Fusion looks to be an expensive dead end, and fission has a terrible accident record. The total cost of ownership for running a nuclear plant is ridiculous. What's really needed is technology to bring down the cost of antimatter, or technology to use smaller amounts of it to disassemble atoms. Using antimatter is much more efficient and doesn't require blasting high energy neutrons everywhere.
The reason the capital cost is so high in the USA for nuclear is due to environmentalits and their endless law suits. The Koreans build new PWR and HWR for capital costs on par with natural gas combined cycle plants but with a fuel cost one tenth as much. Korea has to import all of its energy like Japan. China also has built CANDU and AP1100 reactors on time and on budget why? Neither country tolerates frivolous lawsuits nor criminal boondoggles in construction contractors.
As for accidents you cannot even compare a failed weapons production reactors built with out containment for PU239 production the electricity was just a by product of Chernobyl. Three mile Island released no lasting radiation and it’s containment functioned as designed. Fukashima was a 1960s design operated well after it should have been replaced experiencing a once in a century beyond design point failure chain compounded by human negligence not error tepco was criminally negligent by not pumping seawater immediately into the units. If they would have done that and they had the pumps in hand to do so no melt down but it also would have decommissioned the plants. They thought they could save the income they were unwilling to sacrifice the cores upfront again criminal and once a century. Modern Fen3 reactors cannot fail in the way Chernobyl, nor TMI nor FK Dashi. All of the Gen3&4 are walk away safe format least 72 hours and most have indefinite decay cooling chains so what happened in FK nor TMI can happen again. Antimatter is more of a pipe dream than fusion. Fission works today it’s by FAR the safest energy source on the planet when looking at megawatts produced vs fatalities and medical casualties per 100,000 people. Coal releases 100 times the radiation to the environment than nuclear power every single coal plant does. No dry storage cask has ever failed not a single one. They are so strong you could crash a full fueled 747 into one and let it burn out. Oh btw they did exactly that test on one used a rocket sled to crash into one then burned it for 4 hours till the jet fuel can out. Didn’t even crack it. Crash one head on into a speed locomotive yup did that too. Dropped off a bridge onto rocks yeah been there done that. Waste is a political problem period full stop. Geologists can point to hundreds of places that have 1000 meters of impervious cover and geologically stable basement formations that have been in place BILLONS of years. Wastee that’s unprocessed only needs a million year isolation, processed wastes needs 10,000 years. Both a a blink in geologic time.