RHR

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Author:
heidin
ID:
141760
Filename:
RHR
Updated:
2012-03-15 12:42:09
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RHR ILC
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  1. A line break has occurred in the Unit Two drywell with the following sequence of events:

    1200 Drywell pressure rises above the scram setpoint
    1202 RPV level drops below the LPCI initiation setpoint
    1204 RPV pressure drops to the LPCI initiation setpoint
    1205 RPV level rises above the LPCI initiation setpoint

    When does the operator have throttle capability for the Outboard LPCI Injection Valves (E11·F017) and the RHR Heat Exchanger Bypass Valves (E11-F048)?

    The operator can throttle E11·F017 at:

    A. 1207 and can throttle F048 at 1205.
    B. 1207 and can throttle F048 at 1207.
    C. 1209 and can throttle F048 at 1205.
    D. 1209 and can throttle F048 at 1207.
    C. 1209 and can throttle F048 at 1205.


    • The F017 is interlocked open for 5 minutes from the receipt of a LPCI initiation signal in
    • conjunction with RPV pressure dropping below 410 psig. This 5 minute timer starts at1204 (F017 can be throttled at 1209). The F048 is interlocked open for 3 minutes from the receipt of a LPCI initiation signal irrespective of RPV pressure. This 3 minute timer starts at 1202 (F048 can be throttled at 1205).
  2. Following a Recirculation line breakoccurs on Unit One (1).
    Plant conditions are:

    RPV water level +160 inches
    RPV pressure 80 psig
    Drywell pressure 20 psig

    All RHR pumps except 1C have been overridden off to control level. Subsequently a loss of DC Switchboard 1A occurs. No DC manual transfers have been performed. RHR loop 1A status now will have:

    A. RHR Pump 1A only running with no flow.
    B. RHR Pumps 1A and 1C running with no flow.
    C. RHR Pump 1A only injecting to the reactor vessel.
    D. RHR Pumps 1A and 1C injecting to the reactor vessel.
    D. RHR Pumps 1A and 1C injecting to the reactor vessel.
  3. Following a line break on Unit One, the reactor has been emergency depressurized. RHR loop A is placed in drywell and suppression chamber spray with the following conditions:

    RPV water level 180 inches
    RPV pressure 50 psig
    Drywell pressure 14 psig
    Suppr chamber press 13 psig

    Spray operation has caused drywell pressure to lower to 2.6 psig, and suppression chamber pressure to lower to 3.1 psig. What is the current status of the drywell and suppression chamber spray valves?

    Drywell spray valves:

    A. and suppression chamber spray valves both automatically closed when drywell pressure dropped below2.7 psig.
    B. and suppression chamber spray valves are still open. Drywell and suppression Chamber spray valves must be manually closed when drywell pressure drops below 2.5 psig.
    C. automatically closed when drywell pressure dropped below 2.7 psig, suppression chamber spray valves will automatically close when suppression chamber pressure drops below2.7 psig.
    D. and suppression chamber spray valves are still open. Drywell spray valves must be manually closed when drywell pressure drops below2.5 psig, suppression chamber spray valves must be manually closed when suppression chamber pressure drops below2.5 psig.
    A. and suppression chamber spray valves both automatically closed when drywell pressure dropped below2.7 psig.


    Spray logic requires drywell pressure to be at or above2.7 psig to be energized and allow spray operation for both drywell and torus (torus pressure does not input to the logic). When drywell pressure dropsbelow2.7 psig the spray logic de-energizes. The spray valves auto close when the spray logic drops out only if a LPCI signal is present (it is due to APV and drywell pressure at a minimum). If a LPCI signal is not present, PGGP directs securing spray when the respective pressure drops below 2.5 psig.
  4. Unit Two was operating at power in a Tech Spec action for DG 2 being under clearance. A LOOP/LOCA occurs. Plant conditions:

    RPV level Below TAF
    RPV pressure 25 psig
    Drywell pressure 22 psig
    Available DGs Started and loaded

    What is the status of RHR Loop 2B?


    A. RHR Pump 2B only running on minimum flow.
    B. RHR Pump 2D only running on minimum flow.
    C. RHR Pump 2B only injecting to the reactor vessel.
    D. RHR Pump 2D only injecting to the reactor vessel.
    A. RHR Pump 2B only running on minimum flow.
  5. Unit 2 is in MODE 5 with RHR 2B in SDC. RPV level needs to be lowered below 200” for maintenance with the steam separator installed.

    The 4 fuel assemblies surrounding several in-core instrument tubes have been removed and NOT replaced by a blade guides.

    Minimum RPV Water level to maintain forced circulation is:

    A. 195”.
    B. 190”.
    C. 185”.
    D. 180”.
    B. 190”.
  6. During a large break LOCA on Unit Two, plant conditions are:

    RPV level -42 inches
    RPV pressure 20 psig
    Drywell pressure 18 psig

    Placing the RHR system in drywell spray requires the operator to place:

    A. The “Think” switch to MANUAL only.
    B. The 2/3 Core Height LPCI Override keylock to OVRD only.
    C. The “Think” switch to MANUAL, then the 2/3 Core height LPCI Override keylock to OVRD.
    D. The 2/3 Core Height LPCI Override keylock to OVRD, then the “Think” switch to MANUAL.
    A. The “Think” switch to MANUAL only.
  7. During a line break in the drywell, RHR has been placed into torus spray with the following plant conditions:

    RPV level +40 inches
    PRV pressure 500 psig
    Drywell pressure 22 psig

    Assuming only one of the above parameters change, when will the torus slpray valves close?

    A. Operator action only.
    B. RPV pressure drops below 400 psig.
    C. Torus pressure drops below 2.7 psig.
    D. RPV level drops below 2/3 core height.
    D. RPV level drops below 2/3 core height.
  8. Following a loss of DC Panel 3A, a Recirculation line break occurs on Unit One (1). Plant conditions are:

    RPV level +60 inches
    RPV pressure 380 psig
    Drywell pressure 20 psig

    Assuming RHR Loop 1A was in a standby alignment prior to the line break, the expected response of RHR loop 1A is that RHR Pump 1A and 1C are:


    A. not running.
    B. running with no flow.
    C. running on minimum flow.
    D. injecting to the reactor vessel.
    B. running with no flow.


    The min flow valve, F007A, logic is powered by DC Panel 3A. (SD-17)
  9. During a line break in the drywell, RHR has been placed into drywell spray with the following plant conditions:

    RPV level +60 inches
    RPV pressure 500 psig
    Drywell pressure 22 psig

    Assuming only one of the above parameters change, when will the drywell spray valves close?


    A. Operator action only.
    B. RPV pressure drops below 400 psig.
    C. RPV level drops below 2/3 core height.
    D. Drywell pressure drops below 2.7 psig.
    A. Operator action only.
  10. Following a loss of DC Switchboard 1A, a Recirculation line break occurs on Unit One (1). No DC manual transfers have been performed. Plant conditions are:

    RPV level +60 inches
    RPV pressure 250 psig
    Drywell pressure 20 psig

    Assuming RHR Loop 1A was in a standby alignment prior to the line break, what is the expected response of RHR loop 1A?


    A. RHR Pump 1A only running with no flow.
    B. RHR Pump 1A only injecting to the reactor vessel.
    C. RHR Pumps 1A and 1C running with no flow.
    D. RHR Pumps 1A and 1C injecting to the reactor vessel.
    A. RHR Pump 1A only running with no flow.


    Look at the breaker control power in SD-17. DC 1A (lost) powers 1C pump. 1A pump is powered by DC 2A, so it’s running. However, RPV pressure is too high for injection.


    This question can be asked with a lower RPV pressure. It all depends on pump discharge pressure in relation to RPV pressure!
  11. Following a loss of DC Switchboard 1A, a Recirculation line break occurs on Unit One (1). No DC manual transfers have been performed. Plant conditions are:

    RPV level +60 inches
    RPV pressure 180 psig
    Drywell pressure 20 psig

    Assuming RHR Loop 1A was in a standby alignment prior to the line break, what is the expected response of RHR loop 1A?

    A. RHR Pump 1A only running with no flow.
    B. RHR Pumps 1A and 1C running with no flow.
    C. RHR Pump 1A only injecting to the reactor vessel.
    D. RHR Pumps 1A and 1C injecting to the reactor vessel.
    C. RHR Pump 1A only injecting to the reactor vessel.
  12. During a line break in the drywell, RHR has been placed into torus cooling with the following plant conditions:

    RPV level +60 inches
    RPV pressure 400 psig
    Drywell pressure 22 psig

    Assuming only one of the above parameters change, when will the torus cooling valves close?


    A. Operator action only.
    B. RPV level drops below LL3.
    C. RPV level drops below 2/3 core height.
    D. Drywell pressure drops below 2.7 psig.
    C. RPV level drops below 2/3 core height.
  13. Unit One was operating at 100% power with DG2 under clearance. A Reactor Recirculation line break in the drywell results in the following plant conditions:

    RPV level +60 inches
    RPV Pressure 150 psig
    Drywell Pressure 20 psig

    What is the expected response of RHR Loop 1B?
    RHR pumps 1B and 1D running and injecting.
  14. Unit Two is in Shutdown Cooling using RHR Pump 2B. An inadvertant heatup results in the following plant conditions:

    RPV level 200 inches
    RPV pressure 140 psig
    Drywell pressure 0.2 psig

    How will RHR Loop 2B respond?


    A. Shutdown cooling isolates with all valves (F008/F009/F015B) and RHR pump 2B trips.

    B. Shutdown cooling suction valves isolate (F008/F009) only and RHR pump 2B trips.

    C. Shutdown cooling isolates with all valves (F008/F009/F015B) and RHR pump 2B continues to run.

    D. Shutdown cooling suction valves isolate (F008/F009) only and RHR pump 2B continues to run.
    B. Shutdown cooling suction valves isolate (F008/F009) only and RHR pump 2B trips.
  15. Unit Two is in Shutdown Cooling using RHR Pump 2B. A small steam leak results in the following plant conditions:

    RPV level 200 inches
    RPV pressure 90 psig
    Drywell pressure 1.9 psig

    How will RHR Loop 2B respond?


    A. Shutdown cooling isolates and RHR pump 2B trips.
    B. RHR pump 2D auto starts and decay heat removal increases.
    C. RHR pump 2D auto starts but decay heat removal decreases.
    D. RHR Pump 2B remains running and RHR pump 2D remains off.
    C. RHR pump 2D auto starts but decay heat removal decreases.
  16. Unit Two is in Shutdown Cooling using RHR Pump 2B. A large line break results in the following plant conditions:

    RPV level +15 inches
    RPV pressure 90 psig
    Drywell pressure 0.9 psig

    How will RHR Loop 2B respond?


    A. Shutdown cooling isolates and RHR pump 2B trips.
    B. RHR pump 2D auto starts and decay heat removal increases.
    C. RHR pump 2D auto starts but decay heat removal decreases.
    D. RHR Pump 2B remains running and RHR pump 2D remains off.
    A. Shutdown cooling isolates and RHR pump 2B trips.
  17. Following a Recirculation line break occurs on Unit One (1).
    Plant conditions are:

    RPV level 20 inches
    RPV pressure 310 psig
    Drywell pressure 16 psig

    Following RPV level restoration, all RHR pumps have been overridden off to control RPV level. If the LPCI INITIATION SIGNAL reset pushbutton is depressed for LPCI LOOP A, Loop A RHR pumps will:

    A. restart immediately.
    B. restart 10 seconds later.
    C. remain OFF, Loop B RHR pumps remain OFF.
    D. remain OFF; Loop B RHR pumps restart immediately.
    C. remain OFF, Loop B RHR pumps remain OFF.
  18. Following a Recirculation line break occurs on Unit One (1).
    Plant conditions are:

    RPV level 20 inches
    RPV pressure 310 psig
    Drywell pressure 1.2 psig

    Following RPV level restoration, all RHR pumps have been overridden off to control RPV level. If the LPCI INITIATION SIGNAL reset pushbutton is depressed for LPCI LOOP A, Loop A RHR pumps will:

    A. restart immediately.
    B. restart 10 seconds later.
    C. remain OFF; Loop B RHR pumps remain OFF.
    D. remain OFF; Loop B RHR pumps restart immediately.
    A. restart immediately.
  19. Following a Recirculation line break occurs on Unit One (1).
    Plant conditions are:

    RPV level 20 inches
    RPV pressure 310 psig
    Drywell pressure 1.2 psig

    Following RPV level restoration, all RHR pumps were overridden off to control RPV level. If the CORE SPRAY INITIATION, SIGNAL reset pushbutton is depressed for Core Spray Loop “A” and “B” and then the LPCI INITIATION SIGNAL pushbutton is depressed for Loop “A” only. Loop “A” RHR pumps will restart:


    A. 10 seconds later, Loop B RHR pumps remain off.
    B. immediately, Loop B RHR pumps restart 10 seconds later.
    C. immediately, Loop B RHR pumps restart immediately.
    D. 10 seconds later, Loop B RHR pumps restart 10 seconds later.
    A. 10 seconds later, Loop B RHR pumps remain off.
  20. During normal power operation of Unit Two, an ECCS Division I Trip Cabinet Trouble alarm is received. Investigation shows that both power supplies to the trip cabinet (XU-63) have failed and all associated trip unit meters indicate downscale with no trip lights lit.

    A DBA LOCA then occurs resulting in Reactor water level rapidly dropping below the Top of Active Fuel and rapid Reactor depressurization.

    How will Core Spray 2A and RHR LPCI Loop 2A respond?
    Core Spray 2A and LPCI Loop 2A will both auto initiate.
  21. Unit Two is operating at rated power with the following electric plant status:

    E6 480 V Main Breaker has tripped on overcurrent

    A line break on Unit Two requires placing drywell and suppression chamber sprays in service. E Bus crossties have not been performed. RHR Loop 2B can be placed in:
    drywell spray only
  22. Unit Two is at rated power with RHR Loops 2A and 2B in standby when annunciator RHR RELAY LOGIC A PWR FAILURE (A-1 2-8) alarms. The DC supply circuit breaker to the RHR 2A initiation logic is tripped and will not reset.

    A line break in the drywell then results in the following plant conditions:

    Reactor level 25" (N026A/B)
    Reactor pressure 150 psig
    Drywell pressure 20 psig

    The 2A and 2C RHR Pumps are:
    running and injecting to the RPV.
  23. A LOCA has occurred in the Unit Two drywell with the following sequence of events:

    1200 Drywell pressure rises above 1.7 psig.
    1204 RPV level drops below the LPCI initiation setpoint
    1206 RPV pressure drops to the LPCI initiation setpoint

    Which one of the following is correct for the LPCI Inboard Injection Valve (E11-F015) and the LPCI Outboard Injection Valve (E11-F017)?

    The operator can close:
    E11-F017 no sooner than 1211. E11-F015 cannot be closed.
  24. Unit Two is in Mode 2 and preparing to place the Mode Switch to Run per GP-03. The
    RCIC system is discovered to be inoperable

    Can Unit Two place the Mode Switch to Run?


    A. No, this is prohibited by LCO 3.0.4.
    B. Yes, this is allowed by LCO 3.0.4.a.
    C. Yes, this is allowed by LCO 3.0.4.b.
    D. Yes, this is allowed by LCO 3.0.4.c.
    A. No, this is prohibited by LCO 3.0.4.


    Mode change cannot be made per LCO 3.0.4.a since operation in Mode 1 with RCIC Inoperable is limited to 14 days. Mode change per LCO 3.0.4.b is not allowed since LCO 3.5.3 specifically states in a note that LCO 3.0.4.b is not applicable to RCIC. Mode change cannot be made per LCO 3.0.4.c since there is no specific allowance in stated in LCO 3.5.3. LCO 3.0.4 therefore prohibits the mode change.
  25. Unit Two is operating at full power.

    2B RHR and 2B RHR SW pumps have been placed in Suppression Pool Cooling to
    lower torus temperature.

    A subsequent LOCA causes reactor water level to drop rapidly.

    Plant conditions are as follows:

    Drywell Pressure 18.1 psig
    Torus Pressure 13.7 psig
    Reactor Pressure 885 psig
    Reactor water level 36 inches
    E11-F0488 Closed

    Which one of the following describes the effect these conditions will have on the status
    of Suppression Pool Cooling?


    A. 2B RHR and 2B RHR SW pumps remain running E11-F0488 will auto open
    B. 2B RHR and 2B RHR SW pumps remain running E11-F0488 will remain closed
    C. ONLY the 2B RHR SW Pump will trip E11-F048B will auto open
    D. ONLY the 2B RHR SW Pump will trip E11-F048B will remain closed
    C. ONLY the 2B RHR SW Pump will trip E11-F048B will auto open


    • The student must first recognize that an RHR initiation signal is present. (LL3) Upon receipt of the initiation signal, the HX bypass valve will receive an auto open signal and will be prevented from closing
    • for 3 minutes and RHR SW will receive a trip signal.
  26. Unit Two was operating at rated power with DG3 under clearance. A line break in the drywell occurred simultaneously with a loss of off-site power.

    Plant status:

    Core Spray pump 2B Injecting to the RPV
    RHR Pumps 2B/2D Running in drywell spray
    RHR Pump 2C Injecting to the RPV
    N RHR room temp 95°F
    S RHR room temp 105°F
    HPCI room temp 115°F
    Core Spray 2B room temp 95°F
    E3/E7 De-energized

    Assuming no operator action, what is the status of the ECCS room coolers?

    A. No room coolers are running.
    B. Core spray 2B room cooler only is running.
    C. RHR 2A and Core Spray 2B room coolers are running.
    D. RHR 2B and Core Spray 2B room coolers are running.
    D. RHR 2B and Core Spray 2B room coolers are running.


    Core Spray room cooler starts based on pump breaker position, pump running. Cooler on (no temperature start). RHR coolers start based on temperature. Both coolers start on 98°F in either RHR room or on 120°F in the HPCI room for RHR Room Cooler A and 145°F in HPCI room for RHR Room Cooler B. Based on S RHR room temp, both RHR Room coolers should be running based on temperature, but with the loss of E3/E7, only fan 2B has power.
  27. A LOCA occurs on Unit One concurrent with a LOOP on both Units.
    A DG3 lockout occurs due to a protective relay actuation.
    Which one of the following is the response of the Unit One Low Pressure ECCS systems?
    There will be injection from _______ of Core Spray.
    There will be injection from two RHR pumps in _________.


    A. both loops
    only one loop

    B. only one loop
    only one loop

    C. both loops
    both loops

    D. only one loop
    both loops
    • A. both loops
    • only one loop


    4 KV Bus E3 supplies power to bus E7 which supplies power to RHR Loop A injection valve F017A. With this valve de-energized, only loop B will inject. Both Core Spray loops are powered from Unit 1 buses E1 and E2.
  28. Unit One failed to scram with the following plant conditions:

    Reactor Power 3%
    RPV Water Level -55 inches (N036)
    RPV Pressure 800 psig
    Suppression Pool 115° F

    Which one of the following actions, if any, is required to open suppression pool cooling valves (E11-F024 and E11-F028)?


    A. Place the Think Switch to Manual only.
    B. No overrides are necessary.
    C. Place the Think Switch to Manual first and then bypass the 2/3rd core height interlock.
    D. Bypass the 2/3rd core height interlock first and then place the Think Switch to Manual.
    D. Bypass the 2/3rd core height interlock first and then place the Think Switch to Manual.


    • LOCA signal is sealed in due to being less than LL3 (45 inches). RPV water level is less than 2/3rd core
    • height (-47 inches); therefore, the keylock switch and then the Think switch is required (sequencing is
    • essential). The RHR SW pumps tripped on LL3 and can be overriden anytime (no sequence required).

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