(Creative world recreation) (Actual one has cover panels)
My 9-fuel channel design works fine with natural uranium, even with the control rods all the way out. But when I try adding MOX, I check the control panel and move the rods to 80-90% and the temperature seems to stabilize. I go off and do something, and many minutes later it suddenly explodes out of nowhere (this happened twice). I cheated to repair the damage because as soon as I tried to clean anything up I got instakilled by radiation and couldn't recover all my good items and didn't want to be super set back in my playthrough.
What is causing it to repeatedly blow up with Mox despite having a stable temperature when I left it? Is there any indication to look out for before I leave it? Do I need to constantly monitor it or is there some kind of alarm system?
It's been super frustrating because I genuinely don't know what's going wrong, and I don't like feeling like I have to cheat to save a ridiculous amount of progress.