Monticello SRO/RO Exam: The reactor is at 70% power with a control rod sequence exchange in progr...

Question

The reactor is at 70% power with a control rod sequence exchange in progress. Given the following conditions:

• APRMs 1 and 6 are bypassed.

• Control rod 22-19 is in a high power region of the core.

• Control rod 22-19 is being moved from 00 to 12 using single notch withdrawal.

When the OATC withdrew control rod 22-19 from position 08 to 10 the following occurred:

• Annunciator 5-A-51(RBM HI/INOP) alarmed.

• Annunciator 5-A-3(ROD WITHDRAW BLOCK) alarmed.

• RBM 7 indicated 116% and RBM 8 indicated 114%.

Based on these indications, what action(s) will be needed in order to continue the sequence exchange(Assume the Nuclear Engineer concurs to continue the sequence exchange)?

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

  1. A
    Correct Answer
    Bypass APRMs 2 and 5.
  2. B
    Correct Answer
    De-select and then re-select control rod 22-19.
  3. C
    Correct Answer
    Bypass RBM 7 and continue the sequence exchange.
  4. D
    Correct Answer
    Re-insert rod 22-19 until 5-A-51(RBM HI/INOP) clears.
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Published on by U.S. Nuclear Regulatory Commission
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