Cond/FW

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heidin
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156342
Filename:
Cond/FW
Updated:
2012-05-29 17:11:48
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Condensate Feedwater ILC
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  1. Reactor Feed Pump (RFP) 2B is operating in DFCS auto mode of operation. The RFP
    B Control Trouble alarm is received. The operator notes the following indications on the RFP 2B speed display on P603:

    DFCS Setpoint is rising
    Speed Setpoint is rising
    Actual Speed is lowering

    Which of the following has occurred?

    A. RFP turbine trip.
    B. Loss of HPU oil pressure.
    C. Loss of all speed sensing.
    D. Governor emergency shutdown.
    B. Loss of HPU oil pressure.


    An emergency shutdown on the governor will set the signal from the speed reference block of the Woodward governor to 0, and will also trip the turbine hydraulically via an interposing relay. A turbine hydraulic trip will trip the emergency shutdown logic via an interposing relay. A turbine trip will also set the DFCS controller to manual and lower the demand to 0. Loss of speed sensing initiates the emergency shutdown logic. The TM·25 actuator will fail closed on loss of HPU oil pressure without initiating a turbine trip or emergency shutdown (RFP will coast down to 139 RPM, then trip on loss of speed sensing).
  2. During Unit Two startup, a second Condensate pump has been started in preparation for starting a Steam Packing Exhauster. Condensate pump discharge header pressure is indicating 235 psig. To return Condensate pump discharge header pressure to the desired band, the operator should adjust SJAE Condensate Recirculation Valve CO-FV-49 in the open direction by:


    A. increasing the output at CO-FIC-49, not to exceed a maximum flow limit of 17,000 gpm.
    B. increasing the output at CO-FIC-49, not to exceed a maximum flow limit of 21,000 gpm.
    C. decreasing the output at CO-FIC-49, not to exceed a maximum flow limit of 17,000 gpm.
    D. decreasing the output at CO-FIC-49, not to exceed a maximum flow limit of 21,000 gpm.
    C. decreasing the output at CO-FIC-49, not to exceed a maximum flow limit of 17,000 gpm.


    Controller output is 100% when the 49 valve is full closed; therefore, to throttle the valve open, the controller output must be decreased. A maximum flow limit of 17,000 gpm when using this valve has been established due to the April 05 Unit 2 scram on low level. During this event, the 49 valve was throttled too far and the condensate piping maximum flow limitation of approximately 21,000 was exceeded resulting in loss of feedwater (17,000 gpm is approximate condensate flow under full power conditions).
  3. Unit Two is at 250 psig during plant heatup and pressurization. Reactor Feed Pump (RFP) 2A is rotating at a 185 RPM due to wind milling with the following status:

    Suction valve is open
    Recirc Valve is open
    Discharge valve is closed
    RFP suction pressure is 390 psig
    RFPT A Turbine Tripped alarm (XU·2) is clear
    HPU oil pressure is 275 psig

    If the RFPT Start push button for RFP 2A on XU·1 is depressed, RFP 2A will:


    A. roll to 1000 RPM.
    B. roll to 2450 RPM.
    C. remain at 185 RPM.
    D. trip and coast to 0 RPM
    A. roll to 1000 RPM.


    Start permissives are suction and recirc valves open, normal suction pressure, HPU oil pressure at least 175 psig, and the trip reset. With all start permissives met, depressing the start push button will cause the turbine to roll to the low speed limit of the Woodward governor (1000 RPM). 2450 is the low speed limit of the DFCS speed controller.
  4. Unit Two is operating at rated power. The following indications are observed:

    HDD Lvl Cntrl Trouble alarm seals in (UA-04 1-6)
    Heater Drain Deaerator level is 42" and slowly lowering
    The Master light is lit below Level Controller LC-97

    If Deaerator level continues to lower, Heater Drain pumps will trip when Deaerator level reaches:


    A. 24", The operator should place LC-97 in Manual and use the keypad increase (up) key to stabilize Deaerator level.
    B. 36". The operator should place LC-97 in Manual and use the keypad increase (up) key to stabilize Deaerator level.
    C. 24", The operator should place LC-91 in Manual and use the keypad decrease (down) key to stabilize Deaerator level.
    D. 36", The operator should place LC-91 in Manual and use the keypad decrease (down) key to stabilize Deaerator level.
    A. 24", The operator should place LC-97 in Manual and use the keypad increase (up) key to stabilize Deaerator level.


    Tank low level alarm is 36", pump trip occur sat 24". Per OP-35,Section 8.2, ifmisoperation of the Heater Drain Level controller is observed, the operator should take manual control of the LC in control (master light lit, LC-97 is backup controller) and use the up/down keypads as necessary to return level in the normal range. For HD pump discharge valves, increasing the signal provides more air to the valve to allow the valve to throttle close (100%signal is full closed).
  5. During normal full power operation of Unit Two FW Heater 5A Level High-Low alarm
    (UA·046·B) is received. The operator notes that Drain Cooler Approach (DCA) for FW
    Heater 5A (process computer point C157) is 5°F lowering.

    Which of the following describes if the level in FW Heater 5A is high or low, and the potential impact on the Heater of the off normal level?

    FW Heater 5A level is:

    A. low. This can result in flashing at the subcooling zone inlet leading to erosion failure of the tubing.
    B. high. This can result in flashing at the subcooling zone inlet leading to erosion failure of the tubing.
    C. low. This can cause blockage of the internal vents, buildup of corrosive gases and internal corrosion.
    D. high. This can cause blockage of the internal vents, buildup of corrosive gases and internal corrosion.
    D. high. This can cause blockage of the internal vents, buildup of corrosive gases and internal corrosion.


    Normal DCA is 10°F. abnormally low DCA indicates heater level is high. High level can block the operating vents for the heater and result in build up of gases inside the heater that can lead to corrosion. Flashing in the subcooling zone is a problemassociated with low heater level.
  6. During a Unit Two Condensate system transient, Reactor Feed Pump (RFP) 2B has tripped on low suction pressure. The Condensate system has been restored to normal operation.

    What is the status of RFP 2B, and what action is required to reset the trip?

    A. The RFP trip only has actuated. This trip can be reset by depressing the RFPT Reset push button on XU-2.
    B. The RFP trip only has actuated. This trip can be reset by depressing the Control Reset push button on XU-1.
    C. The RFP trip and the Woodward emergency shutdown have both actuated. Both trips can be reset by depressing the RFPT Reset push button on XU-2.
    D. The RFP trip and the Woodward emergency shutdown have both actuated. Both trips can be reset by depressing the Control Reset push button on XU-1.
    C. The RFP trip and the Woodward emergency shutdown have both actuated. Both trips can be reset by depressing the RFPT Reset push button on XU-2.

    Low suction pressure hydraulically trips the RFPT by energizing trip solenoid SV-12. The hydraulic trip logic also trips the emergency shutdown logic via an interposing relay. The Control reset push button on XU-1 will reset the emergency shutdown logic but will not reset the hydraulic trip (energizing SV-S). Depressing the RFPT trip reset on XU-2 energizes SV-VA and resets the control logic via an interposing relay.
  7. Unit Two is operating at 65% power with RFP A running and RFP B unavailable. The
    following alarm and indications occur:

    RFP A Control Trouble alarm sealed in
    DFCS Control light for RFPT A on XU·1 is out

    Recirculation Pump 2B trips. How will Reactor water level respond without operator action, and what operator action will restore Reactor water level to the normal band? Without operator action, Reactor water level will:

    A. lower to the LL1 scram setpoint. The operator can stabilize level by operating the RFPT Raise/Lower control switch in the Lower direction.
    B. lower to the LL1 scram setpoint. The operator can stabilize level by placing the RFPT A Speed Controller in Manual and lowering the output demand.
    C. rise to the high level turbine trip setpoint. The operator can stabilize level by operating the RFPT Raise/Lower control switch in the Lower direction.
    D. rise to the high level turbine trip setpoint. The operator can stabilize level by placing the RFPT A Speed Controller in Manual and lowering the output demand.
    C. rise to the high level turbine trip setpoint. The operator can stabilize level by operating the RFPT Raise/Lower control switch in the Lower direction.


    With the RFP Control Trouble in alarm and the DFCS light out, this indicates a loss of input signal to the RFP governor cabinet from the DFCS system. The governor cabinet will maintain the last known signal and place control of the RFP on the Raise/Lower manual switch. A Recirc pump trip will cause level to rise due to void formation and drawing less water from the downcomer. Power will lower and with the RFP in Manual control, level would continue to rise to the high level trip setpoint. The Speed Control Station will not work because the DFCS signal has failed.
  8. Unit Two is performing plant heat up and pressurization per GP-02. Reactor Feed
    Pump (RFP) 2A is in service with the following configuration:

    Turbine speed is 2200 RPM
    Pump discharge pressure is 500 psig
    Reactor pressure is 400 psig
    Man/DFCS control switch in Man
    RFP Speed Control is in Manual with a pump demand of 0
    Master RFP Speed/Reactor Level Control is in Manual with a master demand of 0

    What action is required for the operator to raise RFP 2A discharge pressure to maintain RFP discharge pressure at least 100 psig above reactor pressure as heat up and pressurization continue?

    A. Place RFP A Lower/Raise speed control switch to Raise.
    B. Depress the Raise push button on the RFP A Speed Control Station.
    C. Depress the Raise push button on the Master RFP Speed/Reactor Level Control Station.
    D. Place the Man/DFCS control switch to DFCS, then depress the Raise push button on the RFP A Speed Control Station.
    • A. Place RFP A Lower/Raise speed control switch to Raise.

    Per OP-32, Section 5.5. RFP A Lower/Raise speed control switch is used to control RFP speed until speed is within the range of the DFCS system. RPM must be at least 2450 for DFCS control, and procedurally, transfer to DFCS control occurs at 2550 RPM.
  9. With Unit Two operated at rated power, the 2A Feedwater Heater level reaches the Hi Hi Level setpoint due to a failed Feedwater Heater level control valve.

    Which one of the following choices completes the statement below?

    The Moisture Removal Valves will open to drain the extraction steam lines to the ______ and final feedwater temperature to the reactor will __________.

    A. Condenser;
    Increase
    B. Condenser;
    Decrease
    C. Heater Drain Deaerator;
    Increase
    D. Heater Drain Deaerator;
    Decrease
    • B. Condenser;
    • Decrease


    A high-high level condition in the 2A FW Heater will cause the associated MRVs to open, directing 11th stage extraction steam to the condenser, and allowing the extraction line check valves to close. Feedwater heating is lost for this heater causing overall feedwater temperature to decrease.
  10. Reactor pressurization is in progress per 0GP-02, Approach to Criticality and Pressurization of the Reactor.

    The feedwater system is aligned as follows:

    RFP A is in Service
    RFP A Recirc Valve (FW-FV-V46) is open
    Reactor Pressure is 400 psig
    SULCV (FW-LV-3269) in Auto
    Feedwater Heater 4A and 48 inlet isolation valves are closed
    FW-FV-177, Feedwater Recirc Valve, throttled open with 0.5 Mlbm/hr.

    Which one of the following choices predicts the automatic response of the SULCV and also completes the caution statement in accordance with GP-02?

    If the operator throttles FW-FV-177 in the open direction, the SULCV will automatically throttle in the _________ direction. Opening the FW-FV-177 more than the _______ may cause feedwater line depressurization and loss of flow to the reactor vessel.

    A. open;
    RFP A Recirc Valve
    B. closed;
    RFP A Recirc Valve
    C. open;
    SULCV
    D. closed;
    SULCV
    • C. open;
    • SULCV


    Throttling open the FW-V177 will divert flow from the reactor back to the condenser. This will require the SULCV to open further to provide the needed flow to maintain set reactor water level. A Caution in GP-02 warns against opening FW-V117 more than the SULCV. This may cause depressurization of the feedwater line and loss of flow to the reactor vessel.
  11. Unit Two is operating at 30% reactor power when a complete loss of the Vital UPS
    System occurs.

    Which one of the following describes how this loss will affect RFPT operation?

    A. RTGB trip pushbutton function is lost.
    B. overspeed trip circuit will lose power causing RFPT Trip.
    C. vibration instrumentation will lose power causing RFPT Trip.
    D. RFPT woodward control trip circuits will be powered from their redundant power supplies.
    D. RFPT woodward control trip circuits will be powered from their redundant power supplies.
  12. Which one of the following choices completes the statements below regarding how a total loss of UPS will affect the Digital Feedwater Level Control System Controllers.

    Level Setpoint adjustment is __________

    Level Setdown ________ occur following a reactor scram.


    A. available;
    will

    B. available;
    will not

    C. not available;
    will

    D. not available;
    will not
    • D. not available;
    • will not


    A Loss of UPS will cause the RFPT controller screens to go blank. The backup OC power supplies will allow continued operation; however, the operator will be unable to adjust level setpoint. Reactor Water level setdown will not occur in the event of a reactor scram.
  13. Unit Two (2) is performing heatup and pressurization of the Reactor. The feedwater system is aligned as follows:

    Startup Level Control Valve Controller is in AUTO
    Master Feedwater Controller is in MANUAL
    RFP A is operating with its controller in MANUAL

    The CO wants to change the position of the Startup Level Control Valve. Which one of the following controls must be adjusted?


    A. Level error on the Startup Level controller
    B. Valve demand on the Startup Level controller
    C. Level setpoint on the Master Feedwater controller
    D. Master demand on the Master Feedwater controller
    C. Level setpoint on the Master Feedwater controller
  14. Unit Two (2) is at 100% power when the following conditions are observed:

    N004 A/B/C indicate +183 inches and lowering
    RFP A CONTROL TROUBLE (UA-13, 6-5) alarming
    RFPT 2A DFCS CTRL light is illuminated
    RFPT 2B DFCS CTRL light is illuminated
    RFPT 2A speed indication is lowering: RFPT 2A Speed Demand is increasing
    RFPT 2B speed indication is increasing: RFPT 2B Speed Demand is increasing

    What caused this condition and what operator action(s) are required?


    A. Loss of RFPT 2A speed signal. Place the RFPT 2A MANUAL/DFCS switch in MANUAL and raise speed
    B. Loss of RFPT 2B speed signal. Place the RFPT 2B M/A Controller in MANUAL and increase speed demand
    C. Loss of hydraulic oil pressure to RFPT-2A TM-25 actuator. TRIP RFPT 2A.
    D. Loss of hydraulic oil pressure to RFPT-2B TM-25 actuator. TRIP RFPT 2B.
    C. Loss of hydraulic oil pressure to RFPT-2A TM-25 actuator. TRIP RFPT 2A.
  15. The 2A RFPT is being started per 2OP-32, Section 5.12, “Reactor Feed Pump Startup from Zero Speed to Idle Speed.” The Reactor Operator reports that, after reset of the feed pump on XU-2 following the RFP manual trip test, that the RFPT Start light is not illuminated.

    Which of the following is a possible reason that the light is not illuminated?


    A. The operator did not depress CTRL RESET at panel XU-1.
    B. RFP lube temperature is less that 85 degrees.
    C. RFP A Recirc Valve is closed.
    D. RFP A Discharge valve is closed.
    C. RFP A Recirc Valve is closed.
  16. Unit Two (2) is at 52% RTP during power ascension following a refuel outage. The condensate system parameters are as indicated below.

    CO-FV-49 flow at: 14000 GPM
    Cond pump disch pressure ~175#
    Cond bstr pump suction pressure ~125#
    Cond bstr pump disch pressure ~350#
    RFP suction press ~ 340#

    The crew is preparing to start the second heater drain pump in accordance with 0GP-04. Based on current plant conditons, what system adjustment is needed to ensure compliance with plant operating procedures?


    A. SJAE CONDENSATE RECIRCULATION VALVE, CO-FV-49, should be fully closed.

    B. SJAE CONDENSATE RECIRCULATION VALVE, CO-FV-49, should be fully opened.

    C. AIR EJECTOR COND FLOW RECIRC CTL, CO-FIC-49, output needs to be adjusted towards 100% to raise system flow.

    D. AIR EJECTOR COND FLOW RECIRC CTL, CO-FIC-49, output needs to be adjusted towards 0% to raise system pressure.
    A. SJAE CONDENSATE RECIRCULATION VALVE, CO-FV-49, should be fully closed.

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