One missile hit mid ships and the sensitive reactors auto scram. A conventional carrier has 8 boilers and knocking out a few the ship keeps going on 2-3 props instead of 4. Additionally there is no radio active water sloshing all over the place.
again theory. USS Yorktown at Midway went DIW after three 500 lb. bombs. She was able to get underway again then hit by two torpedo and went DIW again. Conventional ships can be seriously damaged by conventional ordnance. A large missile hit amidships on conventional carrier will probably render her DIW as 3 bombs did on Yorktown.