Why not Thorium. From my understanding it processes (re-processes) itself into something rather harmless.
Tech doesn't exist yet. Well, it does but not in practical terms. There's also other disadvantages of using liquid fluoride thorium reactors.
You need to jumpstart thorium with fissile material (ie uranium) for initial start up. I understand that running thorium reactors can jumpstart other thorium reactors but not sure of the engineering involved.
Fluoride salt mixtures melt at around 600F or higher, depending on type. That's substantially above room temperature. So your coolant is solid at room temperature, which is more fun engineering.
There's proliferation concerns.
The coolant is toxic as hell. Beryllium poisoning is no joke. Alternatives exist, but again, more engineering required. Either way, you need an on-site chemical plant. Plus there are circumstances where fluoride loses its gentle and forgiving nature to become probably the most horrific stuff on the planet. Fluorine is poisonous to humans but fluoride is not.
Speaking of toxic, you want to store the fuel at above a 100C or you can risk fluorine gas and uranium hexafluoride.
That's great but... your ideas also only work in a sane world. My idea of 4 competing designs (there, we have a specific number) with updates/redesigns happening after a set number of years (I'll pick 20), has just as much chance of implementation as your own.
Which is, of course, zero.
Well, mine is based on France's real world. But yes, zero here in US.
Telling people what designs they can use doesn't sound like free market to me. I am sure there is some way to incentivize that, but do you want a govt run nuke industry?
As far as I'm aware, there is no public utility in the US that is free market? I'm not familiar with any free market public utility in the entire world, actually, but I'm sure one exists... somewhere. Every single public utility uses government property and authority to exist. They ride on the back on government infrastructure (mostly roads, but also spectrum, easements, mandatory use, etc) in order to exist.