When you get or see an opportunity, take it. There's always something happening. Whether its an NRC, INPO, or WANO inspection, or a plant component fails and requires rapid fixing. A more mundane item would be new employees completing walkdowns for training. It never hurts to ask if you could shadow or contribute to these items. Each experience provides valuable insight to this one of a kind industry and gets you more mentally acclimated to plant operation. They also provide good ways to network within the plant and meet new people.