Building a nuclear plant takes time--and incredible resources. The only way Canada can get an immediate return on investment is "efficiency". There probably are enough projects that could be carried out right away to equal the productivity of a new nuclear plant that would take ten years to build.
That's assuming there is no disaster.
Here's what happened in Japan:
Since Fukushima in Japan, the other nuclear reactors have been shut down (and given funding to restart):
but court orders have prevented at least two from reopening:
And where do things stand?