Sadly, Canadian public opinion has been poisioned against nuclear power (even nuclear power reactors that provide something like 44% of the baseline load for Ontario), so discussing this topic in a rational manner outside professional forums is probably pointless.
This is actually frightening, since nucler submarines will be the capital ships of any 21rst century Navy, replacing aircraft carriers as surely as carriers replaced the battleship. Subs can move relatively undetected anywhere on Earth and carry weapoins and equipment capable of supporting operations on land, sea and air. The Russians showed the way with large nuclear cruise missile subs like the Charlie and Oscar class, and the USN has repurposed Ohio class SSBN's to cruise missile carriers, along with most attack subs being able to carry cruise missiles as well. Landing teams of SEALs is another capability most subs can carry out, and in the future, launching and operating UAVs and UCAVs will be possible as well.
If Canada wants to be able to patrol the Arctic, or participate in operations like the one concluded in Lybia, then a robust nuclear submarine with the internal volume (or exterior carriage) for cruise missiles and like weapons along with more conventional weapons like torpedoes is a must have, otherwise we will have a very vulnerable and second rate fleet.