HPCI

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Author:
heidin
ID:
141754
Filename:
HPCI
Updated:
2012-03-15 12:19:10
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HPCI ILC
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  1. HPCI is operating in pressure control mode. HPCI status is as follows:

    HPCI flow controller Auto
    HPCI flow 3000 gpm
    HPCI turbine speed 3500 RPM
    HPCI controller output 80%
    RPV pressure 990 psig, rising

    The operator can attempt to stabilize RPV pressure by throttling the HPCI Test Return
    Valve (E41-F008) in the:

    A. open direction, or by raising the flow controller setpoint.
    B. closed direction, or by raising the flow controller setpoint.
    C. open direction. or by lowering the flow controller setpoint.
    D. closed direction, or by lowering the flow controller setpoint.
    B. closed direction, or by raising the flow controller setpoint.



    • Throttling closed F008 will reduce HPCI flow causing controller output to rise to return
    • flow to 3000 gpm and cause turbine to use more steam to maintain flow. Raising
    • controller auto setpoint will require more steam to pump at the higher flowrate and alsoraise controller output.*
  2. Unit Two HPCI has received an automatic initiation signal on high drywell pressure. The operator observes the following indications:

    Steam Isolation Valves (F002/F003) Open
    Steam Supply Valve (F001) Open
    Turbine Stop Valve (V8) Closed
    HPCI Turbine Speed 0 RPM
    HPCI Turb Tripped Alarm sealed in
    HPCI Turb Trip Sol Ener Alarm sealed in

    Which of the following would explain the above indications?


    A. Loss of oil pressure.
    B. High steam line flow.
    C. Low steam line pressure.
    D. High Reactor water level.
    D. High Reactor water level.


    Loss of oil pressure could result in closure of the stop valve and 0 RPM but would not energize the trip solenoid. High steam line flow would energize the trip solenoid but would also close the isolation valves. Low steam line pressure is a direct input to turbine trip solenoid, but also closes the steam isolation valves. High reactor water level also energizes the trip solenoid but would not close the steam isolation valves.
  3. During a loss of feedwater, HPCI has automatically initiated on low Reactor water level and is injecting to the reactor vessel. Current plant conditions are as follows:

    Reactor level +150 inches
    Reactor pressure 920 psig
    Drywell pressure 0.5 psig
    HPCI flow 4300 gpm
    HPCI Initiation Signal/Reset white light LIT

    If the HPCI Manual Isolation System A pushbutton is depressed:


    A. the inboard steam isolation valve, E41-F002, will close and HPCI turbine will trip
    B. the outboard steam isolation valve, E41-F003, will close and HPCI turbine will trip.
    C. HPCI will continue to inject to the reactor.
    D. the steam supply valve, E41-F001, will close.
    C. HPCI will continue to inject to the reactor.
  4. Following a loss of feedwater, HPCI auto initiated to restore reactor level. Current plant conditions are:

    Reactor level +210 inchesReactor pressure 920 psigHPCI TURB TRIP in alarmHPCI TURB TRIP SOL ENER in alarm

    If reactor water level begins to drop, HPCI will:
    A. initiate if level drops below the hi level trip setpoint of 206".
    B. AUTO initiate if level drops to <105".
    C. not initiate at any level until the turbine trip is reset by the operator.
    D. not initiate at any level until the high level trip logic is reset by the operator.
    B. AUTO initiate if level drops to <105".
  5. Following a loss of off-site power, HPCI initiated on low reactor level then tripped on high reactor level. Current plant conditions are:
    Reactor water level is 180 inches, steadyHPCI Initiation Signal/Reset white light is LITHPCI High Water Level Signal Reset white light is LITHPCI TURB TRIP alarm is sealed inHPCI TURB TRIP SOL ENER alarm is sealed in
    If drywell pressure rises to above 2 psig, the HPCI turbine trip will:

    A. reset. HPCI will initiate and inject to the reactor with no operator action.
    B. reset. HPCI will initiate but NOT inject to the reactor until the injection valve is opened by operator action.
    C. NOT reset. The operator may reset the high water level trip and HPCI will inject with no other operator actions.
    D. Not reset. The operator may reset the high water level trip, but must
    C. NOT reset. The operator may reset the high water level trip and HPCI will inject with no other operator actions.
  6. Unit Two (2) is operating at rated power when a loss of feedwater causes reactor level to decrease to the HPCI initiation setpoint. The HPCI injection valve, E41-F006, will begin to open:

    A. immediately upon receipt of an initiation signal.
    B. when governor valve, E41-V9, begins to throttle open.
    C. when steam supply valve, E41-F001 and stop valve, E41-V8, are not full closed.
    D. when pump discharge pressure exceeds 120 psig.
    C. when steam supply valve, E41-F001 and stop valve, E41-V8, are not full closed.
  7. A small break LOCA has occurred on UNIT 1. HPCI and RCIC are being used for level control.
    HPCI flow 2000 gpm in AUTORCIC flow 450 gpm in AUTO
    The leak size increases causing level to lower. In response, the Control Operator depresses the PF pushbutton on the HPCI flow controller.

    What is the demanded HPCI flowrate now?


    A. 2000 gpm
    B. 3000 gpm
    C. 4000 gpm
    D. 4300 gpm
    A. 2000 gpm
  8. HPCI is running in pressure control following an automatic initiation on LL2. The white light is still illuminated and signal has not been reset.

    Plant conditions are:
    Level 175” DW pressure .8 psig

    A steam leak develops on the HPCI steam line in the mini steam tunnel. The operator depresses the isolation button. Determine the effect on system operation.

    A. System continues to operate
    B. E41-F041/F0003 close
    C. E41-F042/F002 close
    D. E41-F002/F003/F041 & F042 close
    A. System continues to operate
  9. HPCI is in a standby alignment with the exception of the pump discharge motor operated valve (E41·F007) being closed, as well as the injection valve (E41-F006). HPCI receives an initiation on low level causing the Steam Supply Valve (E41·F001) to open, and the Aux Oil Pump to auto start.

    Before the Turbine Stop Valve (E41·V8) begins to open, level rises above the initiation setpoint. How will E41·F006 and E41·F007 respond?

    A. E41·F006 and E41·F007 both open.
    B. E41·F006 and E41·F007 both remain closed.
    C. E41·F006 opens, and E41·F007 remains closed.
    D. E41-F007 opens, and E41·F006 remains closed.
    D. E41-F007 opens, and E41·F006 remains closed.


    F007 (which is normally closed) will receive an immediate open signal when the initiation signal is received. F006 will not receive an initiation until both the steam supply and turbine stop valves are not full closed (takes 10-15 seconds after the AOP starts for V8 to begin to open). The F006 also has to have the low level initiation relays still energized to open. Since these relays do not seal in, they are de-energized when V8 starts to open; therefore, the F006 valve will not open.
  10. Unit 2 is operating at rated power. A HPCI PT is in progress with the following abnormal suction valve alignment:

    CST suction valve (E41-F004) CLOSED
    Supression Pool suction valve (E41-F041) OPEN
    Supression Pool suction valve (E41-F042) CLOSED

    If a loss of feedwater results in an automatic HPCI system initiation signal, how will HPCI suction valve respond?


    A. E41-F004 auto opens, E41-F041 auto closes
    B. E41-F004 auto opens, E41-F041 remains open
    C. E41-F004 remains closed, E41-F042 auto opens
    D. E41-F004 remains closed, E41-F042 remains closed
    B. E41-F004 auto opens, E41-F041 remains open
  11. A loss of Feedwater resulted in a HPCI and RCIC auto initiation. HPCI and RCIC functioned as expected and raised RPV level to 210”. RPV level is now 150”.

    What operator action is required to start HPCI to restore RPV level?


    A. OPEN the HPCI Steam Supply Valve, F001, and OPEN the HPCI Injection Valve, F006.
    B. OPEN the HPCI Steam Supply Valve, F001, and the HPCI Injection Valve, F006, will automatically OPEN.
    C. Reset the HPCI High Water Level trip pushbutton and HPCI will automatically start with no further operator action.
    D. Reset the HPCI High Water Level trip pushbutton, and OPEN the HPCI Injection Valve, F006, when the Turbine Stop Valve, V8, is OPEN.
    D. Reset the HPCI High Water Level trip pushbutton, and OPEN the HPCI Injection Valve, F006, when the Turbine Stop Valve, V8, is OPEN.
  12. Unit Two (2) is operating at rated power when a loss of feedwater causes reactor level to decrease to the HPCI initiation setpoint. The HPCI injection valve, E41-F006, will begin to open:

    A. immediately upon receipt of an initiation signal.
    B. when governor valve, E41-V9, begins to throttle open.
    C. when steam supply valve, E41-F001 and stop valve, E41-V8, are not full closed.
    D. when pump discharge pressure exceeds 120 psig.
    C. when steam supply valve, E41-F001 and stop valve, E41-V8, are not full closed.
  13. Unit One was operating at full power when a scram ocurred due to a loss of drywell
    cooling with the following plant conditions.

    Reactor water level 155 inches (slowly lowering)
    Drywell pressure 2.1 psig (slowly rising)
    High Level Trip A Amber light extinguished
    High Level Trip B Amber light illuminated
    High Level Trip C Amber light illuminated

    Which one of the following is the status of the reactor feed pumps and HPCI system?

    The Reactor feed pump turbines:


    A. are running and HPCI is injecting to the vessel.
    B. are tripped, but HPCI is still injecting to the vessel.
    C. are running, but HPCI is tripped.
    D. and HPCI are both tripped.
    D. and HPCI are both tripped.


    • The reactor feed pumps and HPCI will trip on a two out of three logic. The high water trip amber lights
    • feed into the RFP trip logic and provide indication that a high level condition exists. With drywell pressure
    • greater than 2 psig, HPCI should have auto started, but it had tripped on high level and will not restart
    • automatically until LL2, with level lowering is also an indication that it is tripped. These must be manuallyreset to restart the pumps with the exception of HPCI which will auto restart if level is below LL2.
  14. Unit Two is operating under accident conditions with the following plant conditions due to a steam leak on HPCI:

    Reactor Water Level -20 inches
    Reactor Pressure 900 psig
    Injection sources available HPCl only
    Offsite Release Alert declared
    HPCI Room Temperatures 140°F
    Suppression Pool Temperature 130° F

    Which one of the following identifies the required HPCI operation action in accordance with RRCP and also identifies the reason for taking the action?


    A. HPCI should be left running
    It is required to be operated by the EOP's

    B. HPCI should be isolated
    It should have isolated on room high temperature

    C. HPCI should be left running
    Steam leak detection was overridden per RVCP

    D. HPCI should be isolated
    To prevent damage to the HPCI pump due to high suppression pool temperatures
    A. HPCI should be left running It is required to be operated by the EOP's


    • RRCP normally has the operators isolate a primary system discharging except if it is needed to maintain
    • adequate core cooling. With level below top of active fuel and required for EOP's this is the case. If there
    • was a valid PCIS signal then this should not prevent the operator from making sure that the isolation occurs.
  15. Following a loss of feedwater on Unit Two, HPCI has automatically initiated on low reactor water level and is injecting to the reactor vessel. Current plant conditions are:

    Reactor level +90 inches
    Reactor pressure 920 psig
    Drywell pressure 0.5 psig
    HPCI flow 4300 gpm

    If the HPCI Manual Isolation System A pushbutton is depressed:
    The Outboard Steam Isolation Valve (E41-F003) will close and the HPCI Turbine Stop Valve (E41-V8) will trip.

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