The good news is that the yellow card is for not resolving issues with the backup diesel power system, not anything to do with the reactor vessel or primary loop.
This is the right abundance of caution for the NRC to use (after all, that kind of reactor can melt down if power completely fails and cannot be maintained to sink heat), but it should be an easy fix. If anything, the yellow card was given for how long Dominion's been letting itself sit on an easy fix.
(On the other hand, the justifiably-paranoid might ask what else is wrong if they've let a maintenance issue this relatively unimportant slide...)
This is the right abundance of caution for the NRC to use (after all, that kind of reactor can melt down if power completely fails and cannot be maintained to sink heat), but it should be an easy fix. If anything, the yellow card was given for how long Dominion's been letting itself sit on an easy fix.
(On the other hand, the justifiably-paranoid might ask what else is wrong if they've let a maintenance issue this relatively unimportant slide...)