I imagine it has something to do with the quantity of power a nuclear power plant can generate compared to a gas based power station (given equivelent time/amounts of fuel)?? But I don't really know.
Having said that, though I don't remember the name/type ofdhand and am too lazy to look it up, there are new types of power plant in development/trials that 1) physically cannot meltdown, 2) produce much less (and less hazardous) waste and 3) use a plentiful form of nuclear fuel. If/when those nuclear power plants become production ready, then the choice between nuclear and fossil fuels is an easy one. For now, though, I agree with you and don't know the answer.
