Nuclear security

Radioactive material found in groundwater below nuke plant

An apparent overflow at a nuclear power plant north of New York City spilled highly radioactive water into an underground monitoring well, but nuclear regulators said the public isn't at risk.

Officials at the Indian Point Energy Center in Buchanan, 40 miles north of Manhattan, reported on Friday that water contaminated by tritium leaked into the groundwater under the facility. The contamination has remained contained to the site, said Democratic Gov. Andrew Cuomo, who ordered the state's environmental conservation and health departments to investigate.

"Our first concern is for the health and safety of the residents close to the facility and ensuring the groundwater leak does not pose a threat," Cuomo said Saturday in a statement.

The leak occurred after a drain overflowed during a maintenance exercise while workers were transferring water, which has high levels of radioactive contamination, said Neil Sheehan, a spokesman for the Nuclear Regulatory Commission. Normally, a sump pump would take the water and filter it into another treatment system, but the pump apparently was out of service, Sheehan said. After the drain overflowed, the water seeped out of the building into the groundwater.