After 70 years of research, LWRs are still the only reactor type that has ever been anywhere near economically viable. Many other approaches, such as Thorium pe

After 70 years of research, LWRs are still the only reactor type that has ever been anywhere near economically viable. Many other approaches, such as Thorium pebble-bed reactors and sodium-cooled fast breeders have been tried and abandoned. It is simply unrealistic that all the issues that have plagued these designs will magically disappear with new ones.