There are risks, I’ll not lie to you, but there are also a lot of misconceptions about this. Most of the time when adult chickens first see chicks, they will be curious. They will usually come over to look at them. That does not mean they are coming over to kill them, just to check them out. The chicks might go toward the adults for the same reason. It’s possible one will try to kill the chicks, practically always a hen hardly ever a rooster. That’s another popular misconception, how dangerous roosters are to chicks. Most hens won’t aggressively attack to kill, but that checking out may involve some pecking, actually part of the pecking order stuff. Even hens that aren’t out to do damage can possibly harm a chick by accident.
The way I read your post, you are talking about taking your chicks out to play, not trying to integrate them. Good for you. That will be good for the chicks. The simple answer to your problem is stay with the chicks and don’t let the adults near enough to them to cause harm. I don’t know what your conditions or set-up is like, but you should be able to figure something out, maybe lock the hens in their run.