Browns Ferry SRO Exam: Unit 2 is at 100% rated power with the following conditions: • DRYWELL NOR...

Question

Unit 2 is at 100% rated power with the following conditions:

• DRYWELL NORM OPERATING PRESS HIGH(9-3B W 19) in alarm.

• DRYWELL PRESS APPROACHING SCRAM(9-3B W 30) in alarm.

• DRYWELL PRESSURE ABNORMAL(9-5B W 31) in alarm.

• DRYWELL FD SUMP LEVEL ABN(9-4C W 2) in alarm.

• Drywell venting is in progress using 2-AOI-64-1, "Drywell Pressure and/or Temperature High, or Excessive Leakage into Drywell."

• Drywell pressure is 2.2 psig and steady.

Assuming no further operator action, which ONE of the following describes the plant response if 480V Shutdown Board 2A de-energized due to an electrical fault?

The Drywell vent lineup would be _____(1)_____. Drywell pressure would _____(2)_____.

AnswerChoose the correct answer.Choose all that apply. Correct Partially correct Incorrect Don't Know

  1. A
    Correct Answer

    1) unaffected

    2) lower due to non-essential RBCCW loads isolating.

  2. B
    Correct Answer

    1) unaffected

    2) remain steady at 2.2 psig.

  3. C
    Correct Answer

    1) isolated

    2) lower due to non-essential RBCCW loads isolating.

  4. D
    Correct Answer

    1) isolated

    2) rise due to RPS A de-energizing.

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Published on by U.S. Nuclear Regulatory Commission
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