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Lobbying Flurry Precedes U.S. Vote on Fukushima Rules

A proposed requirement that U.S. nuclear-power plants add $20 million devices to prevent radiation leaks, one of the costliest recommendations stemming from meltdowns in Japan two years ago, has attracted a flurry of last-minute lobbying.

The U.S. nuclear industry opposes the rule, which would require almost a third of the nation’s reactors to install a special filter on vents designed to prevent an explosive buildup of gases. Exelon Corp., which owns more U.S. reactors than any other company, estimates each filter would cost $20 million, meaning the Chicago-based company could end up paying $220 million to equip its units.