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Systems > Control Elment Drive Mechanism Control System (CEDMCS) > Flashcards

Control Elment Drive Mechanism Control System (CEDMCS) Flashcards

1
Q

What is CEDMCS used for ?

A

-Develops control voltage to withdraw, hold, or insert CEAs

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2
Q

What’re Control Element Assemblies(CEA), also known as control rods, used for?

A

Used to control fission rate of reactor power

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3
Q

What does CEDMCS allow CEA groups to compensate for reactivity changes ?

A

CEA movement controls:
-power in core
-variations in moderator temp & boron concentrations
-Dampens axial xenon oscillations

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4
Q

How does CEDMCS allow CEAs to drop into the core ?

A

CEAs drop into core upon interruption of power to Control Element Drive Mechanism(CEDM) Coil Stack

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5
Q

What system does CEDMCS send a signal too upon a reactor trip ?

A

-Main Turbine
-Feedwater control system
-Steam bypass control system
-Emerg. Response Facility Digital Acquisition Display System(ERFDADS)
-SRP Plant Multiplier

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6
Q

Why does CEDMCS provide signals for CEA positioning ?

A

CEA position is used as an indication to assure reactivity control has maintained plant within safety limits

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7
Q

What provide powers the Legacy CEDMCS system ?

A

Non-Class 480VAC Load Centers
-NGN-L03
-NGN-L10

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8
Q

What is the generators output voltage for the Legacy CEDMCS ?

A

Out out of generator is 240VAC that is sent through load contractor & circuit interrupters

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9
Q

What is the normal operation for the Legacy CEDMCS Motor generator set?

A

Both of the Motor Generators are operating in parallel

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10
Q

What does Reactor Protection System do for the CEDMCS system ?

A

Reactor Protection System will interrupt power going through Reactor Trip Switchgear Breakers deenergizing CEDMCS cabinets to trip reactor

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11
Q

What is a Power Switch Assembly used for on the Legacy CEDMCS ?

A

Rectifies 240VAC into 60VDC and sends it to Control Element Drive Mechanisms(CEDM) coil stacks in the associated subgroups

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12
Q

Where does CEDMCS accept CEA motion signals from ?

A

-Reactor Regulating System(RRS)for automatic control
-Operators module on board 4 manual control

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13
Q

What does the Power Switch Assembly do when it’s receives a CEA motion signal demand ?

A

PSA will supply appropriate power to the CEDM coils to either hold, withdraw, or insert CEAs

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14
Q

Where does CEDMCS receive demand control signals for CEA operations for Legacy CEDMCS ?

A

-Reactor Power Cutback system
-Plant Computer

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15
Q

What do the Legacy Motor Generator Sets do ?

A

Convert 480VAC power from NG system into 240VAC power from CEDMCS system

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16
Q

What is the generator rated at ?

A

-200kW
-240VAC
-60HZ
-601Amperes

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17
Q

What’re the Flywheels meant for on the Motor Generators ?

A

Provide rotational inertia for MG set during momentary transients

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18
Q

If MG set loses all power for 1 second, what’re the parameters it should maintain supplying full load?

A

-voltage shouldn’t decrease more than 5% below 240VAC
-Frequency shall not decrease below 58Hz

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19
Q

What set points do under voltage and under frequency relay initiate a MG trip ?

A

-Under voltage will trip at 210VAC
-Under frequency will trip at 57Hz

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20
Q

Why should both MG sets be running before moving CEAs?

A

They have to be running before CEAs are moved in:
-Auto Sequential
-Manual Group
-Manual Sequential

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21
Q

How is CEA motions limited to when only ONE MG set is operating ? Why must motion be limited ?

A

-Limited to Manual Individual to minimize potential of slipping or dropping rod

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22
Q

Whatre the controls in Square Black Line meant for on the each MG set control panel ?

A

The controls inside the square black line are meant to control the other MG set

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23
Q

What’re the controls located inside the MG set control panel ?

A

3 MG set overloads reset pushbuttons
-Motor Running Overload
-Motor Starter Overload
-Generator Running Overload
Two MG set high vibration resets located on each MG set

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24
Q

What should be done when there are a row of red alarm lights going across MG control cabinet ? How’re the red lights reset ?

A

Problem should be addressed via:
-Operating procedure
-Alarm Response Procedure

Pushbutton on each MG set control cabinet is for manually resetting local light and alarm input

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25
Q

What’re the two Voltage adjustment switches available on MG control Cabinet ?

A

-Automatic Voltage Adjust
-Manual Voltage Adjust

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26
Q

What is the difference when adjusting voltage for a single MG set & a MG set operating in parallel ?

A

-MG operating individually adjust generator output voltage indicated by voltmeter
-MG set operating in parallel are adjusted by sharing load indicated by ammeter on both control panels

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27
Q

What is the Motor Contactor ?

A

Pushbutton on MG set panel to start the motor

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28
Q

What is the Circuit Interrupter used for on the MG control panel ?

A

Manually operated circuit breaker for generator output

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29
Q

What is the Neutral interrupter used for on the MG control panel ?

A

Manually operated circuit breaker for Generator output neutral line

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30
Q

What is the Load Contactor used for on the MG control panel ?

A

A Pushbutton used to quickly open/close a contact inline with 240VAC circuit breaker

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31
Q

What is used for disconnecting/ connecting MG set to/from system besides the Circuit Interrupter ?

A

Load Contactor is rather used than manually operating Circuit interrupter

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32
Q

What will trip open the Load Contactor ?

A

-Generator Overload
-Under frequency @ 57Hz

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33
Q

What is the MG out put voltage for the ARCH system ?

A

Output voltage of the MG set is 240VAC

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34
Q

What is the normal operation between the two MG sets on the arch system ?

A

MG sets are operated in parallel

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35
Q

What is the 240VAC flow path ?

A

1.)240VAC output of MG set
2.)Goes through MG cabinet & output circuit breaker
3.)Then goes through parallel Reactor Trip Switchgear Breakers
4.)Then go to common 240VAC bus which is distributed through Coil Power Management Drawers

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36
Q

How many CPMDs does each disconnect switch supply ?

A

Each disconnect Feeds 3 Coil Power Management Drawers

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37
Q

Why does each CPMD have a disconnect ?

A

Each CPMD has a disconnect for isolation

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38
Q

What does each CPMD rectify 240VAC down to ?

A

CPMD rectifies 240VAC down to 60VDC to apply it to CEDM Coil

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39
Q

Where does CEDMCS Log Cabinet accept CEA motion demand signals ?

A

-Reactor Regulating system(RRS)for Automatic Control
-Ovation CEDMCS operators module in control room for Manuel control

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40
Q

Which subgroups receive signals from Reactor Power Cutback System ?

A

Subgroups 4,5,& 22

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41
Q

What do the Rod Drive Power Supply(RDPS) Motor Generator sets(MGs) provide to CEDMCS ARCH system ?

A

Supplies power to Advanced Rod Control Hybrid(ARCH) to operate CEDM which hold or move CEAs

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42
Q

Where do the RDPS MG receive there power supply from ?

A

NGN-L03 & NGN-L10 supply power

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43
Q

What is selective tripping function for the RDPS MG ?

A

-Ensures only one MG set is taken offline in event of a single failure
-Other set will be able to maintain power to CEDMCS
-Allows offline MG set to get repaired and to keep the plant online

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44
Q

Is a single MG set capable of operating & maintaining the ARCH system without any limitations?

A

Yes

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45
Q

Why does each MG set for the ARCH system have a Flywheel ?

A

-Provides rotational inertia for momentary transients

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46
Q

During a total loss of power to MG set for one second, what should the generator output voltage & frequency not drop below ?

A

-Output voltage shouldn’t drop below 5% below 240VAC
-Output frequency should not decrease below 58Hz while at full load

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47
Q

Where does Rod Drive Power Supply Control Cabinet receive its power from ?

A

-Supplied from non class 480MCC Dpanel at 120 VAC

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48
Q

Where does the 120VAC coming from RDPS Control Cabinet supply power to ?

A

-Backup 24VDC power supply
-Generator Field Flash Power Supply

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49
Q

What is the Backup 24VDC power supply used for in the RDPS Control Cabinet ?

A

-Rectifies 120VAC->24VDC
-Then supplies power to Critical & non-critical MG control circuits when MG set output breaker is open
-This allows control of system for startup before generator field is flashed

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50
Q

Where does Generator Field Flash Power Supply receive its power from ?

A

The RDPS Control Cabinet Power supplies 120VAC to Generator Field Flash Power Supply

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51
Q

What does the Generator Field Flash Power Supply do ?

A

-Rectifies 120VAC—>48VDC
-Provides power to voltage regulator for flashing of Generator Field

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52
Q

How is field flashing accomplished ?

A

Accomplished by Pushbutton on the front of the Control Cabinet

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53
Q

Once Generator field if flashed & generator output voltage is present what happens to the 24VDC power supply ?

A

-Switch will align output voltage to Backup 24VDC power supply
-A separate switch aligns power to primary 24VDC power supply

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54
Q

What happens to Backup 24VDC power supply if the MG set trips ?

A

If generator trips then switch realign back to external 120VAC power supply from RDPS Control Cabinet Power

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55
Q

Where does the auctioneered Primary 24VDC power & Backup 24VDC power supply to ?

A

Supply power to Critical & Non-Critical circuits that provides redundancy in case of failure

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56
Q

What’re non-critical components for the MG set ? (Failure won’t take system offline)

A

-HMI
-cRIO
-Ovation interface equipment
-MG set space heaters

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57
Q

What charges the MG output breaker closing spring charging motor ? When will it get charged

A

-Primary 24VDC Power Supply
-Closing springs will charged once generator field is flashed

58
Q

What is the 48VDC Field Flashing Power Supply used for ?

A

Used to apply voltage to Rotor Field Windings

59
Q

How long should the field flashing be held ? What happens if it takes longer ?

A

-Should not be held any longer than 2-3 seconds
-possible something may be wrong in the circuit if it takes longer

60
Q

What mode is the voltage relgulator in when only one MG set it running ?

A

It’s in isochronous mode to maintain constant output voltage regardless of load

61
Q

What mode is the voltage regulator when both MG sets are in parallel ?

A

Voltage regulator will be out into droop mode to help two MGs share reactive load equally

62
Q

When a voltage regular is operating in isochronous mode how is output voltage adjusted ?

A

Will be manually adjusted until it has a steady 240VAC coming out

63
Q

How is circulating current generated between Two paralleled MG sets ?

A

-Develops due to mismatch in output voltages and indicated by unequal reactive loading

64
Q

What is actually happening between Two MG sets when circulating current is happening ?

A

Mismatch voltages will send current from generator to the other which could cause excess heat damaging insulation

65
Q

What happens if circulating current gets to high ?

A

Could trick ground fault relay into thinking there is a ground fault and Trip the MG set

66
Q

What’re the requirements for closing MG set output breaker ?

A

-No fault,alarm,or trip
-must be closed on dead bus
OR
-Paralleled in sync with other MG set

67
Q

What will happen upon a Generator Ground Fault ?

A

-Generator protection relay will activate alarm
-Ground Fault Light will illuminate ground fault lamp
-will occur on both MG set cabinets

68
Q

How do you clear the Generator Ground Fault common trouble alarm on the MG set control cabinets ?

A

-Press the trouble reset Pushbutton
-Allows other alarms to announce problems when fixing Ground Fault alarm

69
Q

What must be done to the clear Ground Fault Flashing Light when the ground fault is corrected ?

A

Fault reset Pushbutton to clear alarm

70
Q

What is the Generator Protection Relay provide ?

A

Monitors critical parameters and determined when MG set output breaker can be closed

71
Q

What pushbutton controls does the MG set control cabinet have ?

A

-Motor start
-Motor stop
-Field Flash
-Generator Connect
-Generator Disconnect
-Trouble Reset
-Fault Reset
-Lamp Test

72
Q

With the space heaters switch in the ON position what will space heater do ?

A

-Energize when motor isn’t running
-De-energizes when motor is running

73
Q

Where are the Reactor Trip Circuit Breakers normally operated from ?

A

Manually operated from the control room

74
Q

What’re the Control Element Drive Mechanism(CEDM) used for ?

A

Physically interact with CEAs to hold or move based on command from CEDMCs

75
Q

What’re the two magnetic-jack mechanisms inside RCS pressure boundary ?

A

-Engage CEA drive shaft when magnetic field is generated
-Disengage CEA drive shaft when there’s no magnetic field

76
Q

What’re the Upper latches operated by ?

A

-Upper lift coil
-Upper latch coil

77
Q

What’re the lower latches operates by ?

A

-Lower lift coil
-Lower latch coil

78
Q

What’re the four multi bay cabinets used for ?

A

Contains equipment to provide power to coils of CEDM & CEDM magnetic jacks for holding/moving CEAs

79
Q

What does NN 120VAC provide to CEDMCS cabinet equipment operation ?

A

-Logic power supplies
-Relay Power supplies
-Aux.power supplies

80
Q

What does Normal Lighting(QA) supply power to into the CEDMCS cabinet ?

A

-Blowers
-Lighting
-Utility Outlets

81
Q

How many bays does each CEDMCS cabinet have ?

A

Contains 5 bays

82
Q

How many circuit breakers does each PSA have?

A

There are 4 circuit breakers one for each CEA in its subgroup

83
Q

What do the Subgroup Logic Cards do for PSAs?

A

PSAs supply rectifies DC power to CEDM coils based on signals from Subgroup Logic Cards

84
Q

What does continuous flashing mean for card status monitor lights & ACTM lights ?

A

Means there is an active problem with card

85
Q

What does several flashing lights with brief pause mean for the Card Status Monitor & amber ACTM lights?

A

Means there was an abnormality, but it no longer exists

86
Q

What is the row of 13 amber “Card Status Monitoring” indicating lights mean on the front of the CEDMCS cabinet ?

A

Correspond to Internal logic cards (1-15 ODD numbers only )

87
Q

What is the row of 8 amber indicating lights on front of CEDMCS panel ?

A

Corresponds to internal ACTM cards (Labeled A-H)

88
Q

What is the row of 8 red “Timer Failure” indicating lights on front of CEDMCS panel ?

A

Internal ACTM card(Labeled A-H)

89
Q

What is row of 4 red “continuous Gripper High Voltage” indicating lights for on front of CEDMCS panel ?

A

Correspond to logic cards of the same numbers (7,9,17,19)

90
Q

What do the 4 continuous Gripper High Voltage lights mean ?

A

Indicates corresponding Coil Driver Card has lost his Logic Supply Power & has failed to apply voltage to CEDM Upper Gripper Coil

91
Q

Where do all three Logic power supplies receive its power from? What is it rectified to ?

A

-NN 120 VAC
-rectified down to 10VDC

92
Q

Logic Power supplies PS1 & PS2 are auctioneered and powers what ?

A

-Logic & ACTM cards in Subgroup Logic Housing for respective CEDMCS cabinet
-PSA breaker indicating lights

93
Q

What happens when Subgroup Logic Housing Coil Driver Cards has low voltage ?

A

Will initiate “Continuous Gripper High Voltage” that’ll need to be corrected in 10 MINUTES

94
Q

What does the Aux. Power Supply(AUX PS) power ?

A

Internal components of the Power Switch Assembly

95
Q

How do you know if a Logic Power Supply fuse has been blown out ?

A

A amber covered light will illuminate

96
Q

What does the Relay Power Assembly contains ?

A

-Two relay power supplies(PS1 & PS2)
-One analogue voltmeter for each power supply
-On/Off indicating light for each power supply
-7 fuses

97
Q

Where do both relay power supplies receive power from ? What does it get rectified down to ?

A

-NN 120VAC
-Rectified down to 24VDC

98
Q

What do relay power supplies provide power to ?

A

-Under voltage detectors
-Cabinet temperature sensors & alarm circuits

99
Q

How many blowers does each cabinet bay have ?

A

Has two blowers intake blower at bottom and exhaust blower on top

100
Q

What is the breaker panel on left of entryway supplies 120VAC instrument power to ?

A

Logic Power Supplies
Relay Power Supplies

101
Q

What is the breaker panel on rear access door to CEDMCS cabinet right of the entry way supply Normal Lighting to ?

A

-Intake blower
-Exhaust Blowers
-Internal lighting
-Internal utility outlets

102
Q

What is Hold Bus Power Supply used for ?

A

Subgroup transferred to hold bus when there is control circuitry malfunctions(Logic Cards or Logic Power Supply )

103
Q

What is in upper panel of the Hold Bus Control & Indicator Panel ?

A

Four bus under voltage test switches that test operation of common 240VAC bus undervoltage detectors

104
Q

What happens if you activate any of these test switches in the upper panel ?

A

Will illuminate local red light & annunciate alarm in control room

105
Q

What happens when you activate both switches simultaneously ?

A

Will trip reactor and signal rest of plant to respond accordingly

106
Q

What is the lower panel used for on the Hold Bus Control & indication panel ?

A

-Thumbwheel subgroup selector used to select which subgroup to transfer to hold bus

107
Q

What is the Transfer Switch used for in the Lower Panel of the Hold Bus Control & indication panel ?

A

Applies power from Hold Bus Power supply to selected subgroups upper gripper coils

108
Q

If a subgroup transferred to the hold bus which gripper coil will it transfer to ?

A

Originally subgroup power supply uses Upper gripper coil
Hold bus transfer will use Lower Gripper Coil

109
Q

What does the Reset Toggle switch do for the Hold Bus Power Supply ?

A

Disconnects Hold Bus Power Supply from the selected subgroup Upper gripper coils and restores normal power supply to subgroup

110
Q

What’re the three CEA Relay Interface Housing Cards ?

A

-One card interfaces Reactor Power Cutback & CEDMCS
-Other two provide up-count & down-count signals for each increment of CEA motion to plant computer

111
Q

What is the 18 red “cooling failure” LEDS meant for in the advisory panel ?

A

Indicates overheating condition exits for specific cabinet and bay

112
Q

What is the row of 13 RED CEDMCS Status LEDs in the Supervisory Panel ?

A

Indicate CEDMCS is operating under restricted or abnormal conditions

113
Q

What is the bottom row of 12 red”Shutdown Group Disable” indicate on the Supervisory panel ?

A

-Indicates that corresponding shutdown Group Disable switch has been set to disable
-These switches are used for testing during startup

114
Q

What are the 14 red “group motion” LEDS indicating on the sequential Reset Panel ?

A

Indicates corresponding group sequencer is operating

115
Q

What is totalizer panel assembly used for ?

A

Totalizeer is used on each CEA assembly advances one count every time it’s CEA is raised or lowered one step

116
Q

What’re the Automatic CEDM Timer Module used for ?

A

ACTM cards control sequencing of coil voltages to CEDM in order to insert or withdrawal

117
Q

Where does ACTM cards receive their digital inputs from ?

A

They’re received from other circuits within CEDMCS & in response controls CEDM, which in the end controls CEAs

118
Q

What does the ACTM card monitor for each CEDM coil ?

A

-Prevent CEA drop & slip
-Prevent CEDM coil burnout
-Provide up & down count signals for accurate CEA position monitoring
-Prevent CEA group deviations

119
Q

When will the ACTM card automatically transfer CEA to alternate gripper ?

A

-High Voltage
-Inadequate holding current

120
Q

What happens if there is movement of CEA when there isn’t supposed to be ?

A

There will be a LG/UG transfer is initiated to transfer the CEDM to other gripper

121
Q

What is the new gripper hold feature of the CPMD?(ARCH)
What does this new feature provide that the old legacy system didn’t ?

A

-If there is a fault in upper gripper then it auto engages lower gripper
-This eliminates the need for a hold bus to provide an alternate power source to UG to prevent Rod drops

122
Q

Where is power to operate CPMD come from ?

A

NN 120VAC from NNN-D11 & NNN-D12

123
Q

What power normally powers Ovation controllers? What is the backup power to ovation ?

A

-Receives normal power from NN 120VAC
-Receives backup power from a UPS Battery Backup to help with transients

124
Q

How long does each UPS provide power for Ovation during a LOOP ?

A

-Provides 4 minutes with Max ovations loads
-Provides 13 mins with normal loading until DG start and supply the MCC

125
Q

How does NN Dpanel supply two drawers within each CPMD?

A

NNN-D11 supplie UL & UG drawers
NNN-D12 supplies UG & LL drawers
Dpanel are auctioneered to supply backup power for each other on a loss of power

126
Q

What is the Ovation Interface used for ??

A

-Used to manually move CEA from control room
-Automatic motion commands from Reactor Regulating Systems(RRS)

127
Q

What do the Ovation Controllers send to the ARCH coil Power Management Drawers ?

A

They send required command signals to perform CEA movement

128
Q

What’re the normal automatic features for the CEDMCS ?

A

Reactor Regulating System can automatically move Regulating Groups to control RCS temp within band

129
Q

What initiates a Reactor Power Cutback ?

A

-Main Turbine Load Rejection
-Main Feedwater Pump Trip

130
Q

What subgroups do CEDMCS automatically drop during a reactor power cutback ?

A

4,5,& 22

131
Q

What happens on a loss of power to a single CEA ?

A

Will result in that single CEA drop into core

132
Q

What happens on a loss of power to a PSA ?

A

Would result in associated PSA subgroup to drop all its rods

133
Q

How does CEDMCS interface with 480VAC LoadCenter NG ?

A

-Provides power to Legacy MG sets
-Provides power to Rod Drive Power Supply MG set
-Provides 120VAC from a NG Dpanel to CEDMCS cabinet internal lighting,utility outlets, & cooling fans

134
Q

How does CEDMCS interface with NN ?

A

-Provides power to Logic Power
-Relay Power Supplies
ARCH:
-Coil Power Management Drawers( CPMD)
-Ovation Controllers

135
Q

How does CEDMCS interface with 120VAC Instrument power (PN) ?

A

-PN provides power to CEDMCS Aux. Cabinets
-PNC & PND provide power to ovation control room Thin Clients

136
Q

How does CEDMCS interface with Aux Building HVAC(HA) ?

A

-CEDMCS room air handling units provide cooling to CEDMCS cabinets
-CEDMCS room temp should be between 55-104

137
Q

How does CEDMCS interface with Containment Building HVAC (HC) ?

A

CEDM Normal Air cooling units provide cooling to CEDM coils and CEA reed switch position transmitters

138
Q

How does CEDMCS interface with SRP plant Multiplexer ?

A

CEDMCS provides SRP plant multiplexer a signal when reactor has tripped

139
Q

How does CEDMCS interface with Main Turbine ?

A

CEDMCS sends undervoltage relay provide signal to Main Turbine to trip Turbine on a Reactor Trip

140
Q

What signals does CEDMCS send to Digital Feedwater Control following a reactor trip ?

A

-Downcomer and Economizer Feedwater Control Valves Closed
-Downcomer Feedwater Control Valves throttled into SG based on reactor coolant temp
-This design it to prevent overcoolinh RCS following a Reactor Trip

141
Q

What happens on a loss of NGN-L17 or NGN-D03 to CEDMCS cabinet ?

A

-Cabinet cooling fan
-internal lights
-Utility outlets

Systems (62 decks)

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