The operator of the stricken Fukushima Daiichi nuclear plant said Saturday that highly radioactive water was leaking from a pit near a reactor into the ocean, which may partially explain the high levels of radioactivity that have been found in seawater off the coast.
Tokyo Electric Power Co. said it had detected an 8-inch crack in the concrete pit holding power cables near reactor No. 2 and was working to seal the fracture. Tepco said the water was coming directly from the reactor and the radiation level was 1,000 millisieverts an hour. The annual limit of radiation exposure allowed for Fukushima workers is 250 millisieverts.
Workers pumped concrete into the shaft Saturday, but by the end of the day, the flow of water into the ocean had not diminished. Engineers speculated that the water was preventing the concrete from setting, allowing it to all be washed away.
Tepco officials said that on Sunday morning they would explore using a polymer -- a type of quick-setting plastic -- in an attempt to plug the leak.
After spraying thousands of tons of water on the reactors at Fukushima over the last three weeks to keep the facility from overheating and releasing dangerous amounts of radiation over a wide area, the utility is faced with the problem of great volumes of contaminated water.
With storage tanks at the facility nearing capacity, Tepco is contemplating storing the water in a giant artificial floating island offshore, Kyodo news reported.
Japan radiation leak: Concrete fails to plug leak at Fukushima nuclear plant - latimes.com
Tokyo Electric Power Co. said it had detected an 8-inch crack in the concrete pit holding power cables near reactor No. 2 and was working to seal the fracture. Tepco said the water was coming directly from the reactor and the radiation level was 1,000 millisieverts an hour. The annual limit of radiation exposure allowed for Fukushima workers is 250 millisieverts.
Workers pumped concrete into the shaft Saturday, but by the end of the day, the flow of water into the ocean had not diminished. Engineers speculated that the water was preventing the concrete from setting, allowing it to all be washed away.
Tepco officials said that on Sunday morning they would explore using a polymer -- a type of quick-setting plastic -- in an attempt to plug the leak.
After spraying thousands of tons of water on the reactors at Fukushima over the last three weeks to keep the facility from overheating and releasing dangerous amounts of radiation over a wide area, the utility is faced with the problem of great volumes of contaminated water.
With storage tanks at the facility nearing capacity, Tepco is contemplating storing the water in a giant artificial floating island offshore, Kyodo news reported.
Japan radiation leak: Concrete fails to plug leak at Fukushima nuclear plant - latimes.com