crhvac

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skrappie1
ID:
110752
Filename:
crhvac
Updated:
2012-01-10 10:43:58
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crhvac advanced systems
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crhvac
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  1. Purpose of DPIC-1660/1659 control room differential pressure controllers?
    Controls pressure at 0.125" water above atmospheric
  2. Power supply for conrol room normal supply fans (V-95/96)?
    MCC 25/26
  3. What interlocks are associated with V-94 purge fan?
    • When V-94 starts
    • -D-15 opens
    • -D-16 opens
    • -D-3(10) close
  4. Why is a positive pressure maintained in the control room, viewing gallery, TSC, and MERs?
    Prevents airborne radioactive material from entering the controlled area subsequent to accidents that could result in contaminated outside air.
  5. Why is purge mode blocked during emergency mode?
    You would be unable to maintain control room pressure
  6. What is the purpose of the yellow light on V-95/96 handswitch?
    • Local control light
    • -tells you if the local switch is in anything other than remote
  7. How does CV-1655(CV-1656), cooling water regulating valves to VC-11(VC-10) fail on a loss of instrument air?
    • Fails open (full critical sw flow)
    • -causes suction pressure to lower
    • -compressor will trip on low suction pressure
  8. What are the power supplies for control room emergency fans V-26A/B?
    • V-26A
    • -MCC-25
    • V-26B
    • -MCC-26
    • Both auto start on CHP/CHR
  9. What do emergency air filtration units VF-26A(26B) consist of?
    • Fan V-26A(B)
    • -3200 CFM at 10" water (FIC-1711)
    • Prefilters VFP-26A(B)
    • -initial differential pressure clean is 0.5" water, final differential pressure dirty is 1.2" water
    • -60-65% efficient
    • Electric heating coil VHX-26A/B
    • -powered from MCC-25/26
    • Upstream and downstream hepa filters VFH 26A/B
    • -maximum differential pressure is 10" water
    • Charcoal filters
    • Ductwork, instruments and controls
  10. Damper 7(14) controls
    • Auto
    • -opens when the associated V-26 starts and closes when it is secured

    • Close
    • -closes damper

    Local control brings in yellow local control light
  11. What do air handling units V-95(V-96) consist of?
    • Medium efficency filter
    • -60-65% efficient, glass fiber
    • -high differential pressure alarm at 0.75" water
    • Heating coil (normally off)
    • -177kw (MCC-7/8)
    • Cooling coil VC-11(VC-10)
    • -cooled to 52oF
    • -12,500 CFM (11,340 recirc, 1,160 outside)
    • Centrifugal fan
    • -25HP
    • -12,500 cfm
    • Ductwork, instrument and controls
  12. How do VC-11(VC-10) fail on a CHP/CHR?
    • Condensing units are shutdown
    • If cooling is required, then you must take the control switch to CHP/CHR OVRD position
  13. Why is shift manager permission required prior to recirc mode on CRHVAC?
    RIA-1818A/B are not located in the recirc flow path, thus will not detect adverse radiological conditions
  14. V-94 CR purge fan controls?
    • ON
    • -starts V-94 and repositions dampers
    • OFF
    • -stops purge fan and repositions dampers
    • Has local control
    • -ON/REMOTE/OFF
    • Has local control light
    • -yellow light
  15. Purpose of the control room HVAC system?
    Maintain the control room, tech support center, viewing gallery, and mechanical equipment room environments suitable for continuous personnel occupancy and reliable equipment operation under ALL conditions.
  16. Smoke purge fan V-94
    • Evacuates smoke and/or noxious gas from the control room envelope
    • Both trains of AHUs must be available
    • 8.4 air volume changes/hour
    • 7800 cfm
    • Powered from MCC-79
    • Purge mode is blocked during emergency mode
    • Trips on CHP/CHR
  17. Emergency fan V-26A/B controls
    • On
    • -starts fan and repositions dampers
    • Auto
    • -fan starts 1 minute after CHP/CHR
    • Off
    • -stops fan and repositions dampers
    • Yellow local control light
    • -if local control is in anything other than remote you get the light
  18. What are the power supplies for VC-10/VC-11?
    MCC-25/26
  19. Toilet exhaust fan 16
    • Trips on CHP/CHR or start of either V-26A/B fan
    • D-17,D-18,TD-6 open when the fan is started
  20. What happens to CRHVAC on a CHP/CHR?
    CRHVAC goes to emergency by CHP(4.0psig) and CHR(10R/hr)
  21. Why does pressure change in the control room, viewing gallery, TSC and MERs when CRHVAC is in recirc mode?
    They will depressurize due to lack of makeup air.
  22. What is the consequence of operating in purge mode with outside air temperature <70oF?
    • Freon has an affinity for cold and could be absorbed in the oil and eventually condense into a liquid
    • -this could damage the compressor
  23. CRHVAC humidifiers VH-13/12
    • Powered from MCC-79/80
    • Supplied from domestic water
    • Trips on:
    • -V-95/96 shutdown
    • -associated V-26A/B running
    • -CHP/CHR
    • -high canister water level
    • -high humidity (90%)
    • Set at 40% +/- 5% humidity
    • Not tech spec related
  24. VC-10/11 controls
    • OFF/RESET
    • -turns the unit off
    • -resets the load shed circuitry
    • -resets the circuit after CHP/CHR is reset
    • -resets the safety trip
    • AUTO (normal position)
    • -starts when associated AHU is operating
    • OVRD-CHP/CHR
    • -starts the unit when a standing CHP/CHR signal is present
    • Yellow trouble light
  25. CRHVAC supply fans V-95/96 controls
    • ON
    • -starts the units and aligns dampers
    • Auto
    • -starts fans on CHP/CHR after 1 minute
    • OFF/RESET
    • -secures the unit and aligns dampers
    • -resets load shed circuitry if the fan was not started by the sequencer
    • Can start at the local panel ON/OFF/REMOTE switch
  26. LCO 3.7.11 Control room ventilation (CRV) cooling
    LCO 3.7.11 Two CRV Cooling trains shall be OPERABLE.

    • APP: MODES 1, 2, 3, 4,
    • During CORE ALTERATIONS,
    • During movement of irradiated fuel assemblies,
    • During movement of a fuel cask in or over the Spent Fuel Pool (SFP).

    • Actions:
    • C. Required Action and associated Completion Time of Condition A not met during CORE ALTERATIONS, during movement of irradiated fuel assemblies, or movement of a fuel cask in or over the SFP.
    • -C.1 Place OPERABLE CRV Cooling train in operation. Immediately
    • OR
    • C.2.1 Suspend CORE ALTERATIONS.Immediately
    • -AND
    • C.2.2 Suspend movement of irradiated fuel assemblies. Immediately
    • -AND
    • -C.2.3 Suspend movement of a fuel cask in or over the SFP.Immediately

    • D. Two CRV Cooling trains inoperable during CORE ALTERATIONS, during movement of irradiated fuel assemblies, or movement of a fuel cask in or over the SFP.
    • -D.1 Suspend CORE ALTERATIONS.Immediately
    • AND
    • -D.2 Suspend movement of irradiated fuel assemblies. Immediately
    • AND
    • -D.3 Suspend movement of a fuel cask in or over the SFP.Immediately
  27. What are the effects of a loss of D-11A(D-21A) on the CRHVAC system?
    • Left (right) train CRHVAC fails to emergency mode regardless of the status of operation
    • VC-11(10) trips and will not restart
  28. 3.7.10 Control Room Ventilation (CRV) Filtration
    LCO 3.7.10 Two CRV Filtration trains shall be OPERABLE.

    • NOTE: The control room envelope (CRE) boundary may be opened
    • intermittently under administrative control.

    • APP: MODES 1, 2, 3, 4,
    • During CORE ALTERATIONS,
    • During movement of irradiated fuel assemblies,
    • During movement of a fuel cask in or over the Spent Fuel Pool (SFP).

    • ACTIONS
    • B. One or more CRV Filtration trains inoperable due to inoperable CRE boundary in MODE 1, 2, 3, or 4.
    • -B.1 Initiate action to implement mitigating actions. Immediately

    • D. Required Action and associated Completion Time of Condition A not
    • met during CORE ALTERATIONS, during movement of irradiated fuel assemblies, or during movement of a fuel cask in or over the SFP.
    • -D.1 Place OPERABLE CRV Filtration train in emergency mode. Immediately
    • OR
    • -D.2.1 Suspend CORE ALTERATIONS.Immediately
    • --AND
    • -D.2.2 Suspend movement of irradiated fuel assemblies. Immediately
    • --AND
    • -D.2.3 Suspend movement of a fuel cask in or over the SFP. Immediately

    • E. Two CRV Filtration trains inoperable during CORE ALTERATIONS, during movement of irradiated fuel ssemblies, or during movement of a fuel cask in or over the SFP.
    • OR
    • One or more CRV Filtration trains inoperable due to an inoperable CRE
    • boundary during CORE ALTERATIONS, during movement of irradiated
    • fuel assemblies, or during movement of a fuel cask in or over the SFP.
    • -E.1 Suspend CORE ALTERATIONS Immediately
    • AND
    • -E.2 Suspend movement of irradiated fuel assemblies. Immediately
    • AND
    • -E.3 Suspend movement of a fuel cask in or over the SFP. Immediately

    • F. Two CRV Filtration trains inoperable in MODE 1, 2, 3, or 4 for reasons other than Condition B.
    • -F.1 Enter LCO 3.0.3. Immediately
  29. What are the effects of a loss of Y-10(Y-20) on the CRHVAC system?
    • Left (right) train cannot be operated in the emergency mode
    • If left (right) train is in operation, it will fail to the recirc mode
    • VC-11(10) trips and will not restart.

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