Dangerous radiation leaked from three-quarters of U.S. nuclear power plants

Dangerous radiation has leaked from three-quarters of all U.S. nuclear power stations raising fears the country's water supplies could one day be contaminated.

The number and severity of leaks has increased because of the many old and unsafe plants across America, a new investigation has claimed. 

Radioactive tritium has escaped at least 48 of 65 of all U.S. sites, often entering water around the plants through rusty old pipes.

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