The only rational course for new nuclear in Ontario is to pick the Westinghouse AP1000. This would work, and be very safe. The only problem is that everybody and their dog want to build these things, and there's only one tired plant in Japan that does the forgings.
It would be cost-effective to slip a company such as this, a billion dollars to increase their forging capacity to 600 tons. Right now, they're only at 15 tons, which makes it quite a stretch! The great thing is that after Ontario, they can export to the world, and we get our money back!
Right now I paint a gloomy picture of future nuclear in Ontario, since I don't believe that the AECL design will actually work. If somebody asks me "OK, smart ass, what's your solution?", then I'm ready for them!