disposal...fortunately, the 'GEN-IV' reactors starting to enter their construction/demonstration phases address those concerns, however the 'proofs' that will support licensing won't be available until the 2030 timeframe, so no orders will be placed until then...admittedly not optimal, but it is what it is...wouldn't surprise me to see another extension request for Diablo Canyon.
In our representative democracy, it is vitally important to our energy future that a significant majority (not all) of Americans buy into the expansion of NP, and for that to happen, those concerns need to be addressed first.