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I recall there was some kind of bug with nuclear reactors in Arma, maybe it is related:
Sometimes, you couldn't build level 2 reactors when you researched the appropriate tech, but were able to build 2 or even 3 additonal once you reached tech level 3.

Something like this happened to me in my first game as GER:
I was unable to build a level 2 reactor after finishing the tech - and i am still lacking a level of nuclear reactor, although I have already finished lvl 4 tech...

Trying to find a save game.
 
Figured out what it was. The nukes automatically start building when you get 5-7 reactors, and you can glitch the game to let you do a large serial run of nuke reactors that it does not stop producing, even if the tech limits you to a certain amount. I had 12 when our game ended, and that was only because I stopped building them. I would have had 20 when we ended.

Also, on the note of nuclear sabotage, it's wayyy too easy, as I only had a 6 percent chance of doing it and I destroyed Germany's stockpile of 3 nukes in about a week.