Thorium reactors or pebble bed reactors might be options. The only reason we have the current designs is due to the us navies need to build a reactor that would

Thorium reactors or pebble bed reactors might be options. The only reason we have the current designs is due to the us navies need to build a reactor that would fit on submarines and ships. That technology became the basis for our deployed reactors. Since then nothing else has been tried outside of small experimental plants from what I understand.