Survival (GURPS) is one of Fallout GURPS skills. See: Fallout GURPS.
Ability to live off the land, find food and water, avoid hazards, build shelter, etc. A different Survival skill is required for each type of terrain. Roll once per day in a wilderness situation. There were three subtypes of this skill.”— Steve Jackson Games GURPS sources
With the abandonment of GURPS, Survival (GURPS) was merged into Outdoorsman.