Several projects are currently underway to create safe, sealed, portable nuclear reactors that can provide megawatts of electric power for decades without the need for refueling.
The Japanese Super Safe, Small and Simple, or 4S, is a sealed reactor designed by Toshiba that is slated to be used first in 2012 in Galena, a remote town on the Yukon river in Alaska. It will provide 10MW for 30 years. Here is a fairly detailed report on the project.
Another is the Small Secure Transportable Autonomous Reactor, or SSTAR designed by researchers at Lawrence Livermore National Laboratory (LLNL) in California. It will provide 30MW for 30 years and be similarly sealed and require no refueling. It will also be contained in a tamper-proof “flask” that will use a secure satellite link to report any attempt at interference with its operation. Here is a very detailed staus report on this project.
Persoanlly I’m still waiting for the nuclear power sources Asimov wrote about in his Foundation Trilogy all those years ago that you could wear on your belt. One of those things like the flying car that never quite made it from the promises of 60s SF into real life.