Thanks very much for that question.
Most of the new technology involves much more passive safety features. Today's reactors require some sort of active safety measures in their design. The newer reactors are really designed to be able to walk away from it and not have to worry about decay heat and fuel damage, so they're really much safer. They're designed to be more straightforward to operate. That's the crux of the safety. The fuel is designed to be much more accident resistant. The passive designs are designed to provide cooling through any type of accident.
When you look at it from a safety perspective, that's the basis of “safer”.