North Anna RO Exam: Given the following plant conditions: • The team is responding to a loss of b...

Question

Given the following plant conditions:

• The team is responding to a loss of both emergency busses.

• Neither bus could be re-energized and all emergency bus-powered equipment was placed in PULL-TO-LOCK.

• S/G depressurization resulted in automatic actuation of safety injection.

Which ONE of the following explains why the team is directed to reset the SI signal?

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

  1. A
    Correct Answer
    Allows the team to reset containment phase "A" isolation when directed.
  2. B
    Correct Answer
    Prevents thermal shock to RCP seals due to uncontrolled restoration of seal cooling.
  3. C
    Correct Answer
    Blocks automatic SI when PRZR low-low pressure occurs during cooldown.
  4. D
    Correct Answer
    Prevents equipment from auto-starting when it is removed from PULL-TO-LOCK.
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Published on by U.S. Nuclear Regulatory Commission
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