SDC

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Author:
skrappie1
ID:
112886
Filename:
SDC
Updated:
2015-11-17 13:26:28
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SDC advanced systems
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SDC
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  1. 3.9.5 Shutdown Cooling (SDC) and Coolant Circulation - Low Water Level
    LCO 3.9.5 Two SDC trains shall be OPERABLE, and one SDC train shall be in operation.

    APP: MODE 6 with the refueling cavity water level < 647 ft elevation.

    • ACTIONS:
    • A. One SDC train inoperable.
    • -A.1 Initiate action to restore SDC train to OPERABLE status.-IMMEDIATELY
    • OR
    • -A.2 Initiate action to establish the refueling cavity water level ≥ 647 ft elevation.

    • B. No SDC train OPERABLE or in operation.
    • -B.1 Suspend operations involving a reduction in primary coolant boron concentration. IMMEDIATELY
    • AND
    • -B.2 Initiate action to restore one SDC train to OPERABLE status and to operation. IMMEDIATELY
    • AND
    • -B.3 Initiate action to close all containment penetrations providing direct access from containment atmosphere to outside atmosphere. IMMEDIATELY
  2. What is the purpose of the shutdown cooling system?
    • The SDC system is a portion of the safety injection system
    • -removes PCS decay heat during Rx S/D
    • -maintains suitable temperature for refueling and maintenance
    • Designed to cool the PCS from 300oF to refueling temperature assuming a CCW inlet temperature of 90oF.
  3. What are the setpoints for RV-0402 and RV-0403, SDC HX tube side reliefs?
    • 500 psig
    • -protects the tube side of the SDC heat exchangers and piping from overpressure due to ambient temperature rise in the safeguards rooms.
    • -relieves to the safeguards sump.
  4. What is the power supply for HIC-0325A/B, SDC temperature controllers?
    • Y-01
    • Normally closed
  5. What are the power supplies for MO-3015/3016, LPSI pump suctions from the PCS?
    • MO-3015
    • -MCC-1
    • MO-3016
    • -MCC-2
  6. Why must power be maintained to at least one valve(MO-3015/3016) when the PCS is pressurized?
    To maintain the ability to isolate RV-3164,SDC relief, if it fails open.
  7. What are the SDC requirements when we are in reduced inventory?
    • Both trains of SDC shall be operable prior to entry into reduced inventory.
    • The operating SDC pump shall not be switched unless required by ONP-17 "loss of SDC"
    • -may be waived by the ops superintendent
  8. CV-0937/0938, SDC Hx cooling inlets
    • Fail open on a loss of air/DC power
    • CV-0937 opens on right channel SIAS
    • CV-0938 opens on left channel SIAS
    • -valves cannot be closed until SIAS is reset
    • -ensures at least 1 SDC Hx is available during all accident scenarios
    • Operated from C-08 or C-33
  9. 3.9.4 Shutdown Cooling (SDC) and Coolant Circulation - High Water Level
    LCO 3.9.4 One SDC train shall be OPERABLE and in operation.

    • NOTES:
    • 1. The required SDC train may not be in operation for ≤ 1 hour per 8 hour period, provided no operations are permitted that would cause reduction of the Primary Coolant System boron concentration.
    • 2. The required SDC train may be made inoperable for ≤ 2 hours per 8 hour period for testing or maintenance, provided one SDC train is in operation providing flow through the reactor core, and core outlet temperature is ≤ 200°F.

    APP: MODE 6 with the refueling cavity water level ≥ 647 ft elevation.

    • Actions:
    • A. One required SDC train inoperable or not in operation.
    • -A.1 Initiate action to restore SDC train to OPERABLE status and operation. IMMEDIATELY
    • AND
    • -A.2 Suspend operations involving a reduction in primary coolant boron concentration. IMMEDIATELY
    • AND
    • -A.3 Suspend loading irradiated fuel assemblies in the core. IMMEDIATELY
    • AND
    • -A.4 Close all containment penetrations providing direct access from containment atmosphere to outside atmosphere. WITHIN 4 HOURS
  10. What is the interlock for MO-3015/3016, LPSI pump suction valves from the PCS?
    • Prevents opening MO-3015/3016 if PCS pressure is greater than 275 psia (260 psig) as sensed by PS-0104A/B
    • -protects overpressurizing the low pressure injection piping (rated for 300 psig)
    • -will not auto close the valves if pressure goes back above 275 psia
  11. What is the power supply for FIC-0306, CV-3006 SDC flow control valve controller?
    Y-01
  12. What is the setpoint for RV-0401, SDC from PCS relief?
    • 2485 psig
    • -protects the piping between MO-3015 and MO-3016 during a plant heatup/pressurization
    • -relieves to the PSDT
  13. What is the setpoint for RV-3164, SDC suction relief valve?
    • 300 psig
    • -relieves to the quench tank T-73
    • -protects the SDC suction piping
  14. Why must the PCS pressure be maintained <265 psia and PCS temperature <300oF while SDC is in service?
    265 psia maintains your pressure less than the LTOP pretrip alarm
  15. How does CV-3025, SDC temperature control valve, fail on a loss of air/loss of controller and why?
    • Fails closed
    • This is the safety position for containment spray during a CHP
  16. How does CV-3055, inlet to SDC HX, fail on a loss of air?
    Fails as is
  17. How does CV-3006, SDC bypass valve, fail and why for a loss of air/controller?
    • Fails open
    • This is the fail safe position for the LPSI pumps during a SIAS

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