TEPCO introduced on February 12 that it’ll conduct an inner investigation of the Fukushima unit 2 major containment vessel (PCV) on February 13 to see if deposits noticed on the backside of the Unit 2 pedestal throughout an investigation final yr may be moved by greedy them.
The earlier investigation discovered that pebble and clay-like deposits cowl your entire backside of the pedestal. This was decided by decreasing an commentary machine from the realm above the lacking grating to look at the underside of the pedestal.
This time, the machine, which has been modified with a hand-like greedy machine, will likely be lowered from the identical location to the touch a few of the deposits to find out their movability previous to eradicating them later. Image, dose and temperature knowledge additionally will likely be collected through the investigation.
As earlier than, the investigation will place a precedence on security and environmental safety. Specific measures to be taken will embody utilizing mud displays to verify that gasses from contained in the PCV should not leaking out, establishing a boundary utilizing the sliding a part of the information pipe with double O-rings, and pressurizing the pipe with nitrogen to stop gasoline contained in the PCV from leaking out. An analogous boundary for the sliding a part of the cable additionally will likely be established. (Source: Tepco)
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