Hi, thanks for responding. Just out of curiosity, what did you do to make it work? I know the mod might have some trouble with name-spacing (the dangerous-radiation-clouds you mentioned earlier are named that to avoid clashes with Mushroom-Cloud, which I honestly couldn't recommend enough).
The 1kt nuke is really meant to go that far... the ground-burst 'light damage' (enough to break windows) radius is actually that huge, 1.18 km. Chunks are 32 tiles across, so the radius should be even more (~40 chunks), but the in game effects are limited, as the levels of damage were getting stupidly low, and (as justification), you are on a remote planet, so you would armour things a bit, right?
I originally did make the lakes not traversable, but soon discovered that if the player was standing where the lake was expanding to, the lake would immediately kill the player, and destroy their corpse (I can't remember, but it might even have put them in god mode...).
The lakes already do cause problems, as if drones are trying to rebuild there, they will repeatedly destroy the buildings, and remove landfill, until the lake is 'finished', hence the option to disable them.
If you have any better ideas, please tell me, this is my first mod, so I might have missed a good solution...
Thanks for the response, and hope you enjoy!