SW

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Author:
skrappie1
ID:
109587
Filename:
SW
Updated:
2015-12-03 14:28:37
Tags:
sw advanced systems
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sw
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  1. 100% required service water flow with 3 pumps?
    100% of the required service water post accident cooling capability can be provided by 3 service water pumps even with service water flow being provided to both the CAC's and non critical service water header.
  2. LCO 3.7.9. Ultimate Heat Sink
    • LCO 3.7.9.: The ultimate heat sink shall be operable
    • APP: Modes 1-4

    -no <= 1 hour actions
  3. 100% required service water post accident cooling capability can be provided by any 2 service water pumps if?
    • non critical service water header isolation valve, CV-1359, is operable
    • OR
    • plant conditions allow adequate containment cooling provided with out reliance on CAC's and one service water containment isolation valve, CV-0824 OR CV-0847 is operable.
  4. Effects on service water pumps on loss of offsite power with or without a SIAS?
    • Normal Shutdown sequencer or the DBA sequencer will start all 3 service water pumps
    • P-7A and P-7B start 10 seconds after D/G breaker closure
    • P-7C starts 26 seconds after D/G breaker closure

    Only difference is which sequencer does the starting.
  5. 100% of required service water post accident cooling capability can be provided by 1 service water pump if?
    • The non critical service water header isolation valve, CV-1359, is operable
    • AND
    • Plant conditions allow adequate containment cooling to be provided with out reliance on CAC's and one service water containment isolation valve, CV-0824 or CV-0847, is operable
  6. Effects of loss of offsite power without SIAS on the service water system?
    • normal S/D sequencer starts all 3 service water pumps
    • P-7A/B start 10 seconds after D/G breaker closure
    • P-7C starts 26 seconds after D/G breaker closure
  7. LCO 3.7.8. Service Water System
    LCO 3.7.8.: Two service water trains shall be operable

    APP: Modes 1-4

    • Actions: C. less than 100% of the required post accident service water cooling capacity available
    • -Enter LCO 3.0.3.
    • --Immediately
  8. When is the Ultimate Heat Sink considered operable?
    • </= 85F
    • >/= 568.25 Ft above sea level
  9. Consequences of opening VHX-1,2,3,4 inlet valves prior to opening the containment isolation valves (CV-0847,CV0824)
    Could cause hydraulic transients on service water system
  10. Service water pump capacity and power supplies
    • 8000 gpm each @ 140 ft
    • P-7A/C-D bus
    • P-7B-C bus
    • P-7B has a remote/local transfer switch (RLTS)
  11. What must you do when all high capacity CAC outlet valves are open and both critical service water header pressure are > 70 psig or operating service water pump discharge pressure > 73 psig and 3 service water pumps running?
    • Shutdown one of the running service water pumps to establish 2 pumps running
    • -prevents low flow conditions on the pumps
  12. What service water valves have N2 backup?
    • CAC's service water return and supply CV-0824 and CV-0847
    • -CV-0847 (supply)-N2 station 1A
    • -CV-0824 (return)-N2 station 3B
  13. How to place a service water pump in standby, how to remove it from standby
    • Must have other 2 pumps running
    • Push standby button between red and green lights
    • To remove standby feature, you must trip the pump
  14. Consequences of operating 3 service water pumps and 2 dilution water pumps with the plant offline
    • Could exceed NPDES discharge limits
    • -135.2 million gallons per day.
  15. Service water pump standby feature
    • Feature armed by depressing amber standby lamp pushbutton
    • If either of the other 2 pumps pressure switches is less than 40 psig, the standby service water pump starts
  16. Why must 2 service water pumps be in service to place an idle pump in standby?
    it will start if either of the other 2 pumps have low pressure, if only 1 running then you have low pressure on the other pump
  17. Consequences of opening VHX-1,2,3,4 inlet valves prior to opening the outlet valves?
    Hydraulic transients to service water piping
  18. Fire protection interface with service water system
    • FPS can supply backup to critical service water system
    • -1500 gpm each pump (4500 gpm total)
    • FPS can supply water to the screen wash system
    • P-25A/B/C can spare jockey pump
  19. Service water system response to safety injection actuation signal (SIAS)?
    • All 3 service water pumps start
    • non-critical service water header isolation (CV-1359) closes
    • -SIAS seals valve in the closed position
    • CAC's high capacity outlet valves open
    • -SIAS seals valves open
    • VHX-4 CAC inlet valve closes (air to open)
    • -SIAS seals valve closed
  20. Service water system response to RAS?
    • Both CCW HX's high capacity outlets open to their hard stops
    • -20% open (3300 gph/each HX)
    • CCW HX outlet TCV's close
  21. At what differential pressure do you get basket strainer high dP alarms?
    7 psid

    At 12 psid you declare the SW pump INOPERABLE
  22. What is the design basis of the SWS?
    The design basis of the SWS is for one SWS train, in conjunction with the CCW System and a 100% capacity containment cooling system(containment spray, CACs, or a combination), removing core decay heat between 20 to 40 minutes following a design basis LOCA. This prevents the containment sump fluid from increasing in temperature during the recirculation phase following a LOCA and provides for a gradual reduction in the temperature of this fluid as it is supplied to the Primary Coolant System by the safety injection pumps. The SWS is designed to perform its function with a single failure of any active component, assuming the loss of offsitepower.

    The SWS, in conjunction with the CCW System, also cools the plant from Shutdown Cooling (SDC) entry Condition, as discussed in the FSAR,Section 6.1 (Ref. 2) to MODE 5 during normal and post accident operations. The time required for this evolution is a function of the number of CCW and SDC System trains that are operating. This assumes that the maximum Lake Michigan water temperature of LCO 3.7.9, “Ultimate Heat Sink (UHS),”occurs simultaneously with maximum heat loads on the system.
  23. What do you need for 100% of the required SWS post acccident cooling?
    One hundred percent of the required SWS post accident cooling capability can be provided by any ONE SWS pump if:

    1. The non-critical SWS header isolation valve, CV-1359, is OPERABLE, and

    2. Plant conditions allow adequate containment cooling to be provided without reliance on CACs and one SWS Containment Isolation Valve,CV-0824 or CV-0847, is OPERABLE.

    One hundred percent of the required SWS post accident cooling capability can be provided by any TWO SWS pumps if:

    1. The non-critical SWS header isolation valve, CV-1359, is OPERABLE, or

    2. Plant conditions allow adequate containment cooling to be provided without reliance on CACs and one SWS Containment Isolation Valve, CV-0824 or CV-0847, is OPERABLE.

    One hundred percent of the required SWS post accident cooling capability can be provided by THREE SWS pumps even with SWS flow being provided to both the CACs and the Non-critical SWS header.
  24. What are the conditions for frazil ice?
    Water temperature is at or below 33F

    Air temperature is at or below 25F

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