Personally, I'd build a few GenIV reactors.
Amen to that. Some pebble bed designs are "walk-away" safe. And there's others too. I can't even imagine where we'd be if fission technology had serious commercial competition for safety design and efficiency.
And also, you can make reactors with Thorium too. We've just been standardized on Uranium ever since WWII because the first full-blown nuclear reactor projects were going hand in hand with bomb projects, and the greater technical hurdle that while Thorium can fission, it can never reach critical mass. It was much harder to create a steady neutron source back then.
Now you could make a Thorium reactor with a neutron particle beam initiator, and if anything "breaks" it just shuts off and stops fissioning because it can't sustain a reaction without the seed neutrons.
What's even cooler than that, because of the unique nature of a Thorium reactor's fuel cycle and the intermediate isotopes it makes as it fissions, it can "burn" Uranium/Plutonium waste from the Uranium reactor economy, and the resulting waste is only "bad" for 500 years or so, as opposed to 10,000 years. And the Thorium cycle is useles in regards to bomb and proliferation concerns. We can "give" Thorium reactors to the third-world willy-nilly and not have to worry. And if they're incompetent or "break" the reactor, the reaction stops, instead of getting beyond their control.