Five loose bolts discovered on the bottom of a storage tank are believed to be the cause of the leak of 300 tons of radioactive water at the Fukushima No. 1 nuclear power plant, Tokyo Electric Power Co. said Sept. 20.
TEPCO is currently disassembling the leaky storage tank to inspect its interior. The plant operator said the loose bolts were from bottom panels near the eastern edge of the storage tank.
The bolts are designed to be fastened to set an impermeable rubber seal that blocks an opening along a juncture of steel panels. A loose bolt can leave such an opening unblocked. (…)
via TEPCO finds loose bolts on bottom of leaky radioactive water storage tank.