There's one particular mine/set of generators in china that basically just burns low-grade uranium ore (the ash is more concentrated than Namibian and Nigerian

There's one particular mine/set of generators in china that basically just burns low-grade uranium ore (the ash is more concentrated than Namibian and Nigerian mines). If you exclude that one 100x is about right. For the rest, yeah. Also La Hague emits about 1/20th of a chernobyl per year. CO2/NOx/SOx/particulates from coal are still worse.