Issue Description
Large Nuclearcraft fission reactors, with active cooling, can overflow the cooling rate value, as it can go over 65535, and NC doesn't handle that. Apparently default NC config cooling values were "recently" updated, but not sure when, so the config may need a regen. Or if the heat values were intentionally boosted, they may need to just be set to normal. If the coolers are set to half efficiency that could maintain the 'difficulty' if that was the case

Modpack version (Do not use "latest")
1.16a, with a manually updated NC to 2.12f

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Thank you for the report, I will investigate the issue.

Just an example:
Nearly overflowing:

Then with one more cooler:

The developer says it's just a GUI overflow, the Reactor should run just fine :)