Putin plans to disconnect the Zaporizhzhia nuclear plant from Ukraine's power grid. This would create the risk of reactor meltdowns if anything goes wrong with local electric generation, because keeping the reactor cores cool requires electricity.

One can see, from this, that the existence of a nuclear reactor creates a risk whenever anything else goes wrong. Earthquete? Tsunami? Air attack?

This is one of the reasons why building more nuclear power plants is foolish. The other reason is that for the same amount of money you could build far more generating capacity using renewable generation, and power storage too.