| 摘要 |
PROBLEM TO BE SOLVED: To speedily conduct internal inspection to a nuclear reactor using a submersible vehicle, and correctly grasp replacement timing for the submersible vehicle. SOLUTION: The submersible vehicle 1 is put in a container 5 having a length longer than an interval between an upper and a lower grid plates, and it is suspended through the upper and the lower grid plates downward to reach a bottom part of a reactor pressure vessel. A rotary detachable arm 33 in the container 5 is driven by an air cylinder 16 to rotate from a position A to a position B, so that the submersible vehicle 1 is speedily positioned to a water range on the other side over a flow baffle 17, thereby the submersible vehicle is directed to a target inspection position for inspection.
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