RWM

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Author:
heidin
ID:
141731
Filename:
RWM
Updated:
2012-03-15 10:29:58
Tags:
Rod Worth Minimizer ILC
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  1. Following a Unit One reactor scram, 128 control rods have fully inserted. Nine control rods are at position 02. What will the RWM shutdown confirmation screen display for reactor Shutdown; and can it be determined the reactor will remain shutdown under all conditions without boron?


    A. Shutdown: No; it can be determined the reactor will remain shutdown under all conditions without boron.
    B. Shutdown: Yes; It can be determined the reactor will remain shutdown under all conditions without boron.
    C. Shutdown: No; it cannot be determined the reactor will remain shutdown under all conditions without boron.
    D. Shutdown: Yes; it cannot be determined the reactor will remain shutdown under all conditions without boron.
    A. Shutdown: No; it can be determined the reactor will remain shutdown under all conditions without boron.


    RWM shutdown confirmation screen has a programmed maximum subcritical bank withdraw position of 00 and this is the only method used by RWM to determine if the reactor will remain shutdown under all conditions. There are other methods of making this determination by procedure (all rods in except for one rod - shutdown margin; or all rods full in except for up to 10 at position 02; or as determined by reactor engineer)
  2. Following a Unit 1 Reactor scram, 134 control rods have fully inserted. One control rod is at position 04 and two control rods are at position 02.What will the RWM shutdown confirmation screen display?

    A. All RODS IN: NO
    SHUTDOWN: NO
    B. All RODS IN: NO
    SHUTDOWN: YES
    C. RODS IN: YES
    SHUTDOWN: NO
    D. RODS IN: YES
    SHUTDOWN: YES
    A. All RODS IN: NO SHUTDOWN: NO
  3. Which of the following could contribute to non-conservative enforcement of RWM rod insert and withdraw blocks (RWM may not enforce rod blocks when required)?
    A. APRM GAFs are adjusted to be >1.0.
    B. Steam flow transmitter A fails upscale.
    C. Partial opening of a turbine bypass valve.
    D. Feedwater flow transmitter B fails downscale.
    B. Steam flow transmitter A fails upscale.
  4. A turbine trip and reactor scram occurs on Unit One. The following indications are on the full core display:

    Green Lights Lit 136 rods
    Red lights Lit one rod

    Which one of the following choices completes the statements below?
    RWM Shutdown Confirmation Screen will display ____________.
    The reactor _________ remain shutdown under all conditions without boron.


    A. Shutdown: NO
    will

    B. Shutdown: NO
    will not

    C. Shutdown: YES
    will

    D. Shutdown: YES
    will not
    • A. Shutdown: NO
    • will

    With the green lights lit for 136 rods, this means that they are fully inserted. The last rod having a red light indicates that it is at position 48. The RWM will indicate All Rods In =NO, Shutdown =NO, and it can be determined that the reactor will remain shutdown under all conditions without boron.
  5. Rod Worth Minimizer uses for reactor power indication. When operating in the Transition Zone, Rod Motion Blocks will be:

    A. feed flow from the feedwater level control system; generated but not enforced.
    B. feed flow from the feedwater level control system; generated and enforced.
    C. steam flow from the feedwater level control system; generated but not enforced.
    D. steam flow from the feedwater level control system; generated and enforced.
    C. steam flow from the feedwater level control system; generated but not enforced.
  6. A reactor startup is in progress. During the startup, three rods had failed reed switches at their withdraw limits:
    26-31 position 3650-15 position 2418-15 position 12

    Rod position was verified per OP-7 and a substitute position was inserted. While continuing the startup with the three substituted rod positions, a reactor scram occurs. After the scram, the following information is indicated: Process computer indication All rods at position FF RWM SHUTDOWN SCREEN ALL RODS IN: YES SHUTDOWN: YES RODS NOT FULL IN: 000

    Determine if the response from the RWM indication of ALL RODS IN is accurate and why:

    A. Yes. The process computer printout showing FF's is given only when a rod is inserted past 00.
    B. No. The substituted rod positions caused the RWM to automatically bypass the affected rods in evaluating the shutdown confirmation.
    C. Yes. RWM automatically deleted the substituted positions when good reed switch data was detected when the scram occurred.
    D. No. Substitute rod positions remove the input from RPIS. ERFIS and the Process Computer positions can not be determined
    C. Yes. RWM automatically deleted the substituted positions when good reed switch data was detected when the scram occurred.

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