Dome Tech

The domes are made of transparent materials, because the material conducts energy better for the necessary shielding. It's also so that in case of failure, people won't be stuck in a dark bubble but will at least have the outside to look to for necessary sunlight.
There is shielding involved.
The dome is made of larger hexagons (octagons?) that can be pieced together and more easily repaired or even expanded.