Depending on the definition of "safe". Digging a long hole to the ground, towing an old to-be-demolished barge on top of Mariana's trench etc. is not that expensive.
The hard part right now is deciding on suitable ground for the tombs. Doing seismic measurements, analyzing the rock formations and especially forming the policies for burial (e.g. do we reserve the option to dig the stuff back up for use in breeders?) can take decades, but it's hardly an expensive part of the process.
The disposal isn't really an acute problem that needs to be solved today. It's not that dangerous to store the junk at warehouses while we use hundred years if necessary to research best viable options.
Nuclear power is expensive, but only if you compare it to burning hydrocarbons and hydroelectric power generation. It's still decades ahead of photovoltaic and wind turbines.
> Das Gesetz zur Beschleunigung der Rückholung radioaktiver Abfälle und der Stilllegung der Schachtanlage Asse II („Lex Asse“) wurde am 28. Februar 2013 durch den Bundestag beschlossen.[70] Die Kosten werden auf vier bis sechs Milliarden Euro geschätzt.[71] Sie sollen nicht durch die Betreiber, sondern durch den Bund getragen werden.
Translation:
> The "Nuclear Waste Retrieval Speed Up and Asse II mine closing law" was passed on February 28, 2013. The costs are expected to be between four and six billion Euro. They will be paid not by the owner, but by the federal government.
Germany built one. Turns out it wasn’t that safe. Now we have to dig up all the waste again, and put it back underground into a different mine. And this mine was our only hope, actually, because it was the only semi-stable unused salt mine left in Germany.
Now the government passed a tax "Brennelementsteuer" (Nuclear Fuel Tax) that means the owners of nuclear power plants have to pay parts, approx up to 20% of the costs for demolishing the plants, and still 0% of getting rid of the waste, this money will be gotten as a tax for using nuclear fuel.
And, with this tax, nuclear energy is now, even despite getting similar subsidies as renewables, more expensive than wind. Several large energy companies already sold their nuclear plants and switched over to wind; even the few plants in Germany that were still running after Fukushima are now not profitable anymore.
The hard part right now is deciding on suitable ground for the tombs. Doing seismic measurements, analyzing the rock formations and especially forming the policies for burial (e.g. do we reserve the option to dig the stuff back up for use in breeders?) can take decades, but it's hardly an expensive part of the process.
The disposal isn't really an acute problem that needs to be solved today. It's not that dangerous to store the junk at warehouses while we use hundred years if necessary to research best viable options.
Nuclear power is expensive, but only if you compare it to burning hydrocarbons and hydroelectric power generation. It's still decades ahead of photovoltaic and wind turbines.