Two and a half years after the Fukushima No. 1 nuclear plant experienced its three reactor-core meltdowns, the effort to clean up what remains of the complex is turning into another kind of disaster.

The site now stores some 340 million liters of radioactive water, more than enough to fill Yankee Stadium to the brim. An additional 400 tons of toxic groundwater is flowing daily into the Pacific Ocean, and almost every week Tokyo Electric Power Co. acknowledges a new leak.

Tepco started the cleanup process more than two years ago and was subsequently given a government bailout as its debts soared. The job of dismantling the facility was supposed to give the company an opportunity to rebuild its credibility.