http://www.gazettenet.com/2011/06/21/vt-reactor-continues-tritium-cleanupTuesday, June 21, 2011
AP Photo The Vermont Yankee nuclear power plant on the banks of the Connecticut River in Vernon, Vt., is seen in April.
The Vermont Yankee nuclear power plant continues to monitor groundwater for tritium after the radioactive isotope was discovered in high amounts in a test well on its property near the Connecticut River last year.
The leak was followed by a series of other positive readings for tritium and other radioactive substances on the plant's grounds. The most recent tritium leak was reported in a test well in January and its source is not definitely known, though the plant took a discharge line out of service as a result.
"They haven't fully been able to demonstrate cause and effect," said Neil Sheehan, a spokesman for the U.S. Nuclear Regulatory Commission
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The Vermont Senate was so troubled by tritium leaks - as high as 2.5 million picocuries per liter at the reactor, or 125 times the EPA drinking-water standard - that it voted to block relicensing. The Senate vote also followed admissions by the plant that it misled Vermont regulators and lawmakers about whether the plant had the kind of underground piping that carries radioactive material. In March, the NRC granted the plant its 20-year license extension, despite state opposition. Weeks ago, Entergy sued Vermont in federal court, challenging its authority to force the plant to close. The plant's permit expires in March 2012.
Tritium is a radioactive isotope of hydrogen and a product of nuclear fission. It is a carcinogen when ingested, inhaled or absorbed in large amounts.