[philipkglass]

It's also due to technical and economic reasons. Tiny reactors require highly enriched fuel and have worse neutron economy and thermal efficiency. You can't use the same low-enriched fuel in a tiny reactor that you can in a typical (hundreds of megawatts or larger) commercial power reactor.

In a big commercial power reactor, fuel costs are tiny relative to the total system costs. If you used a tiny reactor like the Kilopower [1] to power a single home, the cost of the highly enriched fuel alone (upward of $50,000 per kilogram, 28 kg in a unit) would be orders of magnitude more expensive than grid-supplied electricity.

[1] https://en.wikipedia.org/wiki/Kilopower