Respawning NPC's
I recently worked through the "My First Vault" Tutorial series, on the GECK Wiki page. I did not populate it with as many NPC's as the tutorials indicated, nor fill it with very much clutter/decoration, as I am considering using it for something else and didn't want to have to un-do a lot of things...after doing the little mini-quest suggested in the tutorial I have not revisited the vault for approx. 6-7 RL days...today I "remembered" to go back to take another look and none of the NPC's have respawned. Their bodies are still laying about as they were when I went through the vault a week ago (a week in real-world time).
Is there a setting I've overlooked, or done incorrectly...I expected the NPC's to respawn after a period of time. Is there something I can change/edit to affect the timer for the respawning?
Thank you for your time and assistance.
(Edit: I am only using G.E.C.K., with the 1.5 Update, and have FallOut 3 GoTY Ver. if that matters.)