Inspection work inside unit 1’s torus room to check pipe penetrations into the turbine building have been completed. Clay was used as a tracer. This showed some minor leakage between the two buildings. The seals were considered to be mostly intact. Images of the area showed what looked like a silicone material over the pipe penetration. This would be a non-standard way of sealing a pipe penetration. TEPCO and IRID didn’t elaborate on the patch or if it was over the original penetration seal or some sort of replacement.
An effort was also made to have a robot travel the opposite side of the building along the catwalk but ran into a piece of fallen pipe cover. This had already been discovered on previous inspections in late May so it was unclear why this route was repeated. TEPCO did not explain why they didn’t attempt to approach this area from the opposite side since they were already nearly there as they inspected the pipe penetrations.
TEPCO placed an inflatable plug in the hatch opening at unit 1. The plug is part of the preparation to remove the tent from unit 1 so a more permanent building can be installed after debris is removed. TEPCO didn’t explain exactly how they installed the inflatable plug.
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