Yes, it is something we should be concerned about, because for emergency planning purposes we should be ready for worst-case scenarios. That's what other countries such as Germany and Belgium have done since Fukushima. They've actually modelled these types of accidents and asked what they need to be ready for off-site, so that they can protect the public.
The CNSC, at hearings in 2012 and 2013, heard from hundreds of Ontarians that we need to look at these types of studies, whatever you think about the nuclear industry, to better our emergency plans. They've consistently dodged modelling a Fukushima-scale accident and done a lot of—I don't know—bafflegab to avoid actually addressing the question.
This goes back to your original question about the CNSC. It really worries me that they haven't been direct with the public about that.