CRD

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Author:
heidin
ID:
140704
Filename:
CRD
Updated:
2012-03-15 10:45:47
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CRD ILC
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  1. During a low water level condition, the reactor operator is performing CRD system flow maximization per SEP-09. CRD parameters:

    Two pumps running
    FCV A in service and full open
    Pressure control valve full open
    Charging water header pressure 1150 psig

    The reactor operator should direct an AO to increase system flow by throttling the Charging Water Header Isolation Valve (F034) in the:

    A. open direction. Charging water header pressure indication will increase.
    B. open direction. Charging water header pressure indication will decrease.
    C. closed direction. Charging water header pressure indication will increase.
    D. closed direction. Charging water header pressure indication will decrease.
    B. open direction. Charging water header pressure indication will decrease.



    Throttling open F034 will provide additional flow to the RPV because the scram inlet valve will be open providing a path from the charging header through the open scram valve and up through the CRDM (same path as cooling water). Since charging header pressure is sensed upstream of F034 (basically pump discharge), the header indication basically follows the pump curve. A lower limit is placed on this pressure to prevent pump runout (Note SEP-09 simply directs the operator to throttle the valve and not to throttle open the valve since the valve would have to be throttled closed if charging header pressure is too low.)
  2. Unit One is at rated power. Control Rod individual scram time testing is being performed per 0PT-14.2.1. Control Rod 10·11 HCU charging header isolation valve (113) is closed in preparation of scram time testing. When Control Rod 10-11 is scrammed, the ball check internal to the mechanism insert port sticks closed. This failure will:

    A. prevent rod motion.
    B. not affect scram time.
    C. cause faster than normal scram time
    D. cause slower than normal scram time.
    D. cause slower than normal scram time.

    Rod scram is accomplished by a combination of accumulator and reactor pressure. When a scram is initiated, water from the accumulator is admitted to the under piston area when the scram valve opens. As accumulator pressure lowers below reactor pressure, the internal CRDM check valve lifts to allow reactor pressure to be admitted to the under piston area to complete the scram. Without the reactor pressure, the rod will still scram from partially depleted accumulator pressure, but at a slower rate.
  3. Unit Two is in Mode 2 at 850 psig and 3% power. The operating CRD Pump trips. Charging header pressure indicates 875 psig. Attempts to start the standby CRD Pump have been unsuccessful. Maintenance has been notified to investigate.

    A CRD Accum Lo Press/Hi Level alarm is received on P603. The operator observes that control rod 18-19 amber Accum light and red Full Out light are both lit on the full core display.

    What action is required?

    A. Immediately insert a manual reactor scram.
    B. Insert a manual reactor scram if the standby CRD pump cannot be started in 20 minutes.
    C. Dispatch an AO to determine the cause of the accumulator alarm, if the AO reports low pressure, insert a manual reactor scram.
    D. If the standby CRD pump cannot be started and a second accumulator alarm is received on the full core display, insert a manual reactor scram.
    A. Immediately insert a manual reactor scram.


    Immediate scram is required by Tech Spec 3.1.5, conditions C & D, and is also required by the supplementary actions of AOP-02.0.
  4. Unit Two is at 2% power and 250-psig reactor pressure during unit startup. The operator withdraws rod 22-19 to position 48. The following indications are noted:
    Rod Drift alarm seals in
    Rod Overtravel alarm seals in
    Rod 22·19 four rod display is blank
    Rod 22·19 full core display red light is out

    What operator action is required?

    A. Fully insert, and then disarm rod 22-19.
    B. Fully Insert rod 22-19, followed by a full withdrawal.
    C. Fully insert rod 22-19, followed by a single rod scram.
    D. Insert rod 22-19 one notch, followed by a full withdrawal.
    A. Fully insert, and then disarm rod 22-19.


    Indications are consistent with an uncoupled control rod. Re-coupling is allowed only if reactor power is above the RWM low power setpoint (8.75% TS allowable, 19.1% actual). Since power is below the LPSP, Tech Specs require the rod be inserted and disarmed.
  5. Unit One is at rated power. Control rod 10-11 HCU insert header isolation valve (101) is inadvertently closed.

    This mispositioned valve will:

    A. cause loss of cooling water to the drive mechanism and result in the inability of the rod to scram.
    B. cause loss of cooling water to the drive mechanism and result in a slower than normal rod scram time.
    C. not cause loss of cooling water to the drive mechanism but will result in the inability of the rod to scram.
    D. not cause loss of cooling water to the drive mechanism but will result in a slower than normal rod scram time.
    B. cause loss of cooling water to the drive mechanism and result in a slower than normal rod scram time.


    Reactor pressure still available to scram rod via ball check valve internal to CRDM, but accumulator is isolated from mechanism. Cooling water flow is through insert header. High mechanism temperature can also cause delay in scram time.
  6. The Unit Two CRD system is being restarted per 2OP-08, Control Rod Drive Hydraulic System Operating Procedure, following a trip of the running CRD pump. CRD system configuration:

    CRD Pump A Running
    CRD Flow Controller Auto
    CRD Drive Pressure Valve Full open
    CRD system flow 45 gpm

    The operator is directed by 2OP-08 to throttle the Drive PressureValve (C12-PCV-F003) to establish drive water differential pressure between 260 and 275 psid.

    Which one of the following describes how the CRD flow control valve (C12-F002A) and drive water differential pressure respond as the operator throttles this valve.

    The CRD flow control valve (C12-F002A) will throttle:
    open, and drive water differential pressure will go up
  7. Unit Two is operating at 90% to support performance of 0PT-14.1, Control Rod Operability Check. When control rod 18-19 is inserted from position 24 to position 22, the RO is not able to withdraw the rod back to position 24.

    Later, when control rod 42-07 is inserted from position 48 to position 46 the RO is not able to withdraw the rod back to position 48.

    What actions, if any, are required by TS 3.1.3?


    A. Declare control rod 18-19 only inoperable.

    B. Declare control rod 42-07 only inoperable.

    C. Declare control rods 18-19 and 42-07 inoperable.

    D. Neither control 18-19 or control rod 42-07 are required to be declared inoperable.
    D. Neither control 18-19 or control rod 42-07 are required to be declared inoperable.

    Per TS 3.1.3 bases, a control rod is considered stuck if it will not INSERT by either CRD drive water or scram pressure.
  8. Unit 1 is operating at rated reactor power. A control rod at position 21 develops a leaking scram outlet valve.

    Which of the following describes an expected response to this condition?

    The control rod may:


    A. Drift in and a North or South SDV NOT DRND alarm will occur.
    B. Drift out and a North or South SDV NOT DRND alarm will occur.
    C. Drift in and flow to the Reactor Vuilding Equipment Drain Tank will increase.
    D. Drift out and flow to the Reactor Vuilding Equipment Drain Tank will increase.
    C. Drift in and flow to the Reactor Vuilding Equipment Drain Tank will increase.


    The scram exhaust valve, C11/C12-CV-127, opens exhausting water from above the drive piston to the scram cischarge volume. This will allow P-over pressure to be vented and allow the control rod to drift in. During normal plant operation, the SDV is empty and the drain and two vent valves are open aligning water to the RBEDT.
  9. The Unit 2 CRD system is operating normally with the following conditions:

    CRD pump 2A in service
    CRD Flow Control Valve 2B in service
    CRD Flow Stabilizing Valves 2A in service

    During rounds the RB AO discovers an air leak on the instrument air line going to the CRD flow Control valve. How will the CRD flow control valve fail and what will be the impact to the CRD accumulators?


    A. closed due to the air leak, the CRD accumulators will not receive charging header flow if a scram were to occur.

    B. open due to the air leak, the CRD accumulators will not receive charging header flow if a scram were to occur.

    C. closed due to the air leak, the CRD accumulators will receive charging header flow if a scram were to occur.

    D. open due to the air leak, the CRD accumulators will receive charging header flow if a scram were to occur.
    C. closed due to the air leak, the CRD accumulators will receive charging header flow if a scram were to occur.


    The CRD flow control valve fails shut on a loss of air. The location of the flow control valve in the CRD system would allow the HCU accumulators to recharge following a scram and reset.
  10. The plant is currently at 100% power with the CRD system in normal operation. No control rod movement evolutions are in progress.

    Flow through the Control Rod Drive Hydraulic System stabilizing valves is approximately:


    A. 0 gpm for both the insert and withdraw stabilizing valves
    B. 4 gpm through the insert stabilizing valve and 2 gpm through the withdraw stabilizing valve.
    C. 2 gpm for the insert stabilizing valve and 2 gpm for the withdraw stabilizing valve.
    D. 2 gpm for the insert stabilizing valve and 4 gpm for the withdraw stabilizing valve.
    B. 4 gpm through the insert stabilizing valve and 2 gpm through the withdraw stabilizing valve.
  11. Unit 2 is conducting a startup; the reactor is critical at 635 psig. The operating CRD pump FAILS. A valve lineup change is made and the standby CRD pump is started, but ONLY develops a 475 psig discharge pressure. No HCU accumulator alarms have been received.

    What actions are required?


    A. Initiate repairs to the CRD System. Monitor CRD mechanism temperature. Shut down the reactor if the CRD temperatures reach 350°F.
    B. Commence a normal reactor shutdown. Monitor CRD mechanism temperatures. Scram the reactor if the CRD temperatures reach 350°F.
    C. Upon receipt of the first HCU low pressure alarm, immediately Scram the reactor and enter EOP-01.
    D. Immediately Scram the reactor and enter EOP-01.
    C. Upon receipt of the first HCU low pressure alarm, immediately Scram the reactor and enter EOP-01.
  12. If the operating pump …restart … pressure cannot be restored.

    Unit 2 is withdrawing control rods to achieve criticality, control rod 38-11 will not withdraw. The applicable procedure has been entered and is being performed.
    Present plant conditions are:

    RPV Pressure 0 psig
    Control rod 38-11 position 00
    CRD system flow 45 gpm
    CRD Drive pressure 265 psid
    CRD Cooling Water Pressure 9 psid
    CRD Cooling Water Flow 38 gpm
    CRD Charging Water Pressure 1500 psig

    What is the next drive dp to be established per the procedure prior to another withdraw attempt and what valve(s) will be throttled to achieve this setting?


    A. 300 psid by throttling closed the CRD FCV or throttling open the CRD drve water pressure control valve.
    B. 300 psid by throttling open the CRD FCV or throttling closed the CRD drve water pressure control valve.
    C. 350 psid by throttling closed the CRD FCV or throttling open the CRD drve water pressure control valve.
    D. 350 psid by throttling open the CRD FCV or throttling closed the CRD drve water pressure control valve.
    B. 300 psid by throttling open the CRD FCV or throttling closed the CRD drve water pressure control valve.
  13. Which one of the following identifies the component manipulations that will raise CRD drive water header differential pressure indication at Panel P603?

    A. throttle open Flow Control Valve C11-F002 or throttle open Drive Pressure Valve C11-PCV-F003

    B. B throttle open Flow Control Valve C11-F002 or throttle closed Drive Pressure Valve C11-PCV-F003

    C. throttle closed Flow Control Valve C11-F002 or throttle open Drive- Pressure Valve C11-PCV-F003

    D. throttle closed Flow Control Valve C11-F002 or throttle closed Drive Pressure Valve C11-PCV-F003
    B. B throttle open Flow Control Valve C11-F002 or throttle closed Drive Pressure Valve C11-PCV-F003


    To raise drive water pressure using a CRD system diagram, or system knowledge, the system configuration is such that closing the F003 or opening the F002 will raise CRD drive pressure differential.
  14. Unit One is at full power when all offsite power was lost. The following is the status of the Emergency Diesel Generators:

    DG1 Locked out on fault
    DG2 Running and loaded
    DG3 Running and loaded
    DG4 Running and loaded

    Which one of the following identifies the required action to re-establish the CRD system per 0AOP-36.1, Loss of Any 4160V Buses or 480V E-Buses, and also identifies the procedure that contains the step for placing the CRD Flow Control, C11-FC-R600, in manual with manual potentiometer at minimum setting?

    A. The 1A CRD Pump must be started;
    1OP-08, Control Rod Hydraulic System Operating Procedure.
    B. The 1A CRD Pump must be started;
    0AOP-02, Control Rod Malfunction/Misposition.
    C. The 1B CRD Pump must be started;
    1OP-08, Control Rod Hydraulic System Operating Procedure.
    D. The 1B CRD Pump must be started;
    0AOP-02, Control Rod Malfunction/Misposition.
    C. The 1B CRD Pump must be started; 1OP-08, Control Rod Hydraulic System Operating Procedure.


    With a loss of all offsite power, the E-Buses will strip the loads (CRD Pumps), there are no auto starts for these pumps, so both CRD pumps will be off. DG1 is lost which means E1 is lost and A CRD pump will not be able to be started. The guidance for restart is in the OP.
  15. During a normal control rod withdrawal sequence for control rod 26-11, the collet spring fails to return the collet poston to the retracted position. Which of the following describes the status of the addected contol rod?

    A. Slowly drift to the fully inserted position.
    B. Not move on a subsequent scram signal.
    C. Slowly drift to the fully withdrawn position.
    D. Not be able to be inserted or withdrawn via normal means.
    C. Slowly drift to the fully withdrawn position.
  16. A rupture of a Control Rod Drive Mechanism withdrawal line during power operation would result in:

    A. the control rod being fully inserted.
    B. the control rod being fully withdrawn.
    C. no control rod motion since the collet is latched.
    D. no control rod motion due to the shift of the ball check valve.
    A. the control rod being fully inserted.

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