A quick sample of code to get the AI to build multiple SR's, just as a demo.
To install, simply paste the block of code into whatever xml document you are using.
Make sure that you enable the AI to use the state by adding the build state to the personality definition, like such...
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This code block tells the AI to build the super reactor every 5 minutes, starting at 2 minutes into the game... These values were set to test the reactor building since the normal Reactor is classed as the power source in the AI ArmyDef, changing the super reactor build heuristic to 'POWER' would only crash the game or worse, stop them from being built.