science

Truckloads of dangerous waste (a few lorries’ worth a year per plant), which is only dangerous if you stand close to it in the next 10,000 years or so, something that can be mitigated by how one stores it. (Keeping it under water attenuates much of the radiation, for example.) Or, alternatively, it can be reprocessed to make more reactor fuel.

So it’s less than ideal, though one has to measure the quantity of waste and the risks against the certainty of health costs of fossil fuels (which are visible in cancer statistics even when everything is working perfectly).