ASW kit on an icebreaker (or "slushbreaker"in this case) is useless on this class of ships for technical reasons. The only adequate all season ASW platform in the arctic is another nuclear attack sub (which is why the 1987 Defence White Paper called for them). In open water conditions a CP-140 or similar maritime patrol aircraft is still the best bet. Everything else is just a sovereignty propaganda op.  There is no keeping "all foreign subs out of Canadian waters", that's a requirement that would eat the entire defence budget and still not be met. No one is "nuking" anything. MAD is still in play and no one would win. I suggest less Tom Clancy novels.