From Popular Science, an article about science in 2007. Here's their entry on the next generation nuclear reaction design:
This May, however, the Department of Energy will select one of three new designs for a truly next-generation nuclear plant, with the goal of building a commercially viable version by 2021. Each of the
proposed designs would generate temperatures in excess of 1,650°F—hot enough for efficient hydrogen production and, potentially, to ignite a hydrogen economy.