TEPCO announced a plan that should enable them to look inside unit 2 and inspect the reactor vessel directly. TEPCO plans to use the long scope camera to conduct the work. They will send the scope down the control rod replacement rail into the pedestal, this will allow a clear view of the underside of the steel reactor vessel. Since the bottom of this vessel is the likely melt through location this work may give some major clues to what happened at unit 2.
From the handout it appears they practiced the work at unit 5. This is a common tactic TEPCO has used to allow workers to be familiar with the task before going into the high radiation environment in the other units.
This work will be done in late March, if all goes right we should have a visual of the underside of the reactor vessel and also a water sample for TEPCO to analyze. The water sample will help understand how injected water is moving through the system inside the reactor and containment.
TEPCO Handout: Unit 2 CRD Scope handouts_130301_02-e
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