DichromaticLotus

If you use automatic reactor control, yes. At 50% reactor power you get around 50% ISP. I spam coolant tanks on my engine so I can keep a high reactor power while fine tuning my maneuver.

I see, thanks for the explanation!

Sorry for the late reply a family member was suddenly sick and I had to go out of town. I have since abandoned that save file and made a new one with less mods. It fixed the **Not Found** loop problem but I'm still unable to modify heat loops even when everything is shut down. If heat loops 0-3 is used and I want to move a coolant tank from loop 0 to loop 2, it will skip loop 1-3 entirely and jump to unused loop 4. From loop 4 it can't decrease loop number and I have to go to all the way to loop 9 as it loops around to loop 0. logs: https://drive.google.com/file/d/1fQnYI9V17Td4p_nFeIJ3tnAaJnwiHdRY/view?usp=sharing

Having a bug where changing heat loops is inconsistent and scary. Also the nuclear reactor heats up when I turn it off. All radiators are on loop 0, resource converter on loop 1, and nuclear reactor on loop 2. Associated vessel is Mun Station. It's the 2nd fresh station cheated into Mun orbit because the original was made in 1.8.1 and I was unable to integrate a functioning heat loop because of the same bug. The first replacement station was "infected" because I docked a legacy 1.8.1 vessel that has a cursed nuclear engine and it broke the station's heat loop. In this 2nd one the legacy vessels that are docked doesn't have any parts that produce heat but it still broke the station. Logs: https://drive.google.com/file/d/1k1lUNviTjmfWdfWm9IReZ05eDJkV9DC-/view?usp=sharing

Didn't work for me for some reason. Probably because all the radiators are on the station and not the vessel itself. Spent months moored to the station waiting to extract the nuclear waste and it doesn't seem cool down when station is not loaded. I installed System Heat and problem was solved. Just need to retrofit the station with heat pumps.

What's the fastest way to cool down a nuclear engine?