I found just this one on the open web:
Proceedings of the Standing Senate Committee on Social Affairs, Science and Technology. Issue 19 - Evidence - June 7, 2005 - Morning Meeting
Almost at the bottom, do a find in page for < grievance > and perhaps follow up with the speaker, Natalie Neault.
A search of Canadian law journals via LexisNexis < correctional service AND griev! > was fruitless. A search of Canadian news sources < correctional service of canada AND grievance! > yielded 131 results, a bunch of which I'm emailing you. You'll need to sort through them to see what's useful.