Originally Posted by
etudiant
Against that is the size of the facility.
Nuclear plants are pretty big, they don't explode if one punches a hole into the concrete containment shell.
To do serious damage, one would ideally hit the reactor, a pressure vessel entombed at the base of the containment.
Seen that the resultant mess would be yours to clean up, if you win, neither combatant has any interest in doing so.
To state the painfully obvious - these are not "western" nuclear facilities. The Russian/Soviet standards are not nearly so robust.