Cooling

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Author:
heidin
ID:
156496
Filename:
Cooling
Updated:
2012-05-30 16:53:36
Tags:
SW RCC TCC FPC ILC
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  1. Unit Two is operating at power with CSW pump 2C under clearance. CSW pumps 2A and 2B are running. CSW pump 2A trips. CSW header pressure lowers to 40 psig and SW-V3 and V4 close to the throttled position. CSW header pressure recovers to 70 psig when SW-V3 and V4 close to the throttled position.

    TBCCW HX Outlet Temp High and TBCCW Head Tank Level Hi/Lo alarms are sealed in. TBCCW discharge header pressure is 78 psig. What action is directed by plant procedures that will help stabilize plant conditions?

    A. Ensure SW-V442 is full open.
    B. Place TBCCW pump 2C in service on Unit One.
    C. Close SW-V294 and V295, then re-open SW·V3 and V4.
    D. Place TBCCW heat exchanger 2C in service using Unit One CSW.
    D. Place TBCCW heat exchanger 2C in service using Unit One CSW.


    Placing 2C TBCCW HX in service using the unaffected unit's SW is directed by AOP·19.0 and also by APP UA-03 3-4 for TBCCW outlet temp hi. AOP-19 also directs placing all available TBCCW pumps is service, but header pressure at 78 psig (near top of green band) indicates another pump is not needed, and Unit One would be the wrong Unit to place the pump in service on. Ensuring SW-V442 open is required action when header pressure approaches shut-off head (approx 90 psig). 78 psig is in green band. Closing SW-V294 and 295 is directed only to isolate a suspected leak.
  2. Unit One Nuclear Service Water (NSW) pumps are aligned as follows:

    NSW 1A Running in Auto
    NSW 1B In Manual not running (in preparation for pump starting)

    Off-site power is lost. How will NSW pumps 1A and 1B respond when the DGs re-energize their E Buses?


    A. NSW Pumps 1A and 1B will start five seconds after the DGs energize their E Buses.
    B. NSW Pumps 1A and 1B will start immediately when the DGs energize their E Buses.
    C. NSW Pumps 1A will start five seconds after the DGs energize their E Buses. NSW Pump 1B will not auto start.
    D. NSW Pumps 1A will start immediately when the DGs energize their E Buses. NSW Pump 1B will not auto start.
    B. NSW Pumps 1A and 1B will start immediately when the DGs energize their E Buses.


    NSW Pumps sequence on in 5 seconds if a LOCA signal (and bus has power) is present and immediately (when bus undervoltage clears) after a LOOP without a LOCA. Auto start on both LOOP and LOCA is independent on Mode switch position.
  3. Unit 1 is operating at power with the following Nuclear Service Water pump alignment:

    NSW Pump 1A running
    NSW Pump 1B under clearance
    CSW Pump 1A is in standby aligned to the NSW header

    Unit 1 loses Off-Site Power. All four DGs auto start and DGs 1 and 2 tie to their respective E Buses. NSW Pump 1A auto starts:


    A. 5 seconds after E1 is energized, CSW Pump 1A remains in standby.
    B. Immediately when E1 is energized, CSW Pump 1A remains in standby.
    C. 5 seconds after E1 is energized, CSW Pump 1A auto starts on low header pressure.
    D. Immediately when E1 is energized, CSW Pump 1A auto starts on low header pressure.
    D. Immediately when E1 is energized, CSW Pump 1A auto starts on low header pressure.


    • A CSW Pump will NOT auto start on low header pressure on either the nuclear or conventional header if there is an undervoltage condition on the BOP bus that supplies normal power to the CSW Pump’s associated E Bus (i.e. BOP Bus 2C for CSW Pump 1A). SD-43
    • So – what is the NORMAL power source for the 1A CSW pump? Unit 2 – the unit without a LOOP.
  4. Unit Two experiences a Loss of Off-Site Power (LOOP) with DG4 under clearance.

    Which one of the following predicts the NSW and CSW pump response when the DG3 ties to bus E3?


    A. NSW pump 2A and CSW pump 2A start immediately.
    B. NSW pump 2A and CSW pump 2A start after a 5-second time delay.
    C. NSW pump 2A starts immediately and CSW pump 2A does not start.
    D. NSW pump 2A starts after a 5 second time delay and CSW pump 2A does not start.
    C. NSW pump 2A starts immediately and CSW pump 2A does not start.


    2A NSW pump and 2A CSW pump are both powered from emergency bus E3. On a LOOP, they will lose power until bus E3 is reenergized from DG3. Immediately following reenergization of E3, 2A NSW will start. With a concurrent LOCA, a 5-second time delay exists. 2A CSW will remain off.
  5. With Unit Two operating at full power, an inadvertent initiation of Core Spray A occurs and cannot be reset.

    Which one of the following identifies the status of the RBCCW system and also identifies the procedure that contains the guidance for restoring RBCCW system cooling?


    A. SW-V106, RBCCW HXS SW INLET VLV, has shut;
    0AOP-18, Nuclear Service Water System Failure.

    B. SW-V106, RBCCW HXS SW INLET VLV, has shut;
    0AOP-19, Conventional Service Water System Failure.

    C. All RBCCW pumps have tripped;
    0AOP-18, Nuclear Service Water System Failure.

    D. All RBCCW pumps have tripped;
    0AOP-19, Conventional Service Water System Failure.
    • A. SW-V106, RBCCW HXS SW INLET VLV, has shut;
    • 0AOP-18, Nuclear Service Water System Failure.


    Cooling has been lost due to the CS signal closing the V106 valve. To restore cooling RCC would need to be put on CSW. This is accomplished in AOP-18.
  6. Unit 1 is operating at 100% power with the following TBCCW alignment:

    1A TCC pump Under clearance
    1B TCC pump In service
    2C TCC pump InService on Unit One

    Maintenance is being performed on Turbine Building MCCs, which results in a loss of power to MCC 2TH. Considering the power loss, TBCCW flow on Unit 1:


    A. is provided by the 1B and 2C TCC pumps. No additional actions are required.
    B. is provided by the 1B TCC pump only. 2C TCC pump has tripped and can not be started.
    C. is provided by the 1B TCC pump. The 2C TCC pump can be restored through manual actions.
    D. is lost. No TCC pumps remain in service. Actions are required to be taken for a compete loss of TBCCW.
    A. is provided by the 1B and 2C TCC pumps. No additional actions are required.


    2C has an ABT that will automatically shift power to 1TH. The pump will remain in service to provide nomal system flow. 1B TCC is not affected by the loss of power.
  7. The Supplemental Spent Fuel Pool Cooling System (SSFPCS) is operating with:

    ONE primary pump and TWO heat exchangers in service.
    TWO secondary pumps and TWO cooling towers in service.

    How will closing the primary side HX outlet valve (V-73-2A) for the “A” heat exchanger (HX-73A) affect operaton of the SSFPCS?


    A. The primary pump will trip on thermal overload which can be reset locally.
    B. The secondary pump will trip causing a trip of the primary pump on low d/p.
    C. The system will continue to operate with a reduced heat exchange capability until the valve is re-opened.
    D. The system will continue to operate; however, leaks will occur from Primary side to the secondary side of the “B” heat exchanger (HX-73B).
    C. The system will continue to operate with a reduced heat exchange capability until the valve is re-opened.
  8. Fuel Pool Level Low (A-04 6-6) is in alarm with a report of slowly lowering level. Normal makeup via the skimmer surge tank makeup valve has been initated and the decrease slows but level continues to lower.

    What is the next system which should be used to makeup to the fuel pool in order to stop the level decrease?

    A. RHR Loop A through the RHR Loop Cross Tie.
    B. Demineralized Water via Core Spray A Keepfill.
    C. Demineralized Water Header stations.
    D. Fire Protection Hose stations.
    C. Demineralized Water Header stations.

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