by periodic excore calibration
  21. How many incore NIs do we have? What are they used for?
    • 36 strings
    • -5 detectors each string
    • -180 total
    • Rhodium-103 detectors
    • Used for
    • -LHR
    • -peaking factors
    • -incores can be used as a backup to PR NIs for quadrant power tilt
    • -determines target AO, which is used to develop target ASI
    • -allowable power level
    • -ASI measured by the PR NIs is calculated with the AO determined by the incores
  22. PR NI summer
    • Sums output of the upper and lower amplifier
    • Outputs to:
    • -control rod drop detection circuit
    • --compares immediate signal level with a time delay (8 sec) signal level
    • --8% drop in under 8 seconds-dropped rod alarm
    • -15% bistable trip unit
  23. Consequences of incorrectly performing CL-35, neutron monitors system checklist?
    Can result in NI channels remaining inoperable, which can reduce redundancy of protective channels and cause entry into tech specs
  24. When must SOP-35 ATT 1 "Heat Balance Verification" be performed?
    • If heat balance differs by more than 2% from
    • -any indicated nuclear power channel on the C-27 digital meters or the TMM "status" screen OR
    • -any indicated delta T power channel on any TMM "Primary" screen
  25. EK-06C8 "NI Channel Trouble"
    • Trip setting
    • -PR detector high voltage </= 675V
    • -SR/WR-deviation of 15VDC from setpoint or </= 410VDC
    • -HS-0102E in AHSP position
    • Check detector voltage NI-5/6/7/8 > 650VDC
    • Check "non-oper" light is lit on neutron flux monitor
  26. Purpose of Excore Nuclear Instruments?
    • 8 channels of instrumentation
    • -2 SR, 2 WR, 4 PR
    • Monitors neutron flux from the source range through 125% power
    • Provides signals used to process a reactor trip if any core safety limit is approached
    • -SUR directly to RPS
    • -VHPT via TMM to RPS
    • -TM/LP via TMM to RPS
  27. Effects of loss of Y-10/Y-20 between 10-4%-15% power?
    Generates a rod withdrawal prohibit alarm due to the reciept of one of four RPS channel high power rate pre trip bistables
  28. What instrumentation is normally used to monitor core Linear Heat Rate (LHR)?
    SPI node in conjunction with the host computer for the PPC (incores)
  29. Effect of a loss of a preferred AC bus on the excore NIs?
    • Loss of a bus will disable 1 PR channel
    • Loss of Y-30 or Y-40 will disable 1 SR/WR channel
  30. LCO 3.2.4: Axial Shape Index (ASI)
    LCO 3.2.4: The ASI shall be within the limits specified in the COLR

    APP: Mode 1 with thermal power >25%

    NO </= 1 HOUR ACTIONS
  31. EK-06C3 "Channel Deviation Level 1 5%"
    • Quadrant power tilt of 5% at 100% power
    • Check incores
  32. How is gamma discrimination accomplished in SR/WR? What is campbelling mode?
    • Both use a pulse height discriminator
    • Campbelling used for WR at and above approximately 106cps(5X10-3% power)
    • -measures the amount of current
    • -will see a step up or step down between .05% to.10% indicated power
  33. Purpose of Incore Nuclear Instrumentation?
    • Provides measured data that may be used in evaluating the neutron flux distribution in the RX core
    • Contains thermocouples, 16 of which are post-LOCA environmentally qualified
    • Data may be used to evaluate thermal margins and to estimate local fuel burnup
    • Used to calibrate excores with respect to ASI/LHR
  34. How many Excore NIs do we have?
    • 8 channels
    • -2 SR
    • -2 WR
    • -4 PR
  35. Relationship between SR and WR NIs?
    When SR is approximately 3 cps, WR should read approximately 1X10-7%
  36. Advantages/disadvantages of rhodium detectors (incores)?
    • Advantages
    • -very accurate
    • -self powered
    • -can be read manually
    • -reads precise flux throughout the core for an accurate LHR

    • Disadvantages
    • -slow response time(nearly 4 minutes to respond)
    • -t1/2 for Rh-104 is approximately 42 seconds
  37. Effects of a loss of Y-30 or Y-40 between 10-4-15% power?
    • RWP alarm
    • Also Rx trip on high power rate due to the loss of NI-1/3 or 2/4
    • Above 15%, only loss of Y-40 generates a RWP alarm
    • -PR NI-8 generates the signal that bypasses the high power rate (SUR) channel pre-trip at 15% power. If Y-40 is lost you lose this removal therefore the high power rate trip and pre-trip will activate the RWP alarm
  38. PR NI 15% bistable trip unit does?
    • Enables/bypasses the wide range channel high power rate trip below/above 15% full power
    • Enables/bypasses the loss of load trip above/below 15% full power
    • Loss of load trip not needed <15% and rate trip not needed below 10-4% or when in the power range where coefficients limit the rate
    • Resets low power block to allow ASI alarm in the TMM >15% RTP
    • Enables low power block to defeat the ASI alarm <14.5% RTP
    • Generator coastdown trip
    • -enabled when both NI-5 and NI-6 15% bistables are >15% RTP
  39. How long must you wait before resetting RPS?
    • 30 second lockout
    • -prevents ratcheting damage
    • -ensures rods remain free to drop
  40. What is the purpose of the reactor protective system?
    • Designed to initiate a Rx trip whenever any one of several monitored parameters or conditions deviates from a pre-selected operating range.
    • -the monitored parameters and conditions, and their allowable operating ranges ensure that the tech spec safety limits are not exceeded
    • -thus, RPS protects the reactor from damage that could occur if a tech spec safety limit was exceeded
  41. What is the design feature that prevents more than one trip unit for a monitored parameter from being placed in bypass at the same time?
    1 keyswitch for each trip which is captured when you place the bypass switch in bypass
  42. EK-06B4 "Hi pressure pressurizer channel trip" and pre-trip?
    • PZR pressure 2235 psia
    • 2/4 logic give you a reactor trip
    • Pre-trip at 2185 psia
  43. When should ATWS be bypassed?
    With 1 PCS pressure sensor failed high, the ATWS trip shall be bypassed
  44. What are the ATWS power supplies?
    • Pressure switches are powered from Y-10-40
    • ATWS matrix relays powered from lighting panels L58 and L59
    • 2/4 logic matrix actuation and relay ATWS1 are powered from Y-230, which is fed from battery D-204
  45. How many aux trip units are there per RPS channel?
    4
  46. EK-06A1 "Variable high power level channel trip"
    • 1/4
    • Minimum 30% reactor power
    • Variable-15% above power level at which the trip was reset
    • Maximum of 106.5%
    • 2/4 gives a reactor trip
    • Maintains margin to DNB
  47. What effect will a single ground have on the RPS?
    none
  48. EK-06D6 "Rate trip channel enabled"
    • WR NI above 10-4% and PR NI <15% power
    • Rate trip auto enabled when WR NI >10-4% RTP
    • Rate trip is automatically bypassed when PR NI power rises to >15%
  49. What type of trip unit only accepts a trip or not-tripped signal?
    Auxiliary trip unit
  50. What is the design of the RPS trip units?
    • Bistable trip units
    • -PCS low flow
    • -S/G low level X2
    • -S/G low pressure X2
    • -PZR high pressure
    • -Thermal margin/low pressure

    • Auxiliary trip units
    • -Rx high power (VHPT)
    • -Rx power high rate of change (SUR)
    • -Loss of load
    • -CHP
  51. EK-06A8 "Low level SG1 channel pre-trip"
    EK-06B5"Low level SG2 channel pre-trip"
    • 31% S/G level
    • 2/4 logic
    • -AFAS at 30%
  52. How is the RPS trip logic affected when a trip unit is placed in trip?
    The logic is changed from 2/4 to 1/3
  53. EK-06B2 "Lo pressure SG1 channel trip"
    EK-06B3 "Lo pressure SG2 channel trip"
    • S/G pressure 512 psia
    • Rx trip 2/4
  54. When is the ATWS trip actuated?
    Actuated by PZR pressure greater than or equal to 2375 psia on a 2/4 logic
  55. What effect will 2 grounds have on the RPS?
    Components that are between the grounds will be deenergized.
  56. Why should RPS trip unit red matrix lamps be replaced as a planned work activity?
    Due to the potential for a shorted bulb to trip both auctioneered 28 VDC matrix ladder power supplies and cause a plant trip.
  57. EK-06D2 "Loss of load channel trip channel bypassed"
    • Any 1 of 4 PR NI channels </= 15% RTP
    • Automatically removed >15% power rising
  58. How do you remove a trip unit from bypass?
    • Turn key 90o
    • Verify yellow light goes out
    • Remove key
    • Record in Rx logbook or the procedure
  59. EK-06B6 "Lo pressure SG1 channel pre-trip"
    EK-06B7 " Lo pressure SG2 channel pre-trip"
    570 psia S/G pressure
  60. How do you place a RPS trip unit in a tripped condition?
    • Loosen hold down screws
    • Pull trip unit out atleast 2 inches
    • Ensure connections on the back of the unit are disengaged
    • Record in reactor logbook
  61. EK-06D1 "Zero power mode bypass"
    Any 1 of 4 ZPM bypass keyswitches in the "bypass" position with wide range NI <10-4% power
  62. What is the basis for the high startup rate trip?
    Minimizes transients for events such as a continuous control rod withdrawal or a boron dilution event from low power levels
  63. How do you remove a RPS trip unit from tripped?
    • Insert unit flush
    • Tighten screws
    • Reset trip unit and verify the trip lamp is not lit
    • Record in logbook or procedure
  64. What is the RPS trip logic when a trip unit is placed in bypass?
    • Logic changes from 2/4 to 2/3
    • Get a yellow light above the keyswitch for the parameter that is bypassed
  65. What electrical bus powers the turbine trip logic?
    ED-205 (D-21-1)
  66. What type of trip unit accepts a measured parameter value and compares it to a setpoint?
    Bistable trip unit
  67. What are the Low S/G pressure RPS trip and pre-trip setpoints?
    • Pre-trip at 570 psia
    • Trip at 512 psia
  68. What are the high pressurizer pressure trip and pre-trip setpoints?
    • Pre-trip at 2185 psia
    • Trip at 2235 psia
  69. How do you determine if a RPS input parameter is satisfying 2/4 Rx trip logic?
    • Trip signals illuminate red lights on the units front panels
    • Annunciators
  70. EK-06A4 (06B1) "Low level SG1(SG2) channel trip"
    • 28% S/G level
    • Rx trip on 2/4
  71. EK-06C1 "TM/Lo pressure channel trip" and pre-trip setpoints?
    • Variable with 1760 psia minimum
    • Setpoints are generated by the TMM
    • Rx trip 2/4 logic
    • Pre-trip is 50 psia higher than the trip
  72. What is the RPS single failure vulnerability?
    • High failure of a wide range NI at low power levels when high rate of change of power trip is not automatically bypassed
    • -this is single failure because 1 WR NI feeds 2 channels of RPS
  73. What do the RPS logic matrices do?
    • The matrix logic consists of 6 logic matrices (logic ladders). Each ladder compares the trip unit outputs from 1 RPS channel to the trip unit outputs from another RPS channel.
    • 6 matrix combinations
    • -AB
    • -AC
    • -AD
    • -BC
    • -BD
    • -CD
    • A trip of 1 logic ladder trips the reactor
  74. Which internal RPS power supply loss results in all matrix red lights illuminating for that channel?
    300 VDC bulk power supply
  75. What devices interface between the matrix logic ladders and the trip initiation logic? How many per channel?
    4 matrix relays per channel which interface between the matrix logic ladders and the trip initiation logic
  76. What is the power supply for the ATWS logic matrix?
    Y-230A(ED-204)
  77. What are the power supplies for the ATWS matrix relays?
    1E lighting panels L58 and L59
  78. What are the 4 major functional segments to RPS?
    • Measurement (or sensor) channels
    • RPS trip units
    • Matrix logic
    • Trip initiation logic
  79. What are the 2 automatic trip unit bypasses?
    • Loss of load
    • -bypasses when <15% reactor power
    • --allow Rx startup
    • -bypasses automatically removed at >15% reactor power

    • High rate of change or reactor power
    • -bypassed <10-4% and >15% reactor power
    • -bypassed removed between 10-4% and 15%
    • --below 10-4% startup level noise could cause an inadvertent trip
    • -->15% reactivity feedback effects from Tmod, Tave limit SUR, so the trip is not needed
  80. What conditions does RPS initiate a trip on?
    • RX high power
    • Rx power high rate of change
    • PCS low flow
    • S/G low level
    • S/G low pressure
    • PZR high pressure
    • Thermal margin/low pressure
    • Loss of load
    • Containment high pressure
  81. LCO 3.3.1 RPS instrumentation
    LCO 3.3.1: 4 RPS trip units, associated instrumentation channels, and associated ZPM bypass removal channels for each function in Table 3.3.1-1 shall be operable

    APP: According to Table 3.3.1-1

    • Actions:
    • -D. 1 or more ZPM bypass removal channels inoperable
    • --remove affected ZPM bypass-IMMEDIATELY
    • --declare affected trip units inoperable-IMMEDIATELY

    • -E. 1 or more functions with 2 RPS trip units or instrument channels inoperable
    • --Place the trip unit in trip within 1 hour
    • --not applicable to ZPM bypass removal function
  82. How to manually remove the ZPM bypass?
    • Ensure each of the 4 bypassed trip functions in the channel is in a non tripped condition
    • Turn key counterclockwise and remove
    • Test ZPM removal by testing 2 lights/channel
  83. How do we reset RPS?
    • Ensure no Rx trip signal is present
    • Ensure ATWS is properly aligned
    • Ensure RPS breakers are reset and closed
    • Reset the reactor by pushing the reactor reset button on C-02
  84. What 2 RPS trips are based on less than 2/4 logic when their sensor channels are considered?
    • High power rate (1/2)
    • Loss of load (2/3)
  85. How do you verify RPS is properly reset?
    • Verify EK-0972 "Reactor trip" clears
    • Verify proper RPS response on panel C-06
    • -all 24 matrix relays are energized as indicated by their indication lamps and each lamp is equally illuminated
    • -all 4 arc suppression network voltmeters indicate approximately 20 volts
    • -red "trip" lamp goes dark on all 4 clutch power supply panels
    • -white "DC on" and "AC on" lamps illuminate on all 4 clutch power supply panels
    • -amber "DC trouble" and "ground" lamps illuminate on all 4 clutch power supply panels
  86. What is the basis for the low S/G pressure trip?
    • Provides protection against an excessive rate of heat extraction from the S/Gs, which would result in a rapid uncontrolled C/D of the PCS
    • Provides a mitigation function in the event of a MSLB
  87. When must SOP-35 7.2.5 "calibrating delta T power indication channels" be done?
    • Whenever heat balance power differs by more than 1% from:
    • -any indicated delta T power channel on any TMM "primary" screen
    • -if calibration is desired
  88. EK-06C6 "Containment Hi pressure trip"
    • 3.7 psig
    • Pre-trip at 3.4 psig (no alarm, white light only)
    • Rx trip on 2/4 logic
  89. What is an anticipated transient without scram (ATWS)?
    A situation in which the reactor protective system fails to trip the reactor upon reciept of a trip signal resulting from an anticipated operational occurance
  90. What is the basis of the containment high pressure trip?
    Provides a reactor trip in the event of a loss of coolant accident or main steam line break
  91. Why doesn't the RPS have an auto reset?
    • Prevents ratcheting damage that could occur if clutches were reenergized before the rods dropped to the fully inserted position
    • Also ensures the rods remain free to drop.
  92. How do the 2 manual reactor trip pushbuttons in RPS differ from each other and the auto trip function?
    • Manual reactor trip pushbutton 1 (C-02)
    • -deenergizes all 4 M-coil relays deenergizing the 4 clutch power supplies
    • Manual reactor trip pushbutton 2 (C-06)
    • -deenergized the undervoltage coil on the reactor trip breakers 42-1/RPS and 42-2/RPS, interrupting the voltage from Y-30 and Y-40 to the power supplies
    • Auto trip function
    • -deenergizes M-coils similar to the button on C-02
  93. Zero power mode bypass
    • Manual bypass used to bypass certain Rx trips when control rods must be withdrawn when the Rx is S/D and preserve S/D margin
    • Bypasses
    • -PCS low flow
    • -S/G low pressure
    • -Thermal margin/low pressure
    • 1 keyswitch for each channel (4 total)
    • ZPM bypass auto removed >10-4% RTP
  94. What is the basis for the low S/G level trip?
    It trips in the event of an excessive steam demand (to prevent overcooling of the PCS) and loss of feedwater events (to prevent overpressurization of the PCS)
  95. When must SOP-35 7.2.4 "calibrating power range nuclear indication channels" be performed?
    • If heat balance differs by >1% from
    • -any indicated nuclear power channel on C-27 digital meters (preferred) or the TMM "status" screen OR
    • -if calibration is desired
  96. What is the basis for the high pressurizer pressure trip?
    In conjunction with pressurizer safety valves and main steam safety valves it provides protection against overpressure conditions in the PCS when at operating temperature.
  97. When should a RPS trip unit be placed in a tripped condition?
    • If a RPS instrument channel input becomes erratic
    • If its output value is questionable
    • If an RPS instrument channel is inoperable

    should either bypass or put in trip
  98. EK-06A6 "high power rate channel pre-trip/ASI"
    • High power rate
    • -WR NI trips the bistable at 1.5 dpm
    • -only effective between 10-4% and 15% power
    • ASI
    • -TMM bistable trips when ASI is within 0.011 ASI units of COLR limit
    • -only if Rx power is >15%, at less than 25% the ASI limit is not applicable and no action is required
    • Auto action
    • -rod withdrawal prohibit on high power rate pre-trip only
  99. What is the basis for the loss of load trip?
    Prevents lifting the PZR and main steam safety valves in the event of a turbine generator trip while at power.
  100. How long may ATWS be bypassed?
    7 days per SOP-36
  101. EK-06C2 "loss of load channel trip"
    • Turbine aux relays 305-L and 305-R
    • -auto stop oil <45 psig 2/3 logic
    • -turbine thrust >/= 40 mils
    • -either MSIV not fully closed
    • -ATWS as sensed by 2/4 PZR pressures >2375 psia
    • Trip blocked below 15% RTP
    • Rx trip on 2/4 logic
  102. How do you place ZPM bypass in operation?
    • Ensure operable both WR NIs
    • Ensure power level >10-4%
    • Verify PCS boron concentration >cold S/D concentration
    • Insert key in switch and turn clockwise
    • Press each of the 4 testbuttons and verify none of the 8 lamps lit
  103. How do you clear a RPS input signal that is preventing RPS from being reset?
    If not bypassed, then trip signals must be cleared by correcting the condition in the field
  104. EK-06A7 "Low flow channel pre-trip"
    Bistable trips when flow signal drops to 97% of nominal flow measured with all 4 PCPs operating
  105. Basis of the thermal margin/ low pressure (TM/LP) trip
    Provided to prevent reactor operation when the DNBR is insufficient, the TM/LP trip protects against slow reactivity or temperature increases, and against pressure decreases.
  106. EK-06A3 "Low flow channel trip"
    • 96% of nominal flow measured with 4 PCPs operating
    • Rx trip on 2/4 logic
  107. What are the conditions requiring a manual reactor trip?
    • The safety of the reactor is in jeopardy
    • Parameters exceed any of the RPS setpoints and auto actions did not occur
    • S/D is required to protect personnel, equipment, or the public
    • If it is warranted by unusual circumstances
  108. What lights in the RPS play a dual role of indicating relay status and ground detection?
    The matrix relay lights
  109. What are the RPS power supplies?
    • Channel A
    • -Y-10
    • Channel B
    • -Y-20
    • Channel C
    • -Y-30
    • Channel D
    • -Y-40
  110. How do you bypass a RPS trip unit?
    • Insert keyswitch
    • Turn 90o
    • Verify yellow light is lit
    • Record in Rx logbook unless recorded in the procedure
  111. LCO 3.2.3 Quadrant Power Tilt (Tq)
    • LCO 3.2.3: Tq shall be </= 0.05
    • APP: Mode 1 with thermal power >25%
  112. Why should the ZPM bypass test buttons be operated one at a time?
    Prevents RPS trips due to the voltage drop
  113. What is the basis for the low primary coolant system flow trip?
    Provides DNB protection during events that reduce PCS flow rate.
  114. EK-06A2 "High power rate channel trip"
    • WR NI bistable trips when power rise rate of 2.6 dpm or greater is sensed
    • Trip is effective only between 10-4% power and 15% power
    • Rx trip on 2/4 logic
  115. What are the RPS trips?
    • VHPT
    • RX power high rate of change
    • PCS low flow
    • S/G low level X2
    • S/G low pressure X2
    • PZR high pressure
    • Thermal margin/low pressure
    • Loss of load
    • Containment high pressure
  116. What are the 3 types of trip unit bypasses in the RPS?
    • Trip channel bypass
    • Automatic bypass
    • Zero power mode bypass
  117. What is the basis for the variable high power trip?
    • Provides protection against positive reactivity excursions
    • Designed to limit the maximum reactor power to its maximum design and to terminate power excursions initiating at lower powers without power reaching this full power limit.
  118. LCO 3.3.2: Rx protective system (RPS) logic and trip initiation
    LCO 3.3.2: 6 channels of RPS matrix logic, 4 channels of RPS trip initiation logic, and 2 channels of RPS manual trip shall be operable.

    • APP: Modes 1 and 2
    • -Modes 3,4, and 5 with more than 1 full length control rod capable of being withdrawn and PCS boron < refueling boron concentration

    • Actions:
    • -B. 1 channel of trip initiation logic inoperable
    • --deenergize the affected clutch power supplies-1 hour
    • D. 2 channels of trip initiation logic affecting the same trip leg inoperable
    • --deenergize the affected clutch power supplies-IMMEDIATELY
  119. What are the 6 functions of the RPS "k" relays?
    • CRDM rundown
    • Prevents RPS auto reset
    • Blocks RPS manual reset for 30 seconds
    • Trips the turbine
    • Actuates the "Reactor Trip" alarm
    • Sends "reactor is tripped" input to the PPC
  120. What are the outputs for PR NI linear amplifiers?
    • PPC via an aux output
    • C-06 0-125% power
    • TMM for calculation of Axial Offset (ASI)
    • Summer
    • Comparator/averager
  121. What is the design basis for the ATWS trip?
    • ATWS is designed to provide diverse and independent means to accomplish the following actions when a failure of the RPS is sensed.
    • -trip the reactor
    • -trip the main turbine
  122. When is trip channel bypass for RPS to be used?
    • When a trip unit must be physically removed from the system.
    • To prevent an inadvertent Rx trip when a trip unit is being serviced or calibrated.
    • To temporarily remove a trip unit from service when either it or its instrument channel is inoperable
  123. What lights can be used to detect grounds on the RPS trip initiation logic?
    • Power supply 1 or 2 "ground"
    • Power supply 1 or 2 "AC trouble"
  124. LCO 3.3.1 RPS instrumentation
    actions for one or more functions with 2 RPS trip units or associated instrument channels inoperable
    • NOTE: not applicable to ZPM bypass removal function
    • Actions: Place one trip unit in trip-1 hour
  125. LCO 3.3.1: Rx Protective System (RPS) instrumentation
    LCO 3.3.1: 4 RPS trip units, associated instrument channels, and associated zero power mode (ZPM) bypass removal channels for each function in Table 3.3.1-1 shall be operable.

    • APP: According to Table 3.3.1-1
    • Note: Seperate condition entry is allowed for each function
  126. LCO 3.3.1: Rx Protective System (RPS) instrumentation
    Actions for one or more ZPM bypass removal channels inoperable
    • Remove the affected ZPM bypasses
    • -IMMEDIATELY OR
    • Declare affected trip units inoperable
    • -IMMEDIATELY
  127. EK-06D3/4/7/8, “NUCLEAR – ∆T POWER DEVIATION/ T-INLET OFF NORMAL/CALCULATOR TROUBLE CHANNEL A, B, C, D”
    • 1) Alarms incorporate a time delay of up to 8 seconds.
    • 2)Trip Setpoint
    •   a) Nuclear Delta-T: 3% Deviation
    •   b) Tc Max: 543.5°F
    •   c) Tc Min: 525°F
    •   d) Calculator Trouble: Internal Error Logic

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