The practice of releasing pressurized natural gas at a work site is "inherently unsafe" and should be limited to avoid accidents like the recent explosion at a Connecticut power plant, the U.S. Chemical Safety Board determined. The Feb. 7 explosion at the Kleen Energy Systems plant in Connecticut, which killed six people, occurred as workers used natural gas to clean out the pipes. The gas buildup created was big enough to fill a basketball arena, investigators said.

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