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When I updated from 15.6 to 15.7 my nuclear reactors didn't heat up to more then around 580 degrees after some rebuilding and re piping of the heating pipes the issue solved itself and the reactors started to heat up as before and are now around 900 degrees when writing this report.

Tried rebuilding the reactors, boilers and steam turbines but that didn't help only when changing some heating pipes the reactors started to heat up normally again.

Savefile: https://drive.google.com/file/d/0B5XvUF ... sp=sharing

Heh, I just saw your post about this on Reddit, and came over here to see if I could find anyone else's reports about it.

I recall there being an issue with heat pipes relating to their build order, perhaps there are other underlying issues with their implementation.

I tried your save on my computer, and the reactors work just fine.

Windows 10
Core i7 950
12 GB DDR3
660 2GB

This should be fixed in the next version of 0.15.