Two newer underwater robots are being used to inspect the torus rooms of units 1 and 2. The robots built by Hitachi/GE are dropped into the torus room in the basement of the reactor buildings through holes cut in the first floor of the buildings. Slightly different locations for the drop hole were used in the two reactor buildings, possibly due to local radiation levels or differences in building design.
The swimming robot is equipped with cameras to visually inspect the structures while the underwater floor crawler can take ultrasound images to give additional data on pipes and water leaks. Both robots were already used to inspect the outer wall pipe penetrations that connect to the turbine building in unit 1. Minor leakage was found at that location. Obviously additional images were obtained but TEPCO & Hitachi/GE have been reluctant to make those videos public.
Work to do similar pipe investigation work in unit 2 won’t begin until July. Work is currently underway to prepare and cut the hole in the first floor of the building. There is currently no similar work scheduled for unit 3.
TEPCO handout in Japanese:
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