At Sellafield they had problems with the seagulls, to the extent that if they shat on you you had to go and check that the poop wasn’t radioactive. Allegedly, truly vindictive types would throw sandwiches into open cabriolets so the upholstery would get coated.
Dounreay has most of its low level waste buried in bunkers, so it’s hard for wildlife to get at it. Except for the rabbits seen burrowing through the pit caps, of course.