[joshjob42]

Well we know that aqueous homogeneous reactors (AHRs) can be very small; we’ve operated them with < 1 meter diameter cores at powers of >5MWth before. A big plant with 380MWth was estimated to be an approximately 2.5m diameter cylinder and 5m long primary reactor and breeding/shielding blanket, power density ~16kWth/L. https://www.osti.gov/servlets/purl/4123899

Smallest AHRs were ~2 feet or so in diameter and put out ~5kWth, so it’s at least possible that you could deploy them buried in your backyard or something like that.