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For some unknown reason, there's still detectable radioactive tritium in one well at the Palisades nuclear plant. Mark Savage, public affairs and communications director for Palisades, told the Van Buren County Board of Commissioners on Tuesday that 13 of its monitoring wells are below the "minimal detectable activity," or MDA, for the substance. But one well still has detectable levels. "All of the 14 wells, save the one, continue to show MDA," Savage said.

Four errors of ``very low safety significance'' were identified by investigators looking into how workers became trapped in a containment area at Palisades Nuclear Power Plant, a government report says. Palisades has been ``taking action to correct'' all of the problems, said Mark Savage, communications manager for the plant, near South Haven. Five workers who were inspecting safety-related piping and components during a plant shutdown were trapped in a high-temperature area for about 90 minutes Aug. 6 when a hatch malfunctioned. They were able to exit when another worker entered.