Ventilation

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Author:
heidin
ID:
156513
Filename:
Ventilation
Updated:
2012-05-30 17:25:45
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SBGT RB HVAC TB CB ILC
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  1. During accident conditions on Unit Two, primary containment is being vented through
    SBGT trains due to high containment pressure. SBGT 2A status:

    Fan Control Pref A
    Fan On Red Light Lit
    Emerg Oper Red Light Out
    OH 180°F Red Light Out
    OH 210°F Red Light Out

    How will SBGT Fan 2A and the Train 2A automatic deluge valve respond if the
    charcoal bed temperatures rise above 210°F? SBGT Fan 2A:

    A. remains running, the deluge valve does not open.
    B. trips, the deluge valve opens and floods the charcoal beds.
    C. trips, the deluge valve opens, but does not flood the charcoal beds.
    D. remains running, the deluge valve opens, but does not flood the charcoal beds.
    C. trips, the deluge valve opens, but does not flood the charcoal beds.


    TS·3 through 6 monitor charcoal bed temperature. Any of these switches reaching 210°F will trip the running fan and initiate the deluge valves, unless train inlet temperature is >180°F. Since the Emerg Oper Red light is off, inlet temperature is <180°F. Although the deluge valve opens, no flow to the charcoal bed since the manual isolation valves in the deluge supply are maintained closed.
  2. Unit Two is in a refueling outage. A spent fuel bundle is dropped causing an evacuation of all personnel from the refuel floor due to high radiation. The operator observes the following alarms on UA-03 and system status;

    Area Rad Refuel Floor High Alarm sealed in
    Process OG Vent Pipe Rad Hi Has NOT alarmed
    Process Rx Bldg Vent Rad Hi Alarmed but is now clear
    Process Rx Bldg Vent Rad Hi-Hi Alarm sealed in
    Reactor Building HVAC Isolated
    Standby Gas Treatment Not running
    Purge Exhaust Fans Aligned for primary containment ventilation

    What operator action is required?

    A. Restart reactor Building HVAC and align for refueling operation.
    B. Start SBGT and isolate the primary containment ventilation lineup.
    C. Maintain the primary containment ventilation lineup and start SBGT.
    D. Maintain SBGT in standby and isolate the primary containment ventilation lineup.
    B. Start SBGT and isolate the primary containment ventilation lineup.


    No auto actions from Area Rad. Main Stack has not alarmed (flowpath for Purge Fans) but primary containment ventilation (group 6 and SCIDs associated with purge fans) should auto close on Rx Bldg Vent Rad Hi-Hi, as well as Rx Bldg HVAC isolation & SBGT start. The Hi alarm is from recorder which can clear if rad level drop following successful isolation. Hi-Hi seals in indicates trip setpoint has been exceeded and automatic actions have failed.
  3. Which of the following are automatic start signals for Standby Gas Treatment System?


    A. Reactor Building Area High Radiation (100 mrem)
    High Drywell Pressure (1.5 psig)
    Reactor Building Ventilation Radiation Upscale (4 mR/hr)
    Low Reactor Water Level (Low Level 2)

    B. High Drywell Pressure (2.0 psig)
    Reactor Building Ventiltion Radiation Upscale (4 mR/hr)
    Low Reactor Water Level (Low Level 3)
    Reactor Building Ventilation Supply Air Temperature High (140 F)

    C. Reactor Building Area High Temperature (140 F)
    Low Reactor Water Level (Low Level 1)
    High Drywell Pressure (2.0 psig)
    Main Stack High Radiation Upscale

    D. High Drywell Pressure (2.0 psig)
    Reactor Building Ventilation Radiation Upscale (4 mR/hr)
    Low Reactor Water Level (Low Level 2)
    Reactor Building Ventilation Exhaust Air Temperature High (140 F)
    • D. High Drywell Pressure (2.0 psig)
    • Reactor Building Ventilation Radiation Upscale (4 mR/hr)
    • Low Reactor Water Level (Low Level 2)
    • Reactor Building Ventilation Exhaust Air Temperature High (140 F)

  4. Unit Two is operating at rated power with the following containment parameters:

    Drywell Pressure 0.8 psig
    Torus Pressure 1.2 psig

    Torus venting is placed in service per 2OP-10, Standby Gas Treatment System Operating Procedure.

    Which one of the following identifies the SBGT alignment and also identifies how containment pressure will initially respond as the torus is being vented?


    A. Align flow through both SBGT trains;
    Drywell Pressure will lower at the same rate as Torus Pressure.

    B. Align flow through both SBGT trains;
    Drywell Pressure will remain steady.

    C. Align flow through one SBGT train only;
    Drywell Pressure will lower at the same rate as Torus Pressure.

    D. Align flow through one SBGT train only;
    Drywell Pressure will remain steady.
    • B. Align flow through both SBGT trains;
    • Drywell Pressure will remain steady.

  5. Unit Two is operating at rated power. The 2A·1 and 28·2 Isophase Bus Duct Cooling
    Fans are operating, and the 2A-2 and 2B·1 fans are in standby.

    A loss of TBCCW flow is sensed to the cooling coil #1 due to a failed flow switch.
    Isophase Bus Cooling Wtr Flow-Low (UA-13 2-6) alarms.

    How will the Isophase Bus Cooling system respond?

    A. Fan 2A·1 only trips. fan 2A-2 only auto starts.
    B. Fan 2A·1 only trips. fan 2B-1 only auto starts.
    C. Fans 2A-1 and 2B·2 trip, fans 2A·2 and 2B·1 auto start.
    D. Fans 2A·1 and 2B-2 remain running, fans 2A·2 and 2B·1 auto start.
    B. Fan 2A·1 only trips. fan 2B-1 only auto starts.


    On a loss of TBCCW to a single coil. the fan running on that coil trips after a 30 second TO. and its standby fan starts. This leaves both fans in operation on the coil that has TCC flow sensed. Both fans trip and both fans auto start on loss of TCC to both coils. or on low air flow. Interlocks prevent running 2A·1 and 2B·1 or 2A-2 and 2B-2 at thesame time.
  6. A steam leak at the MSR manway exists with the following conditions:

    AREA RAD TURBINE BLDG HI In alarm
    Turbine Rotor Wash Down Area ARM Increase from 2 mr/hr to 300 mr/hr
    Turbine Building CAMs Alarming
    Turbine Building WRGM Increasing trend
    Turbine Building Evacuation Has been directed

    Which one of the following choices completes the statements below in accordance with 0AOP-05.0 Radiactive Spills, High Radiation, and Airborne Activity, and 0PEP-02.1, Initial Emergency Actions?

    Ensure Turbine Building HVAC is operating in the ___________ mode of operation.

    The highest emergency action level classification that is required for these conditions is ___________.

    A. Recirc
    Unusual Event

    B. Recirc
    Alert

    C. Once through
    Unusual Event

    D. Once through
    Alert
    • A. Recirc
    • Unusual Event


    System knowledge that it goes into recirc mode of operation. Based on rad conditions once through ventilation is required to isolated. An evacuation based on confirmed rad conditions is an unusual event notification.
  7. The Control Building Ventilation system has initiated in the radiation protection mode.
    The alignment of system controls is:

    Emergency Filtration Fan A Pref
    Emergency Filtration Fan B Stby

    Emergency Filtration Fan A has been running for 10 minutes when a high temperature
    is sensed in the Train A charcoal bed. Assuming the radiation initiation signal is still
    present, Emergency Filtration Fan A will:

    A. immediately trip, Fan B auto starts.
    B. immediately trip, Fan B must be manually started.
    C. remain running, the operator should start Fan B and secure Fan A.
    D. remain running, Fan A should be left running due to the high radiation condition.
    A. immediately trip, Fan B auto starts.


    High temperature in the charcoal bed trips the running fan even during emergency run. Since CBAEF Fan B is in Standby, that fan will auto start when the logic senses the tripof Fan A.
  8. Unit Two is performing heatup and pressurization of the Reactor. Mechanical Vacuum Pumps are in operation to establish condenser vacuum. A control rod drop accident occurs resulting in the following Radiation Monitor status:

    Main Steam line Rad Hi trip on channels A, B, C, & D
    Main Steam Line Rad Hi-Hi trip on channels A & D only
    Control Building Vent Air Intake Plenum Channel 2 @ 6 mr/hr
    Control Building Vent Air Intake Plenum Channel 3 @ 8 mr/hr

    What automatic action(s), if any, is(are) expected to occur?

    A. No automatic actions are expected to occur.
    B. Mechanical Vacuum Pumps isolate and trip only.
    C. Control Building HVAC initiates in the radiation protection mode only.
    D. Mechanical Vacuum Pumps isolate and trip, and Control Building HVAC initiates in the radiation protection mode.
    D. Mechanical Vacuum Pumps isolate and trip, and Control Building HVAC initiates in the radiation protection mode.


    MSL Rad Hi-Hi (not Hi) isolates and trips vacuum pumps. The logic is 1 out of 2 twice (A or C plus B or D). Since the 1 of 2 twice is satisfied, the vacuum pumps trip. Either channel of control building intake reading >7 mr/hr will initiate CREV.
  9. The Control Building HVAC system is in the normal mode of operation with Emergency Filtration (CBEAF) fans not running and aligned as follows:

    CBEAF A STBY
    CBEAF B PREF

    A single ionization (smoke) detector in Control Building zone C5 senses smoke and trips. How will Control Building HVAC respond?


    A. CBEAF A will immediately start and Control Building HVAC shifts to the fire protection mode.
    B. CBEAF B will immediately start and Control Building HVAC shifts to the fire protection mode.
    C. Control Building HVAC remains in the normal mode of operation until a detector in zone C4 trips.
    D. Control Building HVAC remains in the normal mode of operation until a second detector in zone C5 trips.
    C. Control Building HVAC remains in the normal mode of operation until a detector in zone C4 trips.
  10. Which one of the following identifies the Unit differences for the CREV system control and indications at the RTGB?


    A. Unit One has indication and controls
    Unit Two has no indication or control

    B. Unit One has indication only
    Unit Two has indication and controls

    C. Unit One has no indication or control
    Unit Two has indication and controls

    D. Unit One has indication and controls
    Unit Two has indication only
    • B. Unit One has indication only
    • Unit Two has indication and controls

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