I just ran into an issue that seems a bug to me. My nuclear power worked for a while, but now the reactor has temperature 999 degrees but it does not lose the heat. It is connected to heat pipes that are only 400 degrees, and are connected to heat exchangers that do not work now because of low temperature.

I'm not sure, but I think I may have gotten in this situation because my nuclear fuel cells were out-of-stock and perhaps the logic was wrong on my inserters and the cube was repeatedly inserted. But still, the temperature is risen and it should be used by the heat pipes, I would think?

I just notices that when the reactor is kickstarted then the pipes do connect. So perhaps this is intentional behavior? But is there a solution to fix it when it is over-heated and will no longer take any fuel?