Does it exist? I've been looking for it for quite a while now, but I can only find it for 1.7.X
Nuclear Control 2 for 1.12.2?
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Not for 1.12 yet, but for 1.10 there's this:
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- Official Post
 
Also it is named "World Control" by now.
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Are there any similar addons?
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OpenComputers can be used for control purposes, but requires programming knowledge
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Ah, I know some LUA as I used it a couple of times.
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Does the newest version of ComputerCraft 1.12.2 allow a hard wire connection with modem to link a IC2 nuclear reactor as a peripheral?
If so, I have heard of people using that API to connect a reactor and use different functions such as ".getHeat()" etc. However, with my experience in 1.7.10 I am not able to connect a reactor via modem.
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If somebody is still looking for Nuclear Control for 1.12.2 - you can find it here
There are still a lot of things to do, but all NC2 blocks/items are already done.