Fukushima Daiichi Unit 2 Prepares For Containment Inspection
A newly released document shows progress in the effort to inspect inside unit 2’s containment. At unit 1 they went directly to installing a shape changing robot to inspect inside containment in two directions. With unit 2 there are more problems to overcome.
For unit 2 this initial attempt will be to run a different crawler bot down the CRD rail. If it is successful they hope to obtain images from inside the reactor pedestal. In order to do this they will need to open the X6 control rod hatch. In preparation for that, shielding blocks have been installed around the area. A packbot robot has also been used to estimate the radiation levels at the control rod hatch.
CRD hatch Radiation readings at the CRD hatch, higher readings taken closer to the hatch.
The radiation levels near the hatch are over 1 sievert. This is too high for humans to approach and can damage robots if left in the area too long.
The plan is currently to begin the effort to insert the robot in early July.
**UPDATE** Toshiba clarified on 6.30.2015 that training will begin mid July. Insertion into unit 2’s containment will be late August
TEPCO handout http://www.tepco.co.jp/nu/fukushima-np/handouts/2015/images/handouts_150629_05-j.pdf
TEPCO handout rough machine translation:
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