Fair dinkum. Still, it would be useful to know; after all, it doesn't really matter that it won't contaminate everything if it ends up contaminating you.
I guess I bought most of the nuclear hype in the 1950s and because I was a child. The scales were later pried from my eyes.
Regarding the safety of pebble bed reactors, I'll stay open to argument but the process of the linked article does look to be about as safe as is gets. No power plant is safe under catastrophic conditions and the car I drive is a potential IED so absolute safety is just not to be had.