DC

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Author:
heidin
ID:
156289
Filename:
DC
Updated:
2012-05-29 11:58:17
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DC Distribution ILC
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  1. Which one of the following is the power supply to the Outboard MSIV's DC solenoids on Unit One?


    A. Div 1 Switchboard 21A.
    B. Div 2 Switchboard 22B.
    C. Div 1 Switchboard 1A.
    D. Div 2 Switchboard 1B.
    D. Div 2 Switchboard 1B.
  2. The 250V Batt B Ground alarm is received and sealed in on Unit Two. The following readings are taken:

    2B-l 135 VDC (in float)
    28·2 135 VDC (in float)
    N bus 3.5ma
    P/N bus 2.4ma
    P bus 1.2 ma

    Where is the ground located, and what action level of AI·115 is applicable?

    A. P bus. AI·115 action level 1 applies.
    B. P bus. AI-115 action level 2 applies.
    C. N bus. AI-115 action level 1 applies.
    D. N bus. AI-115 action revel 2 applies.
    B. P bus. AI-115 action level 2 applies.


    Ground calculation per OP·51 shows ground of approx 7.5 kohms. This is below the value for action level 2 per AI-115. Since high reading is on the N Bus, the P bus is grounded. PIN reading is taken per procedure but should not be used or wrong value will be calculated (Le. if P and PIN readings are used, action level 1 applies).
  3. During normal full power operation of Unit Two, the following alarms are received indicating loss of DC power:

    UA-09 2-5
    UA-13 4-1, 5-10, 6-2, 6-10
    A-01 1-6, 2-5, 2-B, 5-5, 6-4
    A-02 4-4
    A-03 1-3, 2-2
    A-04 1-8, 5-1
    A-05 1-7, 2-6, 3-6, 5-3, 5-6
    A-06 1-6, 5-6, 5-8

    Which 125 VDC distribution system has been lost?

    A. 2A-1.
    B. 2A-2.
    C. 2B-1.
    D. 2B-2.
    A. 2A-1.


    Per Attachment 1 of AOP-39.0 it can be determined that DC panels 4A, 6A and 12A have been lost. Per Figure 2, these panels are powered from the 2A·1 portion of the 125/250 VDC Division I system.
  4. Initial Plant Conditions are as follows:

    Unit Two (2) is at 385 RTP
    Recirc Pump Speeds are matched at 45%
    DC Panel 12A is deenergized.

    If an ATWS were to occur, with no other equipment failures, what action can the operator take that will immediately mitigate the event?

    A. Reduce Load Set
    B. Manually initiate ARI
    C. Trip the Main Turbine
    D. Reduce Recirc Pump Speed
    D. Reduce Recirc Pump Speed


    AOP-39; 0OI-50
  5. The Unit 2 Division II 125/250 VDC distribution system has lost the 2B-1 Battery and the 2B-2 Charger.

    What is the immediate affect on the Division II 125 VDC loads?

    A. None of the Division II 125 VDC loads are lost.
    B. Only the 125 VDC loads associated with 2B-1 are lost.
    C. Only the 125 VDC loads associated with 2B-2 are lost.
    D. All 125 VDC loads associated with 2B-1 and 2B-2 are lost.
    A. None of the Division II 125 VDC loads are lost.
  6. Following the receipt of a ground alarm on the 2B 250VDC Battery Switchboard, the Auxiliary Operator reports the following ground current readings.

    P = 1.9
    P/N = .02
    N = 2.1

    The 2B-1 and 2B-2 chargers are in EQUALIZE. Each battery charger has an output voltage of 140 VDC.

    Which bus is grounded and what is the total resistance to ground?

    A. P/N bus is grounded. Total resistance to ground is 20 Ώ.
    B. P/N bus is grounded. Total resistance to ground is 70 Ώ.
    C. P is grounded. Total resistance to ground is 70 Ώ.
    D. N is grounded. Total resistance to ground is 20 Ώ.
    A. P/N bus is grounded. Total resistance to ground is 20 Ώ.
  7. Which of the following DC loads will automatically transfer to an alternate power supply in the event of a loss of DC Switchboard 2B?

    A. H58 ESS Logic Cabinet
    B. Emergency 4KV switchgear E4 control power
    C. Automatic Depressurization System valve power
    D. Emergency Diesel Generator #4 start and load circuit
    C. Automatic Depressurization System valve power
  8. What effect does a loss of 125 VDC distribution panel 4A have on the Unit Two (2) P601 and P-603 panel annunciators?


    A. Normal power is lost to P601 and P603 annunciators. “ANNUN POWER FAILURE” alarms.
    B. Normal power is lost to P601, and alternate power is lost to P603 annunciators. “ANNUN POWER FAILURE” alarms.
    C. Normal power is lost to P601 and P603 annunciators. “ANNUN POWER FAILURE” alarms, but panel 12A provides alternate power to the annunciator cabinets for P601 and P603.
    D. Alternate power is lost to P601 and P603 annunciators. “ANNUN POWER FAILURE” and “RHR HX AREA AMB TEMP HI” alarm.
    A. Normal power is lost to P601 and P603 annunciators. “ANNUN POWER FAILURE” alarms.

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