For Canada most of the country is basically unpopulated. We have enough land that we can store nuclear waste for basically forever with very minor costs.
The areas using nuclear are some of the most densely populated areas in North America, hugging the US border, and adjacent to the great lakes (in fact the generating stations are right on the lakes). Transporting the waste out is a constant risk, and there's been some rather disturbing proposals to do things like store the waste in an underground dump near Lake Huron, upstream from the water supply for the 3rd/4th biggest city in North America.
