The reactor controlls are not infected, the handler for the fuel rods however is. That is all I have to say. Internet of things is a good idea, right? We can not even keep our existing stuff save!
IoT at this state is not secure at all because those kind of systems are too basic to defend theirself from basically any attack. Also vendors do not include a manual override in case something goes wrong (this is an example http://www.nytimes.com/2016/01/14/fashion/nest-thermostat-glitch-battery-dies-software-freeze.html?_r=0 ). I don't wan't to get locked in my house starving to death because someone on the internet has decided to hack my house. I imagine myself right now being like Del Spooner from I, Robot when I'll get old lol