Hatch Reactor Operator Exam: Unit 2 is Shutdown with the following conditions:  •  Reactor pressu...

Question

Unit 2 is Shutdown with the following conditions:

 •  Reactor pressure is 80 psig and slowly lowering

 •  2D RHR pump is in Shutdown Cooling (SDC)

An event occurs on Unit 2 with the following:

 •  The Supply breaker to 600 V Bus 2D trips and can NOT be re-closed

 • 31EO-EOP-010-2, RC RPV Control (Non ATWS), is in progress

 •  RWL is 5” increasing i per minute (lowest level reached -10”)

Given these conditions, which ONE of the following completes both statements?

 IAW 34AB-R23-001-2, “Loss of 600 Volt Emergency Bus”, energizing 600 VAC bus “2D” using the 4160/600V “2CD” Transformer is_________

 In order to return SDC to service, the Group Isolation Reset switches________ required to be placed in the Gr. 2/5 position.

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

  1. A
    Correct Answer

    NOT allowed;

    are NOT

  2. B
    Correct Answer

    NOT allowed;

    are

  3. C
    Correct Answer

    allowed;

    are NOT

  4. D
    Correct Answer

    allowed;

    are

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Published on by U.S. Nuclear Regulatory Commission
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