We already have inherently safe nuclear reactors[1] that automatically power down if the core gets too hot due to the physical properties of the fuel, without the need for an electronic control system. However, incidents such as Chernobyl, Three Mile Island and Fukushima have already tarnished nuclear in the public view, making it politically unfeasible to spend money on new reactors. This is a good summary of the situation: https://www.technologyreview.com/s/602051/fail-safe-nuclear-...
[1] https://en.wikipedia.org/wiki/Molten_salt_reactor