Water was found 60cm above the concrete floor of the primary containment vessel. This indicates water is likely flowing out through the torus vent tubes.
The elevation drawing shows where the 60cm of water would be located and it falls just at the lip of the vent tubes. It also shows that water is not staying
in the torus as no water has built up and backed up into the main containment vessel. Water is leaving the torus. Water has to also be leaving the
torus basement, aka: suppression chamber basement.
Other data we have is to try to determine the status of unit 2 is reactor data for the first year of the accident.
Unit 2 radiation data: Drywell “A” sensor was initially very high in March 2011, Mid-April 2011 Torus “B” became very high until late May it drops off.
Unit 2 pressure data: Since the explosion at unit 2 the “core” or RPV pressure and the torus pressure have stayed together at about the same pressure.
Unit 2 core water: Levels have stayed largely the same since the end of March 2011
Unit 2 temperatures: two upward swings between mid-April and June. Early March 2011 data is not available from TEPCO
Fukushima Diary reports worker Happy thinks corium could be in suppression chamber.
These older files were found on early water leaks at unit 2:
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