Hitachi’s nuclear-waste burning reactor system
Nuclear waste is a problem because it needs to be stored for thousands of years before it is safe. Hitatchi has partnered with MIT, the University of Michigan, and the University of California, Berkeley, to make this situation a little more manageable. They are working on a new reactor design that uses transuranic nuclear waste for fuel; leaving behind only short-lived radioactive elements.
In popular imagination, nuclear waste is a wildly radioactive goo that glows like the back end of a lightning bug. But in real life, the real problem of nuclear waste isn’t the “hot” stuff, but the mildly radioactive elements with atomic numbers greater than 92. That’s because highly radioactive elements have short half lives. That is, they burn themselves out very quickly – sometimes in a matter of minutes or even seconds.
On the other hand, mildly radioactive elements, such as plutonium, have half lives measured in tens of thousands or even millions of years. That makes storing them a very long-term problem, and is a particular difficulty in countries like the United States that don’t recycle transuranium elements by fuel reprocessing or fast-breeder reactors.
What Hitachi and its partners are trying to do is to find ways to design next-generation reactors that can use the low-level transuranium elements as fuel; leaving behind the high-level elements to quickly (relatively speaking) burn themselves out in no more than a century or so.
That’s not a particularly new idea. Some modular nuclear reactors already use nuclear waste as fuel. But what sets Hitachi apart is that it’s looking into designs based on current boiling-water reactors that are known as Resource-renewable Boiling Water Reactors (RBWR) and are being developed by Hitachi and Hitachi GE Nuclear Energy Ltd.
The idea is to develop a new fuel element design using refined nuclear waste products along with uranium that can be installed in a standard boiling water reactor. This would not only make such reactors more economical to build, but would also use decades of safety and operations experience to achieve efficient nuclear fission in transuranium elements.
Hitachi says that it’s already carried out joint research with its partners starting in 2007 and is now concentrating on the next phase, which deals with more accurate analysis methods, as well as reactor safety and performance, with an eye toward practical application of what’s been learned.