Preferred AC/DC

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skrappie1
ID:
136729
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Preferred AC/DC
Updated:
2015-10-30 13:40:21
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Preferred AC DC advanced systems
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Preferred AC/DC
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  1. Does an alarm have to be received to find a DC ground?
    • No, DC grounds could be identified by NPO via:
    • 1. DC bus Strip Chart (1 or 2)
    • 2. D11A or D21A ground detector light on
    • 3. current recorder indicator deflected to one side short of making contact. CR alarm (from milli-amp meter) doesn't come in.
    • Max possible reading on milli-amp meter is 4.3 ma due to resistors. (Grounds as low as 10 volts can be found)
  2. What is the design basis for the Station Batteries?
    • (1) The station batteries must supply the required emergency loads for 4 hours until offsite or onsite power is restored.
    • (a) Extending the station battery duty cycle may be accomplished by utilizing EOP Supplement 7 or 8 to perform selective manual stripping of loads not required during Station Blackout.
    • (2) In the event of a cable spreading room fire, to provide 72 hours of unsupported DC power, required to achieve plant cold shutdown (via D11A/D21A loads)
  3. How long does it take for the Y-50 ABT to transfer to its alternate source? When will it transfer back to the normal source?
    • (1) The ABT transfers from the normal supply (MCC‑1) to the emergency supply (MCC-2) in less than 1 second.
    • (2) If power is restored to MCC-1 the ABT will auto switch back to the normal power supply in approximately 5 minutes
  4. LCO 3.8.4 DC Sources - Operating
    • LCO 3.8.4 The Left Train and Right Train DC electrical power sources shall be OPERABLE
    • APPLICABILITY: Modes 1, 2, 3, and 4
    • LCO 3.8.4.A – One required DC electrical power source battery charger inoperable
    • (1) A.1, Verify functional cross-connected battery charger is connected supplying power to the affected DC train within 2 hours AND
    • (2) A.2, Restore required DC electrical power source battery charger to OPERABLE staus within 7 days
    • LCO 3.8.4.B – One required DC electrical power source battery inoperable
    • B.1, Verify OPERABLE directly connected and functional cross-connected battery chargers are connected supplying power to the affected train within 2 hours AND
    • (2) Restore required DC electrical power source battery to OPERABLE status within 24 hours.
  5. T.S. 3.8.5 DC Sources – Shutdown
    • LCO 3.8.5 DC electrical source(s) shall be OPERABLE to support the DC electrical power distribution subsystem(s) required by LCO 3.8.10, “Distribution Systems – Shutdown.”
    • APPLICABILITY: Modes 5 and 6, During movement of irradiated fuel assemblies
    • LCO 3.8.5.A –One or more required DC electrical power sources inoperable
    • (1) A.1 Declare affected required feature(s) inoperable Immediately OR
    • (2) A.2.1 Suspend CORE ALTERATIONS Immediately AND
    • (3) A.2.2 Suspend movement of irradiated fuel assemblies Immediately AND
    • (4) A.2.3 Initiate action to suspend operations involving positive reactivity additions Immediately AND
    • (5) A.2.4 Initiate action to restore required DC electrical power source(s) to OPERABLE status Immediately
  6. T.S. 3.8.6 Battery Cell Parameters
    • LCO 3.8.6 Battery cell parameters for the Left Train and Right Train batteries shall be within limits
    • APPLICABILITY: When associated DC electrical power source(s) are required to be OPERABLE
    • NOTE: Separate Condition entry is allowed for each battery
    • LCO 3.8.6.A – One or more batteries with one or more battery cell parameters not within Category A or B limits
    • (1) A.1 Verify pilot cells electrolyte level and float voltage meet Table 3.8.6-1 Category C limits within 1 hour AND
    • (2) A.2 Verify battery cell parameters meet Table 3.8.6-1 Category C limits within 24 hours AND once per 7 days thereafter AND
    • (3) A.3 Restore battery cell parameters to Category A and B limits of Table 3.8.6-1 within 31 days
    • LCO 3.8.6.B-Required Action and associated Completion Time of Condition A not met -Declare associated battery inoperable Immediately
    • OR
    • One or more batteries with average electrolyte temperature of the representative cells < 70F.-Declare associated battery inoperable Immediately
    • OR
    • One or more batteries with one or more battery cell parameters not within Category C limits. Declare associated battery inoperable Immediately
  7. Why is the battery room temperature an operator concern?
    SR 3.8.6.2 requires the average electrolyte temperature to be greater than or equal to 70°F. Battery room temperature has an effect on electrolyte temperature. If temperature is less than 70oF Tech Spec Action 3.8.6B is entered. 3.8.4B might also be entered if in Mode 1 thru 4.
  8. T.S. 3.8.7 Inverters – Operating
    • LCO 3.8.7 Four inverters shall be OPERABLE
    • APPLICABILITY: Modes 1, 2, 3, and 4
    • LCO 3.8.7.A – One inverter inoperable, restore inverter to OPERABLE status within 24 hours.
    • Note: Enter LCO 3.8.9 with any preferred AC bus de-energized
  9. T.S.3.8.8 Inverters – Shutdown
    • LCO 3.8.8 Inverter(s) shall be OPERABLE to support the onsite Class 1E Preferred AC bus electrical power distribution subsystem(s) required by LCO 3.8.10, “Distribution Systems – Shutdown.”
    • APPLICABILITY: Modes 5 and 6, During movement of irradiated fuel assemblies.
    • LCO 3.8.8.A – One or more required inverters inoperable
    • (1) A.1 Declare affected required feature(s) inoperable Immediately OR
    • (2) A.2.1 Suspend CORE ALTERATIONS Immediately AND
    • (3) A.2.2 Suspend movement of irradiated fuel assemblies Immediately AND
    • (4) A.2.3 Initiate action to suspend operations involving reactivity additions Immediately AND
    • (5) A.2.4 Initiate action to restore required inverters to OPERABLE status Immediately
  10. T.S. 3.8.9 Distribution Systems – Operating
    • LCO 3.8.9 Left Train and Right Train AC, DC, and Preferred AC bus electrical power distribution subsystems shall be OPERABLE
    • APPLICABILITY: Modes 1, 2, 3, and 4
    • LCO 3.8.9.A – One or more AC electrical power distribution subsystems in one train inoperable
    • (1) A.1 Restore AC electrical power distribution subsystem(s) to OPERABLE status within 8 hours AND 16 hours from discovery of failure to meet LCO
    • LCO 3.8.9.B - One preferred AC bus inoperable
    • (1) B.1 Restore Preferred AC bus to OPERABLE status within 8 hours AND 16 hours from discovery of failure to meet LCO
    • LCO 3.8.9.C – One or more DC electrical power distribution subsystems in one train inoperable
    • (1) C.1 Restore DC electrical power distribution subsystem(s) to OPERABLE status within 8 hours AND 16 hours from discovery of failure to meet LCO
    • LCO 3.8.9.E – Two or more inoperable distribution subsystems that result in a loss of function
    • (1) E.1 Enter LCO 3.0.3 Immediately
  11. T.S. 3.8.10 Distribution Systems – Shutdown
    • LCO 3.8.10 The necessary portion of AC, DC, and Preferred AC bus electrical power distribution subsystems shall be OPERABLE to support equipment required to be OPERABLE
    • APPLICABILITY: Modes 5 and 6, During movement of irradiated fuel assemblies.
    • LCO 3.8.10.A – One or more required AC, DC, or Preferred AC bus electrical power distribution subsystems inoperable
    • (1) A.1 Declare associated supported required feature(s) inoperable Immediately OR
    • (2) A.2.1 Suspend CORE ALTERATIONS Immediately AND
    • (3) A.2.2 Suspend movement of irradiated fuel assemblies Immediately AND
    • (4) A.2.3 Initiate action to suspend operations involving positive reactivity additions Immediately AND
    • (5) A.2.4 Initiate actions to restore AC, DC, and Preferred AC bus electrical power distribution subsystems to OPERABLE status Immediately AND
    • (6) A.2.5 Declare associated required shutdown cooling train inoperable and not in operation Immediately
  12. The plant is in Mode 6 with refueling operations in progress when Preferred AC Bus Y10 becomes de-energized due to a failure of its Inverter ED06. Which of the following evolutions must be suspended immediately?

    A) Crane operations on 590’ elevation in Containment.
    B) Refueling Handling Machine wet checks in the Reactor Cavity.
    C) Spool piece installation for draining the South Tilt Pit.
    D) Handling tool washdown over the Reactor Cavity.
    C) Spool piece installation for draining the South Tilt Pit
    (this multiple choice question has been scrambled)
  13. What would the impact be on 125V DC system of use of the shunt push button?
    Battery discharge, loss of AC would result in loss of DC bus.
  14. When would you use the shunt trip button?
    Fire in cable spreading room or when directed by AOP OR EOP.
  15. What effect will disconnecting Station Battery #1 and D11A have on the overall Electrical Distribution System?
    Potential loss of DC Bus 1 on loss of AC power.
  16. What is the effect of loss of all DC power on the 4160 and 2400 VAC System?
    • Loss of bus control power
    • Loss of fast transfer capabilities
    • Loss of bus main generator and transformer protective circuits
    • NOTE: 386 P, B and C will not operate, therefore no main generator protection and no generator coast-down.
  17. What is the effect on the emergency Diesel Generator System due to a loss of DC Bus 11A?
    Loss of control power to Diesel Generator 1-1 and Loss of Bus 1C control power. Incoming breakers
  18. What is powered from D-10L?
    • Y-30
    • P-81A PCP bearing oil lift pump
    • P-81C PCP bearing oil lift pump
  19. What is powered from D-10R?
    • D-11-1
    • D-11-2
    • Y-10
    • Plant PA system
  20. What is powered from D-20R?
    • Turbine building emergency lighting
    • Aux building emergency lighting
    • Y-20
    • D-21-1
    • D-21-2
  21. What is powered from D-20L?
    • P-81D PCP bearing oil lift pump
    • P-81B PCP bearing oil lift pump
    • Y-40
  22. What is lost when you lose power to D-11-A?
    • D/G 1-1
    • -Lose ability to start, control, and load
    • D/G 1-1.
    • Bus 1C
    • -Lose control power for all incoming
    • breakers to Bus 1C.
    • -Loss of Load Shed for Bus 1C
    • breakers.
    • -Lose control power for all feeder
    • breakers from Bus 1C.
    • LCC-11 Breakers
    • -breakers won't loadshed
    • LCC-13
    • -lose control power for all breakers
    • LCC-14
    • -lose control power for all breakers
    • 72-01, Isolation Breaker to DC Battery No. 1 ED-1
    • -Lose ability to remotely open 72-01 from Panel D11A.
    • EC-150, Auxiliary Hot Shutdown Panel
    • -Lose instruments and control at EC-150.
    • EC-150A, Auxiliary Hot Shutdown Monitoring Panel
    • -Lose instruments at EC-150A.
    • Control Room HVAC (V-95 Train)
    • -Loss of control for V-95 Train.
  23. What is lost when you lose power to D-21-A?
    • Lose ability to start, control, and load
    • D/G 1-2.
    • Lose control power for Bus 1D incoming
    • breakers and feeder breakers.
    • Loss of Load Shed for Bus 1D breakers.
    • Bus 12 breakers won't Load Shed.
    • 72-02, Isolation Breaker to DC Battery No. 2 ED-02.
    • -Lose ability to remotely open breaker 72-02 from Panel D21-A
    • Loss of control for CRHVAC V-96 Train.
    • PZR Heater Breaker 152-211 will not trip
    • on low PZR level.

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