In Factorio a nuke plant produces 40 Mw (before neighbor bonus) of heat. In Krastorio there is no neighbor bonus, but the nuke plant text says it operates at 300% efficiency. Does this mean that a Krastorio nuke plant generates 120 Mw of heat?

Yes. You can also look at the new nuclear ratios in the FAQ section.

Awesome, thanks. Great mod!

I have another nuke question. I thought I read somewhere that you had removed the neighbor bonus for reactors and replaced it with 300% efficiency, but now that I’m building a plant it’s showing a 50% neighbor bonus. Do the ratios on the FAQ take this neighbor bonus into account?

The bonus was reduced by half, but it remained. All ratios from the FAQ account this bonus.