@glasshouse- I took an introduction to physics class and my professor stated that nuclear waste management would see a lot of research and development in the near term. Nuclear waste management is a pressing issue, as most power plants have no way to permanently store their nuclear waste.
Multiple approaches offer opportunities in different research fields. Some scientists are looking for ways to neutralize radioactive material through nuclear digesters (I think that is what they are called). Others are researching repository style waste management techniques. Still others are researching reprocessing waste and more elaborate disposal ideas. The field should be wide open for years to come as there is literally tons of nuclear waste in need of disposal.