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.
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.