This deserves an Oregon ping since Oregon State University did the research on this design by making a 1/4 scale model. Go Beavs. This design utilizes many passive safety systems and relies on the laws of physics and is the safest design on the planet.
Don't get me wrong, I am for it, but isn't what they said about the TMI design as I look at it out my window. Two stacks steaming, two stacks dead forever.
What are some practical design limits for scale size? I always figured that every home by the late 50s should have had one - made by Heathkit, that would provide a welcome heat source for steam boiler and electricity generation. Every 20 years or so, you send in some boxtops and they would send out some new rods or something.