One of the holdings in my spec portfolio is Lightbridge Corporation (LTBR), a U.S. company that is behind revolutionary nuclear power plant fuel rods that utilize thorium to generate power.
The emergency unfolding in Japan right now amongst that country's quake damaged nuclear power plants is basically due to the fuel they use, uranium.
Without getting into the step-by-step specifics of the reaction chain, here's the critical difference to understand about a uranium fuel versus a thorium fuel: the uranium reaction is self-perpetuating (which is why there's so much concern about coolants to prevent a meltdown), but the thorium reaction is not self-sustaining and will fizzle out on its own if it is not deliberately sustained.
My guess here is that come Monday, LTBR shares will experience a panic dump because of today's events. I'm going to keep my eye on it and maybe add to my position.
As always, do your due diligence and make up your own mind about this stock. I'm not making a recommendation about what you should do one way or another.