down 1/2 a dollar, page-6

I'm only guessing, but a bit of negative nuclear sentiment (picked by local media) was generated by ...

http://www.nytimes.com/gwire/2009/04/22/22greenwire-no-need-to-build-new-us-coal-or-nuclear-plants-10630.html

The FERC chairman's comments go beyond those of other Obama administration officials, who have strongly endorsed greater efficiency and renewables deployment but also say nuclear and fossil energies will continue playing a major role.
Wellinghoff's view also goes beyond the consensus outlook in the electric power industry about future sources of electricity.

I reckon it will bounce back pretty quickly.