March 20, 2013
WASHINGTON — U.S. nuclear power plants must upgrade ventilation systems at 31 reactors with designs similar to those that melted down two years ago in Japan, under a Nuclear Regulatory Commission order that stops short of requiring filtered vents, as some safety advocates and NRC's staff had urged.
The filters are required in Japan and much of Europe, but U.S. utilities say they are unnecessary and expensive.
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