Quote (Klaria)
The Deathclaws only spawn in certain areas as everyone know, but they can not leave their spawning area, once they reach a certain radius, they will stop pursuing you and stand still, I assume Silverlan could make them invulnerable unless you enter in this zone radius, or remove the radius.
There is no radius. The reason why they have problems leaving that area is simply because the noding on atomic is terrible and they just can't find a way out.