energy can be created that will accelerate atoms and molecules into space in such a way that they will never return.
If I had accurate answers to the two questions in the previous post, then I could give a more definitive answer.
The actual amount of thermal energy that is created in nuclear reactions is very small compared to the total amount of energy that is released.
For instance from:
http://en.wikipedia.org/wiki/Decay_chain

Your smoke detector produces 66.8 MeV energy. That is, for every californium atom that converts to thallium atom.
Uranium atom 238 to lead atom 206 = 51.7 MeV
Uranium atom 235 to lead atom 207 = 46.7 MeV

Remember that 165.2 million electron volts of energy is only THREE ATOMS worth, how many of those atoms are in a kilogram of the stuff that is used in the nuclear reactors, and how many kilograms of that stuff is spread in the global environment.
So; yes I believe that it is possible that such a phenomenon can happen.

Australia started mining uranium in 1955 and now exports more than 10,000 tons per year.
I wonder how many MeV's have been released from that operation alone and how it has affected the global environment.

What someone else says about nuclear energy.

http://www.opednews.com/articles/Review-of-The-Film-Pandora-by-Ethan-Indigo-Smith-Chernobyl_Death_ENTROPY_Fukushima-140128-887.html?show=votes

Illegal nuclear waste dumping.

http://gizmodo.com/the-mob-is-secretly-dumping-nuclear-waste-across-italy-1513190243

Other stuff.

http://www.world-nuclear-news.org/NN-Swedish-ship-makes-first-shipment-2801144.html

http://www.world-nuclear-news.org/WR_Sea-route-safe-from-strontium-sources-1411137.html

http://www.bing.com/videos/search?q=nuclear+waste+storage&docid=4654036414301824&mid=9295D2DD9D62ADAB40DE9295D2DD9D62ADAB40DE&view=detail&FORM=VIRE4#view=detail&mid=9295D2DD9D62ADAB40DE9295D2DD9D62ADAB40DE