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SOUTH HAVEN - The same amount of a radioactive substance showed up in another ground water test at the Palisades Nuclear Power Plant that was found on Monday.

Tritium, a radioactive form of hydrogen, was found in a shallow test well December 10. Another sample taken December 13 revealed the same amount of tritium.

The test well is 18 feet deep, and measures only ground water, not drinking water.

The Communications Director for Palisades, Mark Savage, said personnel will begin searching for the cause of the radioactivity.

South Haven Mayor Dorothy Appleyard said she's looking into having the city's water tested for tritium. The city takes its drinking water from Lake Michigan.