Unit 3 Containment Shield Plug Leaking, Possibly Moved

TEPCO investigated the large concrete shield plug in the north east corner of the 1st floor. The plug is partially out of the hatch opening. It is not clear if it was left like this or was moved by the blast. TEPCO cites that the gap between the wall and the plug is not normally there and raised concerns. The track in the floor had been collecting high radiation water and an earlier image showed water on the floor.

TEPCO cites they previously saw the “crevice” at the plug and wished to investigate the flange of the equipment hatch. TEPCO found both dry and wet concrete near the hatch flange and cites they will study the investigation data further.


It is not completely known if the plug was moved by the blast or not as mentioned previously. If the plug was moved by the blast it hints that the force of the blast was down in containment rather than all up in the refueling floor as TEPCO had initially claimed. The findings indicate there is at least some water leakage possibly out the hatch flange. Of note in the image is the robot taking the image. TEPCO does not cite if the robot or workers actually used the scope to take the images inside the hatch. The 2 workers were only in the building 4 minutes. So either they were very quick to do the scope or they could have found a way to add scope capability to the bot. If that is the case that would be another new development to their technology abilities. Right now we do not know what the case is. Doing two excursions back to back as they did with units 2 & 3 is an increased pace from previous months of work by TEPCO at the plant.
TEPCO pdf document on this work at unit 3

November TEPCO pdf document showing the hatch

Many thanks to Steve and Art for working on this!

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