TEPCO sent the small 3D printed robot equipped with a smart phone into inspect the unit 3 containment hatch a second time. Video from the robot along with video taken by a scope inserted into the space near the hatch provided a good view of the conditions in this area. It did not include radiation readings. The robot was controlled via a group of WIFI repeaters.
The robot found considerable corrosion along the connection of the hatch door to the containment wall. This area has been where highly radioactive water had leaked out into the hallway. TEPCO did not give any analysis of the new data but this area would obviously need to be sealed if they decide to go forward with plans to flood containment.
** Update** This more detailed TEPCO handout on the work gives much more detail. It also includes a mention that the highest radiation level found was 1.2 Sieverts/hour.
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