The big problem with recycling spent nuclear fuel is that the required reprocessing is much worse in terms of safety than the nuclear power plants themselves. Lots of lovely, toxic, highly radioactive solutions which are practically iching to go prompt critical and ruin everyone's day. I think the only reprocessing program which managed not to be a safety train wreck is France's, and I half-suspect they might have just been better at covering up because it's so unusual (and in keeping with other aspects of their nuclear program).