ccw

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skrappie1
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107804
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ccw
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2015-12-04 13:30:13
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ccw advanced systems
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ccw
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  1. CV-0913 ESS pumps CCW supply
    CV-0950 ESS pumps CCW return
    • fail open on loss of air/loss of DC
    • HS-0913A and HS-0950A kept open to prevent single failure criteria from disabling all ESS pumps
    • operated from C-08 or C-33
    • either channel SIAS opens valves
  2. CCW pump ratings/power supplies
    • 6000gpm @ 164 ft
    • shutoff head @ 230ft
    • P-52A/C-C Bus
    • P-52B-D Bus
  3. EK-1170/1171 "Component CLG Hx E54A/B Hi-Lo Temp"
    • high 89F
    • low 71F
  4. CV-0910/0911/0940 CCW containment isolation valves normal position
    • shall be in AUTO
    • -if in open will not close on CHP
  5. CCW HX E-54A/B design
    • 200F
    • 150psig(shell ccw)
    • 125 psig (tube sw)
    • max flow 4700 gpm through shell of each HX
    • -24.1 psid across E-54A
    • -22.0 psid across E-54B
    • -normal(optimum)
    • -1 CCW pump=6-8 psid
    • -2 CCW pump=12-16psid
  6. How do you remove a CCW pump from standby?
    • control switch to trip
    • undervoltage on 1C/1D bus
    • BKR is closed
  7. CV-0947 ESS B train pumps CCW supply
    CV-0948 ESS A train pumps CCW supply
    CV-0949 ESS pumps CCW supply
    • fail open on loss of air/loss of DC
    • normally electrically locked open
    • can also be operated from C-33
  8. Purpose of the hard stops on CCW HX high capacity outlet valves
    • prevents full opening of the valves which could starve other critical SW cooled components
    • hard stops don't work if on their manual operators
  9. EK-1155 "West room ENG. safeguard PPS CLG WTR LO flow"
    9-11 gpm
  10. CCW pump trips
    • manual from control switch
    • manual from BKR
    • load shed
    • overcurrent
  11. CV-0946/CV-0945 CCW HX inlets failure mode
    • fail open on loss of air/loss of DC power
    • maintained full open during plant ops
  12. Required SDC Hxs w/ operable shell side for 1/2/3 CCW pumps
    • 1 operable pump
    • -at least 1 SDC HX w/ operable shell side
    • 2/3 operable pumps
    • -2 SDC HXs w/ operable shell side
  13. EK-1156"East room ENG. safeguard PPS CLG WTR LO flow"
    4-6gpm
  14. CCW design temperature and pressure
    • max temp 140F
    • min temp 65F
    • design pressure of 150psig
  15. CV-0944A, CCW to SFP and RW evaps
    • fails closed on loss of air/loss of DC power
    • closes on SIAS(must reset to open valve)(either channel)
    • bypass position
    • -allows opening of valve with SIAS
    • -if no SIAS signal bypass closes valve
    • -bypass allows cooling of SFP w/a SIAS
    • 3 position switch close/bypass/open
  16. CV-0915 T-3 surge tank vent
    • no handswitch(indicating lights only)
    • normally aligned to vent to room (green light)
    • high radiation vents to gas collection header (red light)
    • fail to gas collection header on loss of air/loss of D-21-2
  17. How many CCW pumps are required and why when stroking open CV-0937/0938 SDC HX CCW inlet valves?
    • ensure at least 2 CCW pumps are in service
    • prevents auto starting standby pump
  18. Automatic starts of CCW pumps
    • low header pressure 80psig
    • -must be in standby
    • ESF actuations or loss of power
  19. CV-0944, CCW to radwaste evaps
    CV-0977B, CCW return from radwaste evaps failure modes/indications
    • fail closed on loss of air/loss of DC
    • closed by either channel SIAS
    • open/closed indication on C-105
    • cannot open until SIAS reset
  20. CV-0918, T-3 surge tank fill
    • no handswitch (indicating lights only)
    • fail closed on loss of air/loss of DC
    • opens @ 47%
    • closes @ 74%
  21. CV-0821/CV-0822 E-54A/B TCVs
    • fail closed on loss of air
    • green light on both valves are closed (no red light)
    • in auto
    • -controls CCW HX outlet temp 72-88F
    • close on RAS (either channel)
    • close on loss of D-11-2
    • 1 handswitch/solenoid controls both
  22. CCW surge tank relief RV-0915 setpoint
    20 psig
  23. What must be done prior to starting a CCW pump that has been drained?
    • must remove standby pump from standby
    • -prevents starting a standby CCW pump due to the inability to completely fill and vent the drained pump
  24. What must be monitored in the CCW system when placing the SDC HXs in service?
    • CCW HX delta-Ps to prevent exceeding flow limits on the CCW HXs
    • -E-54A-24.1psid
    • -E-54B-22.0 psid
    • prevents fretting of CCW HX tubes
  25. CV-0910 CCW to containment
    CV-0911 CCW from containment
    CV-0940 CCW from containment
    • purpose of valves is to isolate CCW from containment on CHP
    • fail open on loss of air/loss of DC power
    • accumulators(4 hrs) on CV-0911/0940 to ensure these 2 valves remain closed on CHP and loss of inst air
    • 3 position keyswitch
    • -close
    • -open-open even on CHP
    • -auto-normally open, will close on CHP
    • --valve reopens on reset of CHP
  26. CCW pump response to SIAS w/ loss of offsite power or just loss of offsite power
    • P-52A starts by left channel sequencer @ 23 seconds
    • P-52B starts by right channel sequencer @23 seconds
    • P-52C enabled for a 2 second window by left channel sequencer @ 40 seconds
    • -starts on low pressure </= 80 psig
    • -if P-52C is required to be in "standby" after an undervoltage condition has cleared, operator must re-push the "standby button"
    • For SIAS:
    • -all valves behave the same as SIAS w/out loss of offsite power
  27. T-3 CCW surge tank normal level
    47-74%
  28. CCW response to CHP
    • same as SIAS except
    • -CV-0910, CCW to containment closes (either channel)
    • -CV-0911, CCW to containment closes (left channel)
    • -CV-0940, CCW from containment closes (right channel)
  29. CCW response to RAS
    • CV-0946, CCW HX inlet opens (left channel)
    • CV0945, CCW HX inlet opens (right channel)
    • CCW HX E-54A/B SW outlets open to hard stops
    • -CV-0823/CV-0826 (either channel)
    • CV-0821/0822 E-54A/B TCVs close (either channel)
  30. CCW response to SIAS w/out loss of offsite power
    • all 3 CCW pumps start 52A/C (left) 52B (right)
    • CV-0937 SDC HX cooling inlet opens (right channel)
    • CV-0938 opens (left channel)
    • CV-0913, ESS supply opens (either channel)
    • CV-0950, ESS CCW return opens (either channel)
    • all above valves must have SIAS reset to close the valves
    • CV-0944A, CCW to SFP and RW evaps closes (either channel)
    • CV-0944, CCW to radwaste evaps
    • -can't be reopened until SIAS is reset
    • CV-0977B, CCW return from RW evaps closes (either channel)
    • -can't be reopened until SIAS is reset
  31. LCO 3.7.7
    Component Cooling Water System
    LCO 3.7.7.: 2 CCW trains shall be operable

    APP: Modes 1-4

    • Actions: C. less than 100% of required post accident CCW cooling capability available
    • -C.1. enter LCO 3.0.3. immediately
  32. EK-1172 "component CLG surge tank T-3 Hi-Lo level"
    • High-93%
    • Low-35%
  33. What are the minimum operating discharge pressures for CCW pumps?
    • 1 HX / 1 Pump = 115 psig
    • 1 HX / 2 or 3 Pumps = not allowed.
    • 2 HX / 1 Pump = 102 psig
    • 2 HX / 2 Pumps = 115 psig
    • 2 HX / 3 Pumps = 129 psig
  34. What leaks into the CCW system?
    • Shutdown Cooling Heat Exchanger may
    • SFP may
    • CRDM seals
    • PCP seal coolers
    • Letdown Heat Exchanger
  35. What components leaking would cause CCW to leak out of the CCW system?
    • Service water
    • Shutdown Cooling Heat Exchanger may
    • SFP may
    • Radwaste Evaporators
    • Charging Pump Lube oil coolers
    • P-55A Fluid Drive Cooler
    • Vac Degas pump seal cooler
    • Reactor Shield Cooling Hx
    • PCP oil coolers
    • Waste Gas compressor
    • PCS sample coolers
    • ESS pump coolers
  36. When is the Left train of CCW considered OPERABLE?
    • The CCW train associated with the Left Safeguards Electrical Distribution Train is considered OPERABLE when:
    • a. CCW pump P-52A is OPERABLE;
    • b. CCW surge tank T-3 and other common components are OPERABLE;
    • c. CCW heat exchanger E-54B is OPERABLE; and
    • d. The associated piping, valves, and instrumentation and controls required to perform the safety related function are OPERABLE.
  37. When is the Right train of CCW considered OPERABLE?
    • The CCW train associated with the Right Safeguards Electrical Distribution Train is considered OPERABLE when:
    • a. CCW pump P-52B is OPERABLE;
    • b. CCW surge tank T-3 and other common components are OPERABLE;
    • c. CCW heat exchanger E-54A is OPERABLE; and
    • d. The associated piping, valves, and instrumentation and controls required to perform the safety related function are OPERABLE.
  38. What do you need for 100% post accident CCW cooling?
    If the CCW side (shell side) of either CCW heat exchanger is out of service, 100% of the required CCW post accident cooling capability cannot be assured.

    • If the SWS side (tube side) of either CCW heat exchanger is out of service, 100% of the required CCW post accident cooling capability can be provided, if other equipment outages are limited. One hundred percent of the post accident CCW cooling can be provided with the SWS side of one CCW heat exchanger out of service if the following equipment is OPERABLE:
    • 3 safety related Containment Air Coolers,
    • 2 Containment Spray Pumps,
    • CCW pumps P-52A and P-52B,
    • 2 SWS pumps,
    • and both Shutdown Cooling Heat Exchangers, and if

     1. One CCW Containment header valve, CV-0910, CV-0911, or CV-0940, is OPERABLE, and

     2. Two CCW isolation valves for the non-safety related loads outside the containment, CV-0944A and CV-0944 (or CV-0977B), are OPERABLE.

    One hundred percent of the required CCW post accident cooling can be provided despite the inoperability of one or more of those CCW valves closed by Safety Injection, which isolate cooling to non-essential loads, provided there are sufficient CCW pumps available to supply the additional flow.

    • One hundred percent of the required CCW post accident cooling capability can be provided by one CCW pump if:
    • both CCW heat exchangers are available and if:

     1. One CCW Containment header valve, CV-0910, CV-0911, or CV-0940, is OPERABLE, and

     2. Two CCW isolation valves for the non-safety related loads outside the containment, CV-0944A and CV-0944 (or CV-0977B), are OPERABLE.

    • One hundred percent of the required CCW post accident cooling capability can be provided by two CCW pumps if:
    • both CCW heat exchangers are available and if:

     1. One CCW Containment header valve, CV-0910, CV-0911, or CV-0940, is OPERABLE, or

     2. Two CCW isolation valves for the non-safety related loads outside the containment, CV-0944A and CV-0944 (or CV-0977B), are OPERABLE.

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