If you are willing to learn a lot of new information you will do fine. You have already had the training to deal with all kind of unusual issues at school (that, will come in handy in the nuclear world). I cross trained from an education background and have been able to survive as an HP for over 35 years.
If you get in be patient and seek out good mentors as there is nothing like gaining experience from those that have already been around the block a few times.
Regards,
Old HP