Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of nuclear power expert Babcock & Wilcox (NYSE: BWC) slipped as much as 10% as fears continued to mount over problems at nuclear power sites in Japan.

So what: For those that were hoping for a "nuclear renaissance," the unfolding events in Japan are dimming those hopes considerably. For a company like Babcock & Wilcox -- which specializes in power generation plants, including nuclear sites -- newly stirred-up fears about nuclear power could be a business setback. Of course it wasn't the only stock taking it on the chin over similar concerns as GE (NYSE: GE), Curtiss-Wright (NYSE: CW), and USEC (NYSE: USU) all slid in today's trading.

Now what: As today's trading session wore on, investors appeared to reconsider the concerns over Babcock & Wilcox and, as of this writing, the stock was all the way back to even on the day. There could be some sense that worst-case-scenario fears are overblown or that B&W could capture other business opportunities -- such as nuclear-site assessments or construction of new fossil fuel stations -- as this shakes out.

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