Shares of uranium giant (and joint owner of Westinghouse Electric Company) Cameco  (NYSE: CCJ) have been on a tear these past three months, surging by 34% from early July through Friday's close.

On Monday, however, these shares took a breather from their long run upward, and were down by 5.2% as of the close of trading.

So what's worrying Cameco investors? The good news is that there's no bad news -- yet. The bad news is that bad news for nuclear energy stocks could be just around the corner.

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Source Fool.com