http://rt.com/news/fukushima-radiation-water-leak-186/
In one of those cases in October 2012, Uechi was given a task to cover five or six storage tanks without lids in the “E” area close to H3 as it was raining, the Japanese paper reported. When he climbed to the top of the 10-meter-high tank Uechi found white adhesive tape covering an opening of about 30 centimeters. After using a blade to remove the tape he applied a sealing agent on the opening and fit a steel lid fastening it with bolts. According to instructions he was to use four bolts, though the lid had eight bolt holes.
According to the employee, his colleagues later told him that the use of adhesive tape was a usual practice to deal with the problem of sealing in radioactive water.
“I couldn’t believe that such slipshod work was being done, even if it was part of stopgap measures,” Uechi told The Asahi Shimbun.
Among other makeshift cost-cutting measures was the use of second-hand materials. Uechi also said that wire nets were used instead of reinforcing bars during the placement of concrete for storage tank foundations. In addition, waterproof sheets were applied along the joints inside flange-type cylindrical tanks to save on the sealing agent used to join metal sheets of the storage tanks. Rain and snow had washed away the anti-corrosive agent applied around clamping bolts, reducing the sealing effect, Uechi added. According to the Fukushima worker, many of the tanks were later found to be leaking contaminated water.