TEPCO has found polluted water leaking from concentrated salt water storage tank for the purification of contaminated water of the Fukushima Daiichi nuclear station and announced that high beta radiation levels were detected over 2,000 millisieverts per hour at the bottom of the tank.
TEPCO believes the root cause was loose bolts in the tank seam. TEPCO re-tightened the bolts to stop the leak, and have established an acrylic plate to shield radiation.
Tank that occurred leakage (pictured on February 3, 2012)
After additional clenching, it stoped to leak (pictured on February 3, 2012)
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