[FT] Sa'Vasku power generators and threshold rolls

Are Sa'Vasku power generators subject to being destroyed by
threshold rolls just like other systems in addition to
the power generators destroyed for being on the line of biomass
boxes destroyed?

If power generators can be destroyed by threshold rolls, can
damage control repair these power generators?

Can damage control repair the power generators lost because
they are on a row of biomass boxes that were destroyed?

Thanks.

--Greg