It killed me. I had to load from the previous save and let Sara do it.
But maybe that's because I wasted too much time trying to get Fawkes to go in and do it. The oaf just stood there.
The ending slides after you activate the purifier tell you you're dead, but you should then wake up after the slides stop. You will think you're dead at first.
If you died for real, then you didn't have the DLC installed properly.