Senior Reactor Officer Exam: The plant has scrammed due to a loss of off-site power. HPCS and RCI...

Question

The plant has scrammed due to a loss of off-site power. HPCS and RCIC did not start. When RPV water level reached Level 1, the Control Room Operator reports that the ADS 105-second time delay logic timer is running.

The Unit Supervisor directs the Control Room Operator to inhibit ADS per PEI-B 13, RPV Control (Non-ATWS).

Later the Control Room Operator is directed to arm and depress both Manual Initiation pushbuttons for the ADS 'A' subsystem.

Which one of the following is the response of the ADS 'A' subsystem in this situation?

ADS 'A' subsystem will initiate___________.

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

  1. A
    Correct Answer
    immediately, if any Division 1 low pressure ECCS subsystem pressure permissive is satisfied.
  2. B
    Correct Answer
    in 105 seconds, if any Division 1 low pressure ECCS subsystem pressure permissive is satisfied.
  3. C
    Correct Answer
    immediately, regardless of the Division 1 low pressure ECCS subsystem status.
  4. D
    Correct Answer
    in 105 seconds, regardless of the Division 1 low pressure ECCS subsystem status.
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Published on by U.S. Nuclear Regulatory Commission
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