There is no opcode for that. You have to use this opcode:
| CODE |
| 0AE1: $actor = random_actor_near_point 0@ 1@ 2@ in_radius 10.0 find_next 1 pass_deads 1 //IF and SET |
There is an example on GTAG, but I can't find the topic (I can't view any topic properly).