Okay, lets talk engineering. There are a lot of nuclear power stations in the world. A lot. And they cant run unmanned forever. Not even the best contingency plans will be able to safeguard against an end-of-the-world scenario. Once the power runs out, nuclear power plants could go critical within days. So why arent apocalyptic films all set in a barren wasteland of radiation, a bit like The Road but with the only survivors living underground? I guess thats a pretty narrow scope for storytelling. And no living characters somewhat limits plot development. So I guess well have to ignore technological realities when we get our zombie fix in future...