TEPCO announced a number of new leaks over the weekend. Tritium levels were going up including in the port. TEPCO also announced they began a plan in April to add another metal sea wall in front of the first one to try to stem the leaking.
TEPCO sent workers into unit 2 again to do more investigative work in the TIPS room. The original hope was to find an open TIPS probe pipe to send sensors and a camera into the pedestal below the reactor vessel. Earlier attempts found blockage in the pipes. This attempt again found blockage but brought out a sample of a dark grey substance. TEPCO cites the radiation level of the small bit of debris to be 200 mSv/hour but this is only y-rays and beta radiation. This does not include gamma radiation.
TEPCO also tested two pieces of debris found in Nahara. It was suspected the items came from the explosions at Fukushima Daiichi. The government requested TEPCO test the items. The small 2cm by 2cm piece had 12,000 μSv/h (12 mSv/h) of y-rays and beta only (no gamma reading given). The larger item that appears to be a piece of wood read at 4,700 μSv/h of y-rays and beta only. TEPCO gave no further analysis of the items and did not discuss the possibility of them being from the explosions.
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