I would think that with a few camera’s an automated security system could be used that could detect trespassers before they even jump the fence, alert a security station somewhere with the live camera video and than the reactor can be turn off instantly and police can be called to the scene. Or perhaps an automated turret or even a remote controlled kill bot?
http://www.tacticalwarfightergear.com/graphics/military-robot-1.jpg
Just saying, automated security would not be hard, it practically an electric power sub-station, it really does not need much more then a fence and cameras.
