ELI5: Why hasn't countries started using nuclear power again?

I definitely get the not trusting it part especially when only disasters caused by the plants are so widely viewed and never the positives of the plants. But if countries started to look into making them more safe and reliable these issues would be fixed.

The mining for solar batteries and such is already destroying earth and causing a metric fuck ton of waste (not to mention most of the resources are coming from "third world" countries that are severely unstable).

As for spent fuel a quote from the world nuclear association shows how little wastage is actually made. "The amount of waste produced by the nuclear power industry is small relative to other industrial activities. 97% of the waste produced is classified as low- or intermediate-level waste (LLW or ILW). Such waste has been widely disposed of in near-surface repositories for many years. In France, where fuel is reprocessed, just 0.2% of all radioactive waste by volume is classified as high-level waste (HLW)."

Cost is again the same as removing the stigma around nuclear fuel. The more countries research into it the less of the cost, the easier it will become to manufacture and so on.

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