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The reason nuclear isn't in favor anymore is mainly due to public sediment and financial reasons.
Everyone thinks nuclear power plants are scary, and they are misinformed. A nuclear power plant releases less radiation per year than a coal plant. But that is besides the point. The main worry is meltdowns. A Chernobyl type accident could never happen again. Chernobyl used a graphite moderator. A moderator in a nuclear power plant speeds up the reaction. A graphite moderator is really bad because once all the cooling water is gone, the reaction will keep happening, leading to a meltdown. Modern reactors use water as a moderator, the same water used for cooling. The thing gets too hot, the water evaporates, and the reaction stops. Also, new reactors include a reinforced concrete containment building that could handle a jet airplane crashing into it. Chernobyl did not have this, so when it melted down, all that radioactive shit went spewing into the air.
Nuclear waste is also handled very safely. Very little nuclear waste is created, and the dangerous stuff is handled very securely, put into massive casks and sealed up so it is safe. It is placed in areas with very low water tables, like deserts, so the waste has no chance of leechigg out. This stuff is no threat to anyone. The vehicles transporting nuclear waste can survive being hit with a train and not leak.
The financial situation is a bit more complicated. Nuclear reactors are very expensive, but their fuel is very cheap. This means over the life of the power plant, nuclear will be more profitable, but it will take a while to recoup the initial investment.
Overall, nuclear power is a financially feasible, carbon neutral, reliable source of energy. It does not have the carbon emission problems of fossil fuels, and it is not intermittent nor does it take up vast tracks of land and damage ecosystems like renewables.
If you'd like to know more about the workings of nuclear power, watch Illinois energy prof on YouTube.
