Tokyo Electric Power, the operator of the stricken nuclear power plant at Fukushima, said Wednesday that it had detected high levels of radioactive strontium in groundwater at the plant, raising concerns that its storage tanks are leaking contaminated water, possibly into the ocean. The operator said it had found strontium-90 at 30 times Japan's safety limit in groundwater near its No. 2 reactor, which suffered a fuel meltdown in 2011. The company has struggled to store growing amounts of contaminated runoff at the plant, but had previously denied that the site's groundwater was highly toxic. If ingested, strontium-90 can linger in bones, emitting radiation inside the body that can lead, in time, to cancer.
Correction: June 19, 2013, Wednesday
This article has been revised to reflect the following correction: The headline with an earlier version of this article misspelled the name of the town that is home to the plant. It is Fukushima, not Fukishima.
This article originally appeared in The New York Times.