Survival Mode in Fallout 4 is being revamped, according to a Bethesda tweet. A subsequent post on Bethesda's website details all of the changes that will be implemented for players on the Survival difficulty.
As of 03/29/16, this update is available as beta on Steam.
One of the features for this updated Survival Mode, per the Bethesda post, states that fast traveling is disabled. However, there is at least one location that seem to only be accessible by fast traveling.
The Institute, after they install the relay into your Pip-Boy as part of the Institutionalized quest.
How do you visit locations that are only accessible by fast traveling while playing in the updated Survival Mode?
Best Answer
You can teleport into to the Institute from any exterior location in survival mode but you cannot teleport out to any location. You will basically be asked to teleport to the CIT ruins. On the case of faction usefulness for fast travel in survival mode, the Brotherhood is a lot better with the vertibird as they can travel from anywhere to anywhere just take a while to get there as its a physical form of transport (still way faster than on foot and safer).
Hope this helps you .