TEPCO released information about the interim plan for cleaning off the refueling floor of unit 1. One of the major problems with unit 1 is the concrete and asphalt roof slab that fell on top of the refueling floor during the hydrogen explosion. This is creating some challenges for determining the state of the debris beneath it.
The existing refueling floor steel wall framework is slated to be removed starting in November 2015. Repeated scans of the area above the roof slab to determine debris and dust particle size is currently underway. Similar scans were done in previous years. This will eventually include probing sideways from the east side of the building into the debris below the roof slab. That will enable TEPCO to determine the make up of the dust and small debris pieces along with determining the levels of radiation and isotope composition.
Earlier work in 2014 discovered the concrete reactor well cover to be dislodged on the side near the spent fuel pool. This previous work originally hoped to begin removing the building cover in December of 2014, they are only now moving ahead with that work. Radiation readings have been only taken above the roof slab, along with dust sampling of the air from the same location. Some radiation readings were taken in the machine hatch in 2012 as they used a balloon to send a video camera up to the refueling floor. If TEPCO has managed to take more detailed radiation readings beneath the collapsed roof slab, they have not made them public.
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