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What: Shares of Babcock & Wilcox (NYSE: BWC) fell more than 14% in early trading after a weekend of trouble with tsunami-ravaged nuclear power plants in Japan.

So what: As if the human tragedy already weren't bad enough, it appears the 8.9 earthquake that birthed the tsunami may also have a market impact. Babcock & Wilcox is a maker of nuclear components, and there have been at least two explosions at the Fukushima nuclear facility operated by Tokyo Electric Power.

Now what: While U.S.-based customers are by far the largest contributors to revenue, Babcock & Wilcox sold $26.9 million worth of equipment in Japan in 2009 and $8.8 million in components last year. Investors may believe the disaster will curtail future sales, not just in Asia but also around the world.

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