MS Flashcards
• A Primary Coolant Pump trip has caused a reactor trip at 100% power.
• All systems functioned as designed upon the reactor trip.
Immediately following the reactor trip, what is the position of the following valves?
ADV / TBV / Code Safeties
A. closed open open
B. open closed closed
C. closed closed open
D. open open closed
D. open open closed
• A Primary Coolant Pump trip has caused a reactor trip at 100% power..
• All systems functioned as designed upon the reactor trip.
• During EOP 1.0, CV-0501 and CV-0510, Main Steam Isolation Valves, were
inadvertently closed.
• MO-0501 and MO-0510, Main Steam Isolation Valve Bypass valves are closed.
Which of the following conditions describes the ACTUAL PCS heat removal
mechanism following completion of EOP 1.0 actions?
ADVs
A. Open and removing heat
B. Open and removing heat
C. Open but not removing heat
D. Open but not removing heat
Turbine Bypass Valve Open but not removing heat Open and removing heat Open and removing heat Open but not removing heat
ADVs
A. Open and removing heat
Turbine Bypass Valve
Open but not removing heat
Given the following plant conditions:
• The plant is in MODE 3 following a reactor trip from 100% power.
• PCS temperature is being controlled with the Turbine Bypass Valve in AUTO.
• The Atmospheric Steam Dumps are closed with the Steam Dump Controller,
HIC-0780A, in AUTO.
• The Average Temperature Display Select Switch is in the LOOP 2 position.
Which of the following describes the effect of a loss of the Tave signal from TYT -0200
(e.g., signal failed LOW) on the plant. (Assume NO operator action has been taken.)
A. The only means of PCS heat removal with the secondary plant is via the Main
Steam Code Safety valves.
B. The Turbine Bypass Valve fails closed and will NOT open until the Average
Temperature Display Select Switch is placed in LOOP 1 position.
C. The Turbine Bypass Valve fails closed and will NOT open. the ADVs will open on a
quick open signal.
D. The TBV will modulate open/closed to maintain S/G pressures at setpoint. The
ADVs will NOT modulate open.
D. The TBV will modulate open/closed to maintain S/G pressures at setpoint. The
ADVs will NOT modulate open.
Given the following plant conditions:
• The plant is in the process of shutting down.
• The crew is using the Atmospheric Dump Valves (ADVs) and Turbine Bypass
Valve (TBV) for heat removal.
• The NCO-R is using the ADV controller HIC-0780A in Manual.
• The NCO- T observes the Turbine Bypass Valve indicates open, but that Turbine
Bypass Valve Controller PIC-0511 output meter indicates NO output signal.
• Main Condenser vacuum is 15” and slowly lowering.
• Instrument Air pressure is 95 psig and stable.
Which one of the following accounts for these conditions, and what action, if any, is
required?
A. ADV controllers at Panel C-33 (HIC-0780B/0781 B) are in Manual. They should be
restored to Auto.
B. ADV controllers at Panel C-33 (HIC-0780B/0781 B) are in Auto. They should be
placed to Manual.
C. PIC-0511 is malfunctioning and should be reported to I&C for troubleshooting.
D. These conditions are normal per equipment design; no action is necessary.
D. These conditions are normal per equipment design; no action is necessary.
Given the following conditions:
- The plant is in MODE 3 following a reactor trip from 100% power.
PCS temperature is being controlled with the Turbine Bypass Valve in AUTO
- The Atmospheric Steam Dumps are closed with the control room C-02 panel
Steam Dump Controller, HIC-0780A in AUTO
- The Average Temperature Display Select Switch is in the LOOP 2 position
Which of the following describes the effect of a loss of the Tave signal from TYT-0200
(e.g., signal failed LOW) on the plant. (Assume NO operator action has been taken.)
A. The only means of PCS heat removal with the secondary plant is via the Main
Steam Code Safety valves.
B. The Turbine Bypass Valve fails closed and will NOT open until the Average
Temperature Display Select Switch is placed in LOOP 1 position.
C. The Turbine Bypass Valve fails closed and will NOT open. The ADVs will open on
a quick open signal.
D. The TBV will modulate open/closed to maintain S/G pressures at setpoint. The
ADVs will NOT modulate open.
D. The TBV will modulate open/closed to maintain S/G pressures at setpoint. The
ADVs will NOT modulate open.
CORRECT - The Turbine Bypass Valve controls on either the dump control
error signal OR main steam pressure signal, whichever is highest; therefore
TBV operation for these conditions is relatively unaffected. For the ADVs,
losing the Tave signal disables auto operation of the ADVs.
Given the following conditions:
- The plant is in MODE 3 following a reactor trip from 100% power.
PCS temperature is being controlled with the Turbine Bypass Valve in AUTO
- The Atmospheric Steam Dumps are closed with the control room C-02 panel
Steam Dump Controller, HIC-0780A in AUTO
- The Average Temperature Display Select Switch is in the LOOP 2 position
Which of the following describes the effect of a loss of the Tave signal from TYT-0200
(e.g., signal failed LOW) on the plant. (Assume NO operator action has been taken.)
A. The only means of PCS heat removal with the secondary plant is via the Main
Steam Code Safety valves.
B. The Turbine Bypass Valve fails closed and will NOT open until the Average
Temperature Display Select Switch is placed in LOOP 1 position.
C. The Turbine Bypass Valve fails closed and will NOT open. The ADVs will open on
a quick open signal.
D. The TBV will modulate open/closed to maintain S/G pressures at setpoint. The
ADVs will NOT modulate open.
D. The TBV will modulate open/closed to maintain S/G pressures at setpoint. The
ADVs will NOT modulate open.
CORRECT - The Turbine Bypass Valve controls on either the dump control
error signal OR main steam pressure signal, whichever is highest; therefore
TBV operation for these conditions is relatively unaffected. For the ADVs,
losing the Tave signal disables auto operation of the ADVs.
Given the following: • A Primary Coolant Pump trip has caused a reactor trip at 100% power. • Preferred AC Bus Y-10 de-energized at time of reactor trip • All systems functioned as designed upon the reactor trip. Immediately following the reactor trip, what is the position of the following valves? ADVs A. Closed B. Open C. Closed D. Open TBV Open Closed Closed Open S/G Code Safeties Open Closed Open Closed
ADVs
A. Closed
TBV
Open
S/G Code Safeties
Open
Loss of Y-10 = no ADVs.
- A plant shutdown is in progress.
- P-8B, Auxiliary Feedpump is in service providing. feed to the S/Gs.
- The Turbine Bypass Valve is maintaining S/G pressure at approximately 900#
- A malfunction has caused both CV-0501 and CV-0510, Main Steam Isolation
Valves to close. - Neither MO-0501 and MO-0510, Main Steam Isolation Valve Bypass valves, have
been opened. - Assuming no Operator action, what is the status of PCS heat removal?
AFW Status / PCS Heat Removal via
A. P-8B in service / TBV
B. P-8A in service / Code Safeties
C. P-8B in service / ADV
D. P-8A in service / ADV
C. P-8B in service / ADV
• Plant has tripped from 100% power.
• Both CV-0501 and CV-0510, Main Steam Isolation Valves, were closed during
EOP 1.0 actions.
• Both MO-0510 and MO-0501, Main Steam Isolation Valve Bypass Valves are
closed.
Assuming plant systems are responding as expected to the above conditions, PCS
temperature is being controlled by the:
A. Atmospheric Steam Dump valves.
B. Turbine Bypass Valve.
C. S/G Code Safeties.
D. Hogger.
A. Atmospheric Steam Dump valves.
Which of the following describe a location in the main steam piping that, if broken,
would directly affect the steam supply line to turbine driven AFW Pump P-8B?
A. Downstream ‘A’ S/G MSIV, CV-0510
B. Between main steam line and manual isolation for ADV for ‘A’ S/G, CV-0781
C. Downstream ‘B’ S/G MSIV, CV-0501
D. Between main steam line and manual isolation for ADV for ‘B’ S/G, CV-0780
B. Between main steam line and manual isolation for ADV for ‘A’ S/G, CV-0781
The plant is operating at 100% power when an electrical transient results in a turbine
trip and loss of 125V Bus D11-1.
What is the position of the Atmospheric Steam Dump Valves (CV-0779, 0780, 0781,
and 0782) and Turbine Bypass Valve (CV-0511) immediately following the trip?
0511, 0779, 0780, 0781, and 0782
A. o o o o o
B. x x x x x
C. o o x o x
D. x x o x o
D. x x o x o
Y-01, Instrument AC, has been de-energized. Which of the following Main Steam
components are affected by this power loss?
A. Main Steam Isolation Valve Bypass Valves
B. Turbine Bypass Valve
C. Atmospheric Steam Dump Valves
D. Main Steam Isolation Valves
B. Turbine Bypass Valve
The plant is operating at 100% power when an electrical transient results in a turbine
trip and loss of 125V Bus D21-1.
What is the position of the Atmospheric Steam Dump Valves (CV-0779, 0780, 0781,
and 0782) and Turbine Bypass Valve (CV-0511) immediately following the trip?
0511, 0779, 0780, 0781, and 0782
A. o o o o o
B. x x x x x
C. o o x o x
D. x x o x o
C. o o x o x
Given the following conditions:
• A plant shutdown from 100% power was initiated due to steam leakage on a pipe
weld for MV-MS646, Pressure Tap (located just upstream of TBV CV-0511).
• During the shutdown, a fault developed on 125V DC Bus D21-1 which was
subsequently de-energized.
• The Control Room Supervisor directs the NCOs to trip the reactor and close the
MSIVs to isolate the leak.
• After tripping the reactor, the NCO identifies ‘B’ MSIV, CV-0501 valve position
indicating lamps are extinguished.
• The indicating lights for CV-0510, ‘A’ MSIV, valve position and DC power available
light are illuminated.
How can the NCO close ‘B’ MSIV CV-0501?
A. Push the Containment High Radiation Initiate Push Button on the C-13 panel.
B. Select the close position on ‘B’ MSIV CV-0501 control switch.
C. Select the close position on ‘A’ MSIV CV-0510 control switch.
D. Push the Turbine Trip Pushbutton on the C-02 Panel.
C. Select the close position on ‘A’ MSIV CV-0510 control switch.
• The plant is being cooled down using the Atmospheric Steam Dump Valves
(ADVs).
• Main Steam Isolation Valves (MSIVs) are closed.
• HIC-0780A, Steam Dump Controller, is in MANUAL with a 10% output signal.
• PIC-0511, Turbine Bypass Valve (TBV) Controller is in AUTO.
The expected control board valve position indications for the ADVs and the TBV are:
ADVs
RED light GREEN light
TBV
RED light GREEN light
A. off on off on
B. off off off on
C. on on off off
D. off off on on
B. off off off on
• Plant is being cooled down using the Atmospheric Steam Dump Valves (ADVs).
• Main Steam Isolation Valves (MSIVs) are closed.
• HIC-0780A, Steam Dump Controller, is in MANUAL with a 30% output signal.
• PIC-0511, Turbine Bypass Valve (TBV) Controller is in AUTO.
• Main Turbine backpressure is 4” and rising.
The expected control board valve position indications for the ADVs and the TBV are:
ADVs
RED light GREEN light
TBV
RED light GREEN light
A. off on off on
B. off off off on
C. on on off off
D. off off on on
D. off off on on
Which of the following describes the locations where Atmospheric Steam Dump Valves
can be controlled?
A. Control Room and C-150
B. C-150 and Panel C-33
C. Control Room and Panel C-33
D. Control Room and locally in CCW Room Upper Level
C. Control Room and Panel C-33
Which ONE of the following pairs of conditions will automatically close the Main Steam
Isolation Valves (MSIVs)?
A. Containment High Pressure (CHP) OR S/G Low Level.
B. Safety Injection Actuation (SIAS) OR S/G Low Level.
C. Containment High Pressure (CHP) OR S/G Low Pressure.
D. Safety Injection Actuation (SIAS) OR S/G Low Pressure.
C. Containment High Pressure (CHP) OR S/G Low Pressure.
Which ONE of the following is correct concerning the Atmospheric Steam Dump
Valves?
A. The Atmospheric Steam Dump Valves are prevented from automatic opening until
a turbine trip signal is received.
B. The Atmospheric Steam Dump Valves will quick open when the PCS temperature
error signal reaches 20°F (TAVE at 552°F).
C. The Reactor Regulating System sends an auctioneered TAVE signal to the
Atmospheric Steam Dump Valve controller.
D. Following the quick opening of the Atmospheric Steam Dump Valves, the valves will
modulate to maintain 900 psia on the main steam header.
A. The Atmospheric Steam Dump Valves are prevented from automatic opening until
a turbine trip signal is received.
The reactor was shutdown 4 hours ago. The plant is cooling down using the Atmospheric Steam Dump Valves (ADVs). The Main Steam Isolation Valves (MSIVs) have been closed. A Nuclear Control Operator notes that the Turbine Bypass Valve
(TBV) CV-0511 is indicating throttled open. The demand signal on the turbine bypass valve controller is at 0 output and the Main Steam header pressure is indicating 800 psia. Which of the following describes the status of the TBV, CV-0511, and what action should be taken?
A. The TBV is operating as expected; no action is needed.
B. The TBV is operating as expected; it should be taken to manual and closed to avoid
water hammer.
C. The TBV should be closed; a work request should be generated to evaluate the
problem.
D. The TBV should be closed; it should be taken to manual and closed.
A. The TBV is operating as expected; no action is needed.
The reactor was tripped 40 minutes ago due to an Excess Steam Demand Event. The
Main Steam Isolation Valves (MSIVs) have been closed and the faulted steam
generator has been isolated. The plant is being stabilized using the Atmospheric
Steam Dump Valves (ADVs) on the non-faulted steam generator. An NCO notes that
the Turbine Bypass Valve (TBV), CV-0511, is throttled open with no output signal
indicated on the controller. Which of the following describes the status of the TBV,
CV-0511, and the action that should be taken?
A. The TBV is operating as expected; no action is needed.
B. The TBV is operating as expected; it should be taken to manual and closed to avoid
water ham mer.
C. The TBV should be closed; a work request should be generated to evaluate the
problem.
D. The TBV should be closed; it should be taken to manual and closed.
A. The TBV is operating as expected; no action is needed.
Which one of the following describes the design of the Main Steam Isolation Valves
automatic closure logic for a Main Steam Line Break inside containment?
A. EITHER Steam Generator pressure lowers to 500 psia AND Containment pressure rises to 4 psig.
B. BOTH Steam Generator pressures lower to 500 psia AND Containment pressure rises to 4 psig.
C. BOTH Steam Generator pressures lower to 500 psia OR Containment pressure rises to 4 psig.
D. EITHER Steam Generator pressure lowers to 500 psia OR Containment pressure rises to 4 psig.
D. EITHER Steam Generator pressure lowers to 500 psia OR Containment pressure rises to 4 psig.
Given the following plant conditions:
• The plant was at full power when the Reactor tripped.
• Atmospheric Dump Valve (ADV) controller, HIC-0780A, is in AUTO.
• Turbine Bypass Valve (TBV) controller, PIC-0511, is in AUTO.
• Main Condenser vacuum has reduced to 4”.
• Instrument Air system pressure has reduced to 20 psig and is stable.
Which one of the following describes the response of the ADVs and the TBV, and what
action will the operators take for PCS heat removal?
A. BOTH the TBV and the ADVs will close; operators will take action to remove PCS
heat using the Hogging Air Ejector
B. BOTH the TBV and the ADVs will close; operators will take action to remove PCS
heat using the once-through-cooling-method
C. ONLY the TBV will close; operators will take action to remove PCS heat using the
ADVs
D. ONLY the ADVs will close; operators will take action to remove PCS heat using the
TBV
C. ONLY the TBV will close; operators will take action to remove PCS heat using the
ADVs
Given the following plant conditions:
• The plant was at full power when the Reactor tripped.
• Atmospheric Dump Valve (ADV) controller, HIC-0780A, is in MANUAL.
• Turbine Bypass Valve (TBV) controller, PIC-0511, is in AUTO.
• Main Condenser vacuum has reduced to 15”.
• Instrument AC Bus Y01 is de-energized.
• The in-service TAVE/TREF Controller has fails high.
Which one of the following describes the response of the ADVs and/or the TBV?
A. TBV will fail closed and the ADVs will fail closed
B. TBV will fail closed and the ADVs will fail open
C. ONLY the TBV will fail closed
D. ONLY the ADVs will fail open
B. TBV will fail closed and the ADVs will fail open
The plant is operating at rated power with all control systems in automatic and Tave at
560°F, when a Main Turbine trip occurs. Which ONE of the following statements
describes the expected response of the Atmospheric Steam Dump Valves (ADVs) and
the Turbine Bypass Valve (TBV)?
A. ADVs quick open and remain full open until Tave reaches 540°F, where they are
fully closed; if any ADV fails to open, TBV responds like an ADV.
B. ADVs quick open and modulate closed as Tave approaches 532°F; TBV modulates
open when Tave exceeds 572 of.
C. ADVs quick open and modulate closed as Tave approaches 535°F; TBV quick
opens and modulates closed as main steam pressure approaches 895 psia.
D. ADVs and TBV quick open if Tave exceeds 55rF, and modulate closed together
as main steam pressure approaches 895 psia.
C. ADVs quick open and modulate closed as Tave approaches 535°F; TBV quick
opens and modulates closed as main steam pressure approaches 895 psia.
Which one of the following statements describes the expected response of the
Atmospheric Steam Dump Valves (ADVs) and the Turbine Bypass Valve (TBV)
immediately following a reactor trip with the following initial conditions?
• Reactor power = 60%
• TAVE = 548°F
A. ADVs Quick open and modulate closed and are full closed when TAVE is = 540°F;
TBV Quick opens and modulates closed as S/G pressure approaches 895 psia.
B. ADVs Quick open and modulate closed and are full closed when TAVE is = 535°F;
TBV Quick opens and modulates closed as S/G pressure approaches 895 psia.
C. ADVs modulate open and are full closed when TAVE is = 535°F;
TBV modulates open and modulates closed as S/G pressure approaches 895 psia.
D. ADVs modulate open and are full closed when TAVE is = 540°F;
TBV modulates open and modulates closed as S/G pressure approaches 895 psia.
C. ADVs modulate open and are full closed when TAVE is = 535°F;
TBV modulates open and modulates closed as S/G pressure approaches 895 psia.
The Main Steam Isolation Valves automatically close when …
A. EITHER Steam Generator pressure lowers to 500 psia AND Containment pressure
rises to 4 psig.
B. BOTH Steam Generator pressures lower to 500 psia OR Containment pressure
rises to 4 psig.
C. BOTH Steam Generator pressures lower to 700 psia OR Containment pressure
rises to 4 psig.
D. EITHER Steam Generator pressure lowers to 500 psia OR Containment pressure
rises to 4 psig.
D. EITHER Steam Generator pressure lowers to 500 psia OR Containment pressure
rises to 4 psig.
The following conditions exist:
• The plant tripped from 100% power five minutes ago.
• Both MSIVs are closed.
• Relay 386 AST did not actuate when the turbine tripped.
• All other equipment functioned as designed.
Assuming no Operator action, what is the approximate PCS cold leg temperature?
A. 532F
B. 535F
C. 545F
D. 552F
C. 545F
Given the following conditions:
• The plant was at full power when BOTH Cooling Tower Pumps tripped.
• The plant was then manually tripped.
• Main Condenser vacuum is now at 311 and lowering.
• An undetermined malfunction has rendered ALL Atmospheric Dump Valves
inoperable.
Assuming NO operator action, what is PCS Cold Leg temperature at approximately ten
minutes after the plant trip?
A. 532F
B. 535F
C. 545F
D. 552F
C. 545F
The following conditions exist:
• The plant tripped from 100% power ten minutes ago.
• Both MSIVs are open.
• Relay 386 AST did not actuate when the turbine tripped.
• All other equipment functioned as designed.
Assuming no Operator action, what is the approximate pcs cold leg temperature?
A. 532F
B. 535F
C. 548F
D. 552F
A. 532F
Given the following conditions:
• Plant is operating at 100% power
• I&C has inadvertently caused Atmospheric Dump Valve CV-0781 to go fully
open while working on the control circuitry
Which of the following describes the RPS pre-trip that will be first-out in response to
this event?
A. Variable High Power.
B. TM/LO Pressure.
C. High Power Rate.
D. LO Pressure SG1 and/or SG2.
A. Variable High Power.
One ADV = about 30/4 = 7.5% (at 900 psia) design steam flow rate, but will be worth less at 700 psia (100% power steam pressure): net effect is higher power.
VHP pretrip/trip set at 105/106.5.
Following a refueling outage, the plant is in a Chemistry Hold at 35% power, when the Turbine Bypass Valve CV-0511 fails open. Assuming no operator action and no change in turbine load, what is the approximate final steady state reactor power level? A. 31% B. 35% C. 39% D. 43%
C. 39%
a.) Candidate erroneously subtracts the 4% from initial power level.
b.) Incorrectly believes TBV steam load is not significant enough to cause a change in
power.
c.) CORRECT. The TBV accounts for steam flow equivalent to -4% power.
d.) Incorrectly doubles TBV 4% load and adds to initial power level.
Given the following conditions:
• The reactor is at approximately 3% power, making preparations to roll the Main Turbine.
• The TBV is being operated and is currently approximately 60% open.
Which of the following describes the plant response if the TBV were to spuriously open
fully?
MS Pressure / PCS Temp / Rx Power
A. lowers lowers rises
B. lowers rises lowers
C. rises lowers lowers
D. rises rises rises
A. lowers lowers rises
The plant is at 100% power.
A small steam leak has developed on the ‘B’ S/G main steam line immediately
upstream of the MSIV.
Heat Balance Power Steady shows a rise of approximately 0.5% load.
Which of the following best describes the effect of this steam leak on plant operation
and the actions Operators are directed to take to mitigate its effect?
A. PCS temperatures lower. Reactor power rises. Operators lower Turbine load to
restore reactor power and PCS temperatures to pre-event levels.
B. PCS temperatures rise. Reactor power rises. Operators lower Turbine load to
restore reactor power and PCS temperatures to pre-event levels.
C. PCS temperatures lower. Reactor power lowers. Operators lower Main Turbine
load to restore TAVE and TREF to pre-event levels.
D. PCS temperatures rise. Reactor power lowers. Operators lower reactor power with
control rods to restore TAVE and TREF to pre-event levels
A. PCS temperatures lower. Reactor power rises. Operators lower Turbine load to
restore reactor power and PCS temperatures to pre-event levels.
A. Correct. Steam load has risen. PCS temperatures lower. Negative moderator
temperature coefficient results in reactor power rise to meet steam demand.
ONP-9 directs Operators to lower Turbine load if steam leak is 1% load as seen on HB Power Steady, trip the reactor.
Given the following conditions:
• Following a plant trip, the NCO inadvertently closes both MSIVs.
• PCS temperature is stable at 526°F.
• ADVs are closed with SG pressures at 840 psia.
If all ADVs were unavailable (e.g. will not open), the PCS temperature would rise and
stablize at approximately:
A. 532F
B. 535F
C. 545F
D. 556F
C. 545F
Given the following conditions:
- The Plant is at 100% power.
- Alarm EK-0966, “MAIN STEAM ISOLATION VALVE UNDERVOLTAGE” has
annunciated in the Control Room.
Which one of the following may be used by the NCO to verify this alarm is valid?
A. Check Channel ‘A” Thermal Margin Monitor is de-energized.
B. Check MSIV position indication not available on C-01 panel.
C. Check Core Matrix light indications not lit on C-12 panel.
D. Check MCC-3 voltmeter reading zero volts on C-04 panel.
B. Check MSIV position indication not available on C-01 panel
- Alarm EK-0966, “MAIN STEAM ISOLATION VALVE UNDERVOLTAGE” has
annunciated in the Control Room.
Select the item that may be used by the NCO to validate that this alarm is valid.
A. Check EK-0543, “Preferred AC Bus No 1 Trouble” alarm annunciated.
B. Check EK-0547, “125V DC Bus Ground” alarm annunciated.
C. Check Bus 1A and Bus 1B “Control Power Available” lights on C-04 panel.
D. Check MSIV Bypass valve position indication lights are out on C-01 panel.
D. Check MSIV Bypass valve position indication lights are out on C-01 panel.
• The plant is at 100% reactor power.
• Due to a failure of the input to PIC-0511, Turbine Bypass Valve controller,
CV-0511, Turbine Bypass Valve (TBV), has been closed by placing PIC-0511 in
MANUAL with a zero output signal.
• HIC-0780A, Steam Dump controller is in AUTO.
• An Auxiliary Operator is being briefed on isolating the TBV manually.
• The TBV is not isolated yet.
How does this impact operation of the plant if a reactor trip were required?
A. Both the ADVs and the TBV Quick Open. Only the ADVs will modulate open/closed.
B. Only the ADVs Quick Open. Both the ADVs and the TBV will modulate open/closed.
C. Only the ADVs Quick Open. Only the ADVs will modulate open/closed.
D. Both the ADVs and the TBV Quick Open. Both the ADVs and the TBV will modulate open/closed.
D. Both the ADVs and the TBV Quick Open. Both the ADVs and the TBV will modulate open/closed.
• The plant has been tripped from 100% power due to a complete Loss of
Instrument Air.
• EOP 1.0 Immediate Actions have just been completed.
• Instrument Air pressure is zero psig (0 psig) and not rising.
What is the effect of this loss of Instrument Air on the Main Steam System’s ability to
remove PCS heat via the S/Gs?
A. Atmospheric Steam Dumps are still available to remove heat.
B. Atmospheric Steam Dumps and the Turbine Bypass Valve are still available to
remove PCS heat.
C. Only the S/G Code Safeties are able to remove PCS heat.
D. Only the Turbine Bypass Valve is able to remove PCS heat.
A. Atmospheric Steam Dumps are still available to remove heat.
From full power plant conditions, the following occurs:
• Main Turbine vibration rises rapidly due to several turbine blades puncturing the
turbine casing.
• A rapid complete loss of Main Condenser vacuum occurs.
• The Turbine NCO verifies the Main Turbine has tripped.
• The Reactor FAILS to trip automatically or manually.
• The crew takes appropriate actions for reactivity control, and reactor power is
lowering.
• The Atmospheric Dump Valves FAIL to actuate.
What is the effect of the above conditions on the plant secondary system?
A. Main Steam Safety Valves operate to maintain secondary system pressure at less
than 110% of design pressure.
B. Turbine Bypass Valve operates to maintain secondary system pressure at less than
design pressure.
C. Main Steam Isolation Valves close to prevent excessive depressurization of the
Steam Generators.
D. Steam Generator Hi-Level Override actuates to prevent water damage to Main
Steam lines.
A. Main Steam Safety Valves operate to maintain secondary system pressure at less
than 110% of design pressure.
The plant is in MODE 2 with TAVE at 533°F. During testing of the ADVs per SOP-7,
Attachment 4, it is found that CV-0781 CA’ S/G) is leaking slightly past the valve seat
following testing. The manual isolation valve for CV-0781 is closed to isolate this leak.
What Technical Specification Required Actions, if any, are applicable?
A. None are applicable with only one ADV inoperable.
B. Restore the ADV to Operable status within 7 days.
C. Restore the ADV to Operable status within 24 hours.
D. Be in Mode 3 within 6 hours.
A. None are applicable with only one ADV inoperable.
Plant is in MODE 3. It has been determined by I&C that S/G E-50A Low Pressure
Relay contact PICB/L contact is failed open and is considered inoperable. I&C reports
that this failure will defeat the Main Steam Isolation Valve closure on E-50A S/G low
pressure. The S/G E-50B Low Pressure Relay contact is not affected and is
considered operable. Which ONE of the following LCO Actions should be entered due
to this failure?
A. LCO 3.3.4.A.1
B. LCO 3.3.1.A.1
C. LCO 3.3.3.A.1
D. LCO 3.3.7.A.1
A. LCO 3.3.4.A.1
Provide a copy of E-211, Sh 1 and Sh 1A. Provide copy of Tech Specs.
Provide a copy of E-211, Sh 1 and Sh 1A. Provide copy of Tech Specs.
The plant is at 100% power steady state. ‘A’ MSIV CV-0510 instrument air supply line
develops an air leak that cannot be repaired at power. What Technical Specification
Required Actions would be applicable?
A. Restore the MSIV to Operable status within 24 hours.
8. Restore the MSIV to Operable status within 8 hours.
C. Restore the MSIV to Operable status within 7 days.
D. None. ‘A’ MSIV CV-0510 is operable.
D. None. ‘A’ MSIV CV-0510 is operable.
What is the basis for requiring the Steam Generator Low Pressure (SGLP) Actuation
signal to be operable in MODE 3?
A. Ensure the least affected Steam Generator is isolated to preclude the loss of a S/G
as a heat sink.
B. Ensure the MSIVs close to preclude the possibility of a positive reactivity addition
event.
C. Ensure the Steam Generators are isolated to protect the pressurizer from
pressurized thermal shock due to an overcooling event.
D. Ensure Tech Spec cooldown limits are not exceeded due to a Main Steam Line
Break event.
B. Ensure the MSIVs close to preclude the possibility of a positive reactivity addition
event.
The plant is in MODE 3 with TAVE at 5320F.
The Operating Crew is preparing to place the first Main Feedwater Pump in service.
Both CV-0701 and CV-0703, FW Regulating Valves are closed with power available.
It is determined that CV-0703, E-50B FW Regulating Valve, is inoperable and must be
closed and de-energized or isolated manually within 8 hours.
What is the basis for the above actions associated with CV-0703, E-50B FW
Regulating Valve?
A. Limit the amount of high energy fluid entering containment in the event of an Excess Steam Demand event inside containment.
B. Isolate containment in the event of an Excess Steam Demand event inside containment.
C. Prevent overfilling a faulted Steam Generator during a Steam Generator tube rupture.
D. Ensure feedwater is not supplied to a dry Steam Generator via a Condensate Pump as S/G pressure drops below 500 psia.
A. Limit the amount of high energy fluid entering containment in the event of an Excess Steam Demand event inside containment.
The plant is at 50% power. Atmospheric Steam Dump (ASDV) Controller, HIC-Ol80A,
is in MANUAL. A loss of Preferred AC Bus Y-20 then occurs.
Which ONE of the following describes operation of the Atmospheric Steam Dump
Valves (ASDVs) if an automatic reactor trip were to occur with the above conditions?
A. quick open and then modulate closed as designed
B. modulate open and then closed
C. remain closed
D. quick open and remain open
B. modulate open and then closed
ONP-24.1: HIC-Ol80A is powered from Y-10. Quick Open circuit does not go through HIC-Ol80A. Reactor trip from 50% power is not sufficient to cause a quick open signal.
A plant cooldown is in progress.
MSIV closure was blocked using both pushbuttons when the criterion for blocking was
met on both S/Gs.
EK-0970, “STEAM GEN VALVES ISOLATION LOCKOUT alarm has annunciated and
is still lighted.
Subsequent to establishing the block, adjustments were made to the Turbine Bypass
Valve position to lower the cooldown rate.
Steam Generator pressures rose to the following values and did not go higher:
AS/G
538 540 536 530
B S/G
540 554 546 552
Which of the following best describes the effect of continuing the plant cooldown
without any further Operator action?
A. ‘B’ S/G MSIV only will close if no further action to block is taken.
B. Both MSIVs will close if no further action to block is taken.
C. Neither MSIV will close as the block is “sealed in” once initiated.
D. ‘A’ S/G MSIV only will close if no further action to block is taken.
B. Both MSIVs will close if no further action to block is taken.
Correct. The block on ‘B’ S/G is removed if S/G 3 of 4 logic is lost by 2 S/G pressures> block setpoint.
The plant startup is in progress in accordance with GCL-2, Mode 5 To Mode 3 greater
than or equal to 525°F. Which of the following conditions MUST be met to prior to
commencing warm-up of the Main Steam lines using the MSIV Bypass Valves?
A. Reactor power = 2% power. TAVE approaching 520°F
B. Steam Generator pressure = 900 psia and TAVE = 525°F
C. Keff 538°F
C. Keff
Which one of the following statements describes the expected response of the
Atmospheric Steam Dump Valves (ADVs) and the Turbine Bypass Valve (TBV)
immediately following a reactor trip from 60% power?
A. ADVs Quick open and modulate closed and are full closed when TAVE is = 540°F;
TBV Quick opens and modulates closed as S/G pressure approaches 895 psia.
B. ADVs Quick open and modulate closed and are full closed when TAVE is = 535°F;
TBV Quick opens and modulates closed as S/G pressure approaches 895 psia.
C. ADVs modulate open and are full closed when TAVE is = 535°F;
TBV modulates open and modulates closed as S/G pressure approaches 895 psia.
D. ADVs modulate open and are full closed when TAVE is = 540°F;
TBV modulates open and modulates closed as S/G pressure approaches 895 psia.
C. ADVs modulate open and are full closed when TAVE is = 535°F;
TBV modulates open and modulates closed as S/G pressure approaches 895 psia.
Given the following:
• The plant is in a Chemistry Hold at 35% power during a startup.
• Turbine Bypass Valve CV-0511 fails open.
Assuming no operator action and no change in turbine load, what is the approximate
final steady state reactor power level?
A. 31%
B. 35%
C. 39%
D. 43%
C. 39%
Given the following conditions:
• The plant is at full power when BOTH Cooling Tower Pumps tripped.
• The plant was then manually tripped.
• Main Condenser Vacuum is O”hg.
• An undetermined malfunction has rendered all ADV’s inoperable.
Assuming NO operator action; what is the approximately PCS Cold Leg Temperature
approximately five minutes after the plant trip?
A. 552F
B. 545F
C. 535F
D. 532F
B. 545F
The Main Steam Isolation Valves automatically close when …
A. EITHER Steam Generator pressure lowers to 500 psia AND Containment pressure
rises to 4 psig.
B. BOTH Steam Generator pressures lower to 500 psia OR Containment pressure
rises to 4 psig.
C. BOTH Steam Generator pressures lower to 700 psia OR Containment pressure
rises to 4 psig.
D. EITHER Steam Generator pressure lowers to 500 psia OR Containment pressure
rises to 4 psig.
D. EITHER Steam Generator pressure lowers to 500 psia OR Containment pressure
rises to 4 psig.
Given the following:
• The plant is in a Chemistry Hold at 35% power during a startup.
• Turbine Bypass Valve CV-0511 fails open.
Assuming no operator action and no change in turbine load, what is the approximate
final steady state reactor power level?
A. 31%
B. 35%
C. 39%
D. 43%
C. 39%
Given the following plant conditions:
• Reactor trip has occurred from 100% power.
• Atmospheric Steam Dump Valve (AOV) controllers are in Auto.
• Turbine Bypass Valve (TBV) controller is in Auto.
• TBV is 100% open.
• AOVs are about 80% open and slowly modulating closed.
Which ONE of the following describes the effect of a loss of Instrument Air System
pressure on the operation of the TBV and AOVs?
A. TBV and AOVs will immediately close.
B. TBV will immediately close; AOVs will continue to respond to controller demand.
C. TBV and AOVs will continue to respond to controller demand.
D. TBV will continue to respond to controller demand; AOVs will immediately close.
B. TBV will immediately close; AOVs will continue to respond to controller demand.
Given the following conditions:
- The Plant is at 100% power.
- Alarm EK-0966, “MAIN STEAM ISOLATION VALVE UNDERVOLTAGE” has
annunciated in the Control Room.
Which one of the following may be used by the NCO to verify this alarm is valid?
A. Check Channel ‘A” Thermal Margin Monitor is de-energized.
B. Check MSIV position indication not available on C-01 panel.
C. Check Core Matrix light indications not lit on C-12 panel.
D. Check MCC-3 voltmeter reading zero volts on C-04 panel.
B. Check MSIV position indication not available on C-01 panel.
