Leaking from Non-Welded Tanks in Fukushima Daiichi
They use 350 of big barrel tanks to contain contaminated water in the Fukushima Daiichi nuclear plant.
It has a diameter of 12 meters (37 feet) and a height of 11 meters. But this metal tank consists of four cylindrical parts, each of which is connected to others through rubber packing and bolts but not by welding.
And recently it was found that one of them is clearly leaking radioactively contaminated water. At a small water pool (6 meter wide x 0.5 meter length x 1 cm deep) by the tank, a dosage is so strong that a worker can stay there only for half an hour so as to avoid receiving doses more than an allowable level per year. If he stays near the pool for 30 minutes, he would receive an amount of radiation to which he is legally allowed to be exposed during one-year work. Specifically the level is 80 million becquerels per liter.
