I built a fission generator and accidently left a setting changed which damaged it, which file is the fission generator stats stored in?

C:\Users...\Appdata\Roaming\ .minecraft\config\mekanism\generators.toml
remember to open the file with notepad++ or similar

Im looking more to delete damage of a specific fission reactor in the saved worlds file, in the mean time, i can set meltdown chance to zero

Nevermind, I found that the damage goes down over time after cooling it

You'd need to use NBTExplorer or similar to view the tile entity data