Whilst working for disability bathroom companies undertaking electrical work,  I worked in both Seascale next to Sellafield in Cumbria and Theddlethorpe in Lincolnshire. 

Sellafield has the nuclear waste, Theddlethorpe is the proposed nuclear waste dump.

theddlethorpe.workinginpartnership.org.uk/

It's a long way between them without a railway into Theddlethorpe. So as a casual observer it would seem far more practical to open the new coal mine at Whitehaven, which is just up the railway line from Sellafield and when the coal has been dug out the nuclear waste could be put into the mine.

Though I can see it is not going to please a lot of people. 

Coal mines tend to be very wet, with water permeating through the rocks.  So if you chuck nuclear waste in them, there's a high risk that the radioactivity is going to show up in someone's water supply a few years layer.

only really if you are talking about soluble materials in porous packing, you are imagining this is like sugar in  a paper bag.

The usual method these days is not that at all but rather as some kind of glass or ceramic block where the chemical mobility of the radioactive atoms is then essentially nil. (you may pack the blocks in a steel drum to allow them to be moved by forklift, but that is not the main containment and can safely rot out in the first 50 years or so)
Mike

only really if you are talking about soluble materials in porous packing, you are imagining this is like sugar in  a paper bag.

The usual method these days is not that at all but rather as some kind of glass or ceramic block where the chemical mobility of the radioactive atoms is then essentially nil. (you may pack the blocks in a steel drum to allow them to be moved by forklift, but that is not the main containment and can safely rot out in the first 50 years or so)
Mike